For items 10-15: A study was conducted to investigate the interactions between California sheephead, macroalgae, and urchins. The output path diagram of the study is given below: kelp stipe density O A. direct sheephead biomass OB. indirect O C. spurious O D. unanalyzed urchin density crustose coralline algae For items 11-15: Identify the type of effect component that exists between each pair of variables: 12. urchin density to kelp stipe density fleshy algal cover
Q: ) What is the significance of the smaller standard deviation or Machine 2? Since Machine 2 has a…
A: Machine 1 Population mean μ1=12.4, standard deviations σ1=0.2 Machine 2 Population mean μ2=12.4,…
Q: What is the adjusted Exponential Smoothing forecast for Year 4, Q1 using alpha = 0.3 and beta = 0.5?…
A: Year Quarter Demand 1 1 105 2 150 3 93 4 121 2 1 140 2 170 3 105 4 150…
Q: If a hypothesis test in a CRD is performed at the 10% level, and the output from Excel shows a…
A: given data α = 0.10p value = 0.00552decision : we reject the null hypothesis. is decision true or…
Q: The least-squares regression equation is y=649.1x + 16,025 where y is the median income and x is the…
A: From given data regression equation is y^=649.1x+16025
Q: 11) Consider each of the following scenarios and state whether the variable in question is a…
A: A confounding variable influences both the dependent as well as the independent variable. It means…
Q: BEETLE PROBLEM A study is conducted to determine the height of a beetle which is distinctively…
A: Considering the logit model in terms of odd ratio is transformed as: lnp1-p=α+βx⇒p1-p=expα+βx The…
Q: Which value represents the variability attributable to the different factor levels or treatments?
A: From the One-Way ANOVA, the variability attributes to the different factor levels or Treatment is…
Q: Dr. Chung, a renowned dietitian, claims having a balanced breakfast increases productivity. To…
A: Solution: First we understand the what is hypothesis: Hypothesis is the statement or assertion about…
Q: 7) Define the following Type II Error Type I Error Power P-value
A: Objective of this question is that, defined the term Type 2 error Type 1 error Power P value
Q: Suppose that a random sample of 17 adults has a mean score of 67 on a standardized personality test,…
A: Givensample size(n)=17Mean(x)=67standard deviation(s)=4confidence level=95%
Q: Match the concepts mentioned in class to their respective meanings. Enter the concept number in the…
A: We have few conceptual terms and the question asks to match each term correctly to the corresponding…
Q: A simple random sample of size n = 76 is obtained from a population with μ = 60 and o=2. Does the…
A: Given : Sample size, n=76 Population mean, μ=60 Population standard deviation, σ=2
Q: = 30 The testing times for a group of college students were normally distributed with a mean of μ…
A: Given Mean=30 Standard deviations=4.7
Q: A research is conducted to analyse whether the World Cup event has disturbance on the sleep quality…
A: Let p denotes the population proportion of adults having symptoms of sleep deficiency who did not…
Q: Does 10K running time change when the runner listens to music? Nine runners were timed as they ran a…
A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…
Q: Charmaine has two ways to travel from her home in Norco to her office in Los Angeles. One is to go…
A: The question is about hypo. testing Given : Random sample of trips via S.B. freeway ( n1 ) = 12…
Q: A student was asked to find a 90% confidence interval for the proportion of students who take notes…
A: We have given that n = 86 90% confidence interval for the proportion(p) is given 0.12 < p <…
Q: Provide an appropriate response. 37) The heights (in inches) of 20 randomly selected adult males are…
A:
Q: A bag contains 7 cherry, 6 Orange, and 7 Lemon candies. You reach in and take 4 pieces of candy at…
A: A bag contains 7 cherry, 6 Orange, and 7 Lemon candies. Total number of candies is 7+6+7=20. 4…
Q: An apple farmer inspects a large random sample of his apples and finds that 20% contain excellent…
A: Given,sample proportion(p^)=0.20margin of error(E)=0.01
Q: 2. We have a random sample of 500 U.S. adults who are questioned regarding their politica…
