Find the sensitivity and the specificity
Q: Question A test is made of Ho: μ=18 versus H₁: μ‡18. A sample of size n=53 is drawn, and x=20. The…
A: According to the given information in this question We need to solve three subparts
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Q: A type Il error is when you fail to reject the null hypothesis, but the null hypothesis is actually…
A: Given, σ=2, n=25 Null hypothesis : μ=5.1 Alternate hypothesis : μ>5.1 Significance level=0.05
Q: A smart phone manufacturer is interested in constructing a 99% confidence interval for the…
A: Givenx=86sample size(n)=1594p^=xn=861594=0.0540confidence level=99%
Q: 7.64 Historically, 93% of the deliveries of an overnight mail service arrive before 10:30 the…
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Q: We learned that there are 4 items by which we characterize a distribution in statistics. Which of…
A: Given : Four terms : a. Central tendency b. Homogeneity c. Skewness d. Kurtosis
Q: How did you (1) get the x-table number (please show step by step without taking short-cuts. (2) how…
A: From the given information, it can be written as P33<X<43=0.40. Note that Z=X-μσ. Let us…
Q: Pay Your bills: A company audit showed that of 638 bills that were sent out, 451 were paid on time,…
A: given; a company audit showed that of 638 bills that were sent out, number of bills Paid on…
Q: What is the probability of rolling a sum of 99 on a standard pair of six-sided dice? Express your…
A: All possible outcomes when rolling a standard pair of six sided dice are;…
Q: Q5. The sampling distribution of mean is the hypothetical distribution of means from all Possible…
A: Here we have to check whether given statement is true or false "The sampling distribution of mean…
Q: Not yet answered Marked out of 3.00 Complete the table below: Flag question Weight (in kg) 40-44…
A: As per our guidelines we are supposed to answer only one question per post so i am solving first…
Q: Out of 350350 applicants for a job, 162162 are female and 5656 are female and have a graduate…
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Q: 4.16 Age at first marriage, Part I: The National Survey of Family Growth conducted by the Centers…
A: Given Information: Sample size n=5534 Sample mean x¯=23.3 Population standard deviation σ=4.7
Q: Q2. The sampling distribution of means tends toward Normality only when the underlying populations…
A: Since we know that the central limit theorem states that the distribution of sample…
Q: Currently Samsung ships 22.6 percent of the organic light-emitting diode (OLED) displays in the…
A: Since you have posted a question with multiple subparts, we will solve first three subparts for you.…
Q: The mean weight of all Goliath grouper caught on the Treasure coast is 428 pounds, with a standard…
A: From the provided information, Mean (µ) = 428 Standard deviation (σ) = 59
Q: In 1977, men who were under 50 years old had a mean weight of 175 pounds, with a standard deviation…
A: Given: mean(μ)=175standard deviation(σ)=18
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Q: What is the sum of squared deviations (SS) of the data set (N=5) as shown below? DATA: 7, 13, 5, 9,…
A: Data given 7,13,5,9,16 N=5
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Q: Assume that the weights of all packages of a certain brand of cookies are normally distrib- uted…
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Q: Does this statement accurately represent Type I error? Rejecting the Ho after a test statistic…
A: Given that P value = 0.085 ,α=0.05.
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A: Assume that quality is defined as x and easiness is defined as y.
Q: Singles and Doubles Winning Percentage The following graph shows the winning percentages in singles…
A: Correlation: If the scatter plot shows a pattern of upward or downward straight line, it means that…
Q: state are µ=$13,525 and o-$4,180, respectively. Suppose random samples of 100 are drawn from the…
A: A random sample of size 100 is drawn; n=100 The mean and standard deviation of vehicles is…
Q: Let the joint density of random variables x and y be given by the following: fx,y(x,y) = 0.158(x +…
A: As per the guidelines, solving first question when multiple questions are posted. Kindly re-post the…
Q: Question 1: A manufacturer receives a shipment of 275 laptop computers of which 24 are defective. To…
A: Given: 24 out of 275 laptop computers are defective. 8 computers are randomly selected. Let X…
Q: The amount of annual snowfall in a certain mountain range is normally distributed with a mean of 70…
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Q: 82. Σιχλμα = n-1 Vs 82. ΣΧΩ ΣΧJ2 ΣΧΙΣ ο 0-1 1
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Q: The table gives the cumulative sales of iPods since their introduction. Cumulative iPod Sales Year…
A: Given data: Year Sales (million iPods) 2003 0.52 2004 7.436 2005 28.133 2006 68.842…
Q: Use this table for critical value for correlation coefficients. Critical Values for Correlation…
A: From the provided information, Sample size (n) = 15 Level of significance (α) = 0.01
Q: 7) At 9AM on a Monday, five Starbucks stores are chosen and all customers are asked to participate…
A: Answer:
Q: What conditions are necessary in order to use the dependent samples t-test for the mean of the…
A: Necessary conditions for dependent samples in t-test, and for the difference in the means of two…
Q: 9. When conducting a hypothesis test, a negative test statistic means that A. the P-value will be…
A: “Since you have posted multiple questions, we will solve first question for you. To get the…
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Q: a) You accept 55 sub-assemblies for evaluation. What is the probability that you have to evaluate at…