A: Chi square test is used to measure whether there exist significant relationship between two…
Q: A newspaper article reported that people spend a mean of 7 hours per day watching TV, with a…
A: given data, normal distributionμ=7σ=2.1 top 10% of the population spent most timefor watching tv
Q: 12) The association between cellular telephone use and the risk of brain cancer was inve…
A: The association between cellular telephone use and the risk of brain cancer was investigated in a…
Q: Suppose that X, Y, and Z are jointly distributed random variables, that is, they are defined on the…
A: As per our guidelines we are suppose to answer onlyone question kindly post the remaining questions…
Q: A survey of shopping habits found the percentage of respondents that use technology for shopping as…
A: Given in the question:
Q: Cost of Braces The average cost for teeth straightening with metal braces is approximately $5416. A…
A: Given data: Significance level= 0.025 Population mean = 5416 Sample mean = 5228 Sample standard…
Q: Thanks to an initiative to recruit top students, an administrator at a college claims that this…
A: given data,claim: μ>110n=11x¯=112s=15α=0.05one- tailed test
Q: Jessica counts how many customers have come into her restaurant for the past 30 days. The table…
A: frequency distribution
Q: what type of hypothesis test is this
A: We have the given correct hypothesis is Ho: p1 = p2, Ha: p1 < p2
Q: Question 6 The duration of video screen time on the iPhone 13 is normally distributed with a mean of…
A:
Q: Compute the linear correlation coefficient between the two variables and determine whether a linear…
A: We have given that, The data set are, X:- 6, 7, 14, 11, 12, 19, 7, 5, 15 Y:- 26, 28, 73, 57, 60,…
Q: Out of a class of 30 students, there are 16 students who study Latin, 21 who study German, and 7 who…
A:
Q: 3.) The World Bank collects information on the life expectancy of a person in each country ("Life…
A: Given: The data on Life Expectancy of a person and Fertility Rate per woman for 24 randomly selected…
Q: Use the linear regression models above to answer this question. There are two break-even points.…
A: Linear regression, p=ax+b x p x^2 p^2 x*p 2910 1450 8468100 2102500 4219500 3415 1275…
Q: Assume that the following data represent baseball batting averages (multiplied by 1000) for a random…
A: Solution-: Make a frequency table showing class limits, class boundaries, midpoints and frequency.…
Q: Suppose you wish to find out the answer to the age-old question, "Do people prefer Cola 1 or Cola…
A:
Q: Suppose the following table was generated from a sample of 20 CEOs relating annual salary to years…
A: Regression equation is used to predict the values. If it has only one independent variable, then it…
Q: Problem C: Suppose that a sample of 200 respondents were asked about their preference on vacation…
A: Given The data is as follows: Beaches Mountains Men 207 282 Women 231 242
Q: The following data was obtained from a balanced CRD: number of treatments number of observation per…
A: The given data is: number of treatments,m= 5 number of observations per treatment,k= 32…
Q: For a Chi-Square distribution, with n= 15 and 95% Confidence level, Xright and and Xleft are O…
A: given data n=15df=n-1=15-1=14CI=0.95α=1-0.95=0.05we have to find out the chi squre critical values…
Q: Classify the following statement as an example of classical probability, empirical probability, or…
A:
Q: Question 2
A: 2. Given Sample size, n=12 α=0.05 The data is as follows: 104.3, 89.6, 89.9, 95.6, 95.2, 90.0, 98.8,…
Q: If you were told that four students from a class of twenty were questioned for a poll about study…
A: Cluster sampling is a probability sampling method in which you divide a population into clusters,…
Q: 30 tickets are sold and three prizes are to be awarded, find the probability that one person will…
A: Given Total tickets=30
Q: A sample of size 49 is drawn from a population where the population standard deviation is o = 4.8…
A: given data n = 49σ = 4.8x¯ = 1095 % ci for μ.Z = 1.96
Q: Speeding Tickets A motorist claims that the South Boro Police issue an average of 60 speeding…
A: The given claim is that the South Boro Police issue an average of 60 speeding tickets per day.
Q: Complete the following instructions: i. Identify the independent and dependent variables. ii.…
A: 1) Type data in excel No. of bottles Price ($) 44 25 18 60 93 15 65 30 82 20 56 40…
Q: a. Test at 5% level of significance whether sex is indeed associated with whether or not the…
A: Note: Hi! Thank you for the question. As you have posted multiple parts, according to our policy, we…
Q: Determining whether two samples are independent or paired a... A purchasing manager for a large…
A: Please like my answer..... It supports me a lot..?
Q: If n=310 and X = 248, to construct a 90% confidence interval, you need to use which one of the…
A: Given that n=310 and X=248. Here we want to construct a 90% confidence interval.
Step by step
Solved in 2 steps with 1 images
- Following are measurements of soil concentrations (in mg /kg) of chromium (Cr) and nickel (Ni) at20 sites in the area of Cleveland, Ohio. These data are taken from the article "Variation in NorthAmerican Regulatory Guidance for Heavy Metal Surface Soil Contamination at Commercial andIndustrial Sites" (A. Jennings and J. Ma, J. Environment Eng, 2007:587-609). Cr: 260 19 36 247 263 319 317 277 319 264 23 29 61 119 33 281 21 35 64 30Ni: 435 377 359 53 38 38 54 188 397 33 92 490 28 35 799 347 321 32 74 508 (a) Construct a histogram for each set of concentrations. (b) Find the 1st, 2nd and 3rd quartiles for the Cr concentrations (c) Find the 1st, 2nd and 3rd quartiles for the Ni concentrations.Following are measurements of soil concentrations (in mg /kg) of chromium (Cr) and nickel (Ni) at20 sites in the area of Cleveland, Ohio. These data are taken from the article "Variation in NorthAmerican Regulatory Guidance for Heavy Metal Surface Soil Contamination at Commercial andIndustrial Sites" (A. Jennings and J. Ma, J. Environment Eng, 2007:587-609).Cr: 260 19 36 247 263 319 317 277 319 264 23 29 61 119 33 281 21 35 64 30Ni: 435 377 359 53 38 38 54 188 397 33 92 490 28 35 799 347 321 32 74 508 (d) Use these to construct comparative boxplots for the two sets of concentrations. (e) Using the boxplots, what differences can be seen between the two sets of concentrations?For a table of national information regarding a specific country, it is found that the correlation with Internet use is 0.545 for GDP, 0.734 for cellular-phone use, 0.664 for literacy, −0.893 for fertility, and 0.854 for CO2 emissions. Which variable has the weakest linear association with Internet use? a. GDP has the weakest linear association with Internet use. b. Cellular-phone use has the weakest linear association with Internet use. c. Fertility has the weakest linear association with Internet use. d. CO2 emissions has the weakest linear association with Internet use. e. Literacy has the weakest linear association with Internet use.
- Consider a cohort study to compare the mortality rate of myocardial infarction (MI) in men with sedentary work (exposed group) to men with physically active work (unexposed). If in the exposed, there were 36,000 person (man) years of observation and 126 deaths whereas the unexposed had 24,000 man-years of observation and 44 deaths. Compute the following a) Mortality rate in each cohort? b) What is the relative risk of dying, comparing these 2 groups? c) What is the attributable risk of sedentary work? d) What is the attributable benefit of physical activity? e) If we assume that MI is associated with the mortality in this cohort (causality), what proportion of the disease in the higher group is potentially preventable?Cell Phone Radiation Listed below are the measured radiation absorption rates (in W/kg) corresponding to these cell phones: iPhone 5S, BlackBerry Z30, Sanyo Vero, Optimus V, Droid Razr, Nokia N97, Samsung Vibrant, Sony Z750a, Kyocera Kona, LG G2, and Virgin Mobile Supreme. The data are from the Federal Communications Commission. If one of each model of cell phone is measured for radiation and the results are used to find the measures of variation, are the results typical of the population of cell phones that are in use?Given the data in the following table for wave-solderingnonconformities, determine if there are any differencesbetween the two processes. Based on variousa levels, would you recommend a change to the proposedprocess?
- Suppose these data show the number of gallons of gasoline sold by a gasoline distributor in Bennington, Vermont, over the past 12 weeks. Week Sales (1,000sof gallons) 1 18 2 22 3 20 4 24 5 19 6 17 7 22 8 20 9 24 10 22 11 17 12 24 (a) Using a weight of 1 2 for the most recent observation, 1 3 for the second most recent observation, and 1 6 for third most recent observation, compute a three-week weighted moving average for the time series. (Round your answers to two decimal places.) Week Time SeriesValue Weighted MovingAverage Forecast 1 18 2 22 3 20 4 24 5 19 6 17 7 22 8 20 9 24 10 22 11 17 12 24 (b) Compute the MSE for the weighted moving average in part (a). MSE = Do you prefer this weighted moving average to the unweighted moving average? The MSE for the unweighted moving average is 10.91. The unweighted moving average is preferred because it has a larger…MR In Dave Eggers’ novel The Circle, a mysteri-ous technology company has developed a strangely data-driven work environment in which employees are assigned a performance score that seems to be the product of factors in their social activities and environment, such as the extent of their engagement in work community and the number of times they post on the company’s social media site. Using the fictional data below, compute r and r2 for each com-bination of two variables from this novel and test the correlations for their significance. Write a paragraph interpreting the relationships between these vari-ables, and what they might mean for the companyA glass manufacturing company wanted to investigate the effect of breakoff pressure and stopper height on the percentage of breaking off chips. The results are in the accompanying table. Complete parts (a) through (e). a. At the 0.01 level of significance is there an interaction between the breakoff pressure and the stopper height? b. is there an effect due to the breakoff pressure? c. is there an effect due to the stopper height? d. Plot the percentage breakoff for each breakoff pressure for each stopper height. e. Discuss the results of (a) through (d).
- Question 4: The following data includes the year, make, model, mileage (in thousands of miles) and asking price (in US dollars) for each of 13 used Honda Odyssey minivans. The data was collected from the Web site of the Seattle P-I on April 25, 2005. year make model mileage price 2004 Honda Odyssey EXL 20 26900 2004 Honda Odyssey EX 21 23000 2002 Honda Odyssey 33 17500 2002 Honda Odyssey 41 18999 2001 Honda Odyssey EX 43 17200 2001 Honda Odyssey EX 67 18995 2000 Honda Odyssey LX 46 13900 2000 Honda Odyssey EX 72 15250 2000 Honda Odyssey EX 82 13200 2000 Honda Odyssey 99 11000 1999 Honda Odyssey 71 13900 1998 Honda Odyssey 85 8350 1995 Honda Odyssey EX 100 5800 Compute the correlation between age (in years) and mileage for these minivans. (Assume the correlation conditions have been satisfied and round your answer to the nearest 0.001.)Which of the scatter diagrams below suggests a strong positive linear relationship between the x and y variables?Question 4 a The researcher is concerned that older persons may not be knowledgeable of the COFLU-20. Assuch, he is interested in investigating the association between the age of the respondents and theirknowledge level. Table 2 below shows the knowledge level of respondents, by age group.Table 2Age Group Knowledge Level TotalPoor Satisfactory Good18 - 25 33 16 13 6226 - 34 30 18 12 6035 - 44 29 14 12 5545 - 54 36 16 18 7055 - 75 17 14 22 53Total 145 78 77 300 Conduct a test, at the 5% level of significance, to determine whether the data provided sufficientevidence to conclude that an association exists between age group and knowledge level. (i) State the hypotheses to be tested:H0:H1: Calculate:(ii) state the degrees of freedom for this test (iii) the p-value for this test, given that the chi-square test statistic, x2, is 11.029. (iv) state the conclusion for the test. Give reason for your answer.