A: Given: The probability of defective item, p is 0.24
Q: obability that two mar
A: Combinations: This is a counting principle that allows to select r number of outcomes from a…
Q: hin 1 Distance o
A: Consumption of cigarette sticks for 30 Participants 4 10 4 7 8 7 8 7 9 3 6 2 3 9 9 4 10…
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Q: A The regression equation is Y = i + i
A: Use the Excel and Perform the Regression. Followings are the Steps to perform the Regression 1) Open…
Q: 13. In a survey about the safety of air travel, 69% of the 1044 surveyed from the United States said…
A: Given : In a survey about of air travel ; 69% of the 1044 surveyed form U.S said that they consider…
Q: Which of the following plots is most useful for de O Box and whiskers plot O Frequency polygon O…
A: It is given that the statement about to the plot. Here, need to find out the correct choice for the…
Q: A study was performed on 64 female college athletes. Researchers collected data on each female…
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Q: Your claim results in the following alternative hypothesis: Ha : p << 15% which you test at a…
A: Given that Claim : The proportion is less than 15% Alternative hypothesis Ha : p < 15% Level of…
Q: Find the z-score that cuts off 35% in the tail on the right. (Hint: if you can’t find that EXACT…
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Q: Statistical Laboratory question Using RStudio ONLY to answer the question A new employee has a…
A: Let, 5 Health Care plans be h1 ,h2 ,h3 ,h4 ,h5 . 3 retirement plans be r1 ,r2 ,r3 . 2 different…
Q: The ages of a group of 159 randomly selected adult females have a standard deviation of 17.8 years.…
A: Given that σ =17.8 , M.E =0.5 ,alpha= 0.01 n = ?
Q: Select the best response. We take a simple random sample (SRS) from a population to study the effect…
A: Design of experiment
Q: The variance is equal to: Is The data below represents the ages of a sample of individuals who were…
A: Given data is 11,3,15,22,26,28,15,11,6,11,4,22,5sample size(n)=13
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- It is believed that a sweetener called xylitol helps prevent ear infections. In a randomized experiment, 165 children took a placebo and 68 of them got ear infections. Another sample of 159 children took xylitol and 46 of them got ear infections. The scientists believe that the proportion of ear infections in the placebo group will be greater than the xylitol group. Test this hypothesis at α = 0.025.. A taxi company has been using Brand A tires, and the distribution of kilometers to wear-out has been found to be approximately normal with mean =114,000 and σ = 11,600. Now it tries 12 tires of Brand B and finds a sample mean 117,200. Test at the 5% level of significance to see whether there is a significant difference (positive or negative) in kilometers to wear-out between Brand A and Brand B. In the problem above, if the true kilometers to wear-out is 114,000, what is the 95% confidence interval for sample means? First show how to get the critical z values.A researcher randomly selected a sample of n = 500 individuals from a population with µ = 120 and administered an experimental treatment to the sample. What the researcher should expect if the treatment has no significant effect?
- A nutrition store in the mall is selling “Memory Booster,” which is a concoction of herbs and minerals that is intended to improve memory performance, but there is no good reason to think it couldn't possibly do the opposite. To test the effectiveness of the herbal mix, a researcher obtains a sample of 8 participants and asks each person to take the suggested dosage each day for 4 weeks. At the end of the 4-week period, each individual takes a standardized memory test. In the general population, the standardized test is known to have a mean of μ = 7. The scores for the 8 participants are 12, 11, 13, 15, 8, 11, 13, 15 (Set the significance level a = .05)A random sample of 100 freshman showed 6 had satisfed the university mathematics requirement and a second random sample of 50 sophomores showed that 13 had satisfied the university mathematics requirement. Enter answers below rounded to three decimal places. (a) The relative risk of having satisfied the university mathematics requirement for sophomores as compared to freshmen is (b) The increased risk of having satisfied the university mathematics requirement for sophomores as compared to freshmen isThe NAEP considers that a national average of 283 is an acceptable performance. Using α = .05, run a two-tail t-test for one sample to test Ho: µ=283 for the 2019 scores. Report the t-obt, df, and p-values. Would you reject the null hypothesis that the 2019 scores come from a population with average 283? If this is the case, does it come from a population from larger or smaller average?
- A nationwide study of undergraduate students reported that the mean number of drinks consumed per week during the spring semester is 7.96. The mean number of drinks consumed per week at USC is 7.64 (s.d.=2.55, N=412 Health services is concerned that USC students are consuming significantly more alcohol per week than the national average. Using an alpha level of .05, Is there sufficient evidence to be concerned? Be sure to select the correct critical value for the alternative hypothesis, and then use this evidence to make your conclusionA survey of 90 recently delivered women on the rolls of a county welfare department revealed that 27 had a history of intrapartum or postpartum infection. Can we conclude that the population proportion with a history of intrapartum or postpartum infection is significantly less than or equal to 0.25? Let alpha = 0.05.Rosner analyzed data from children who lived near a lead smelter (which is a facility that uses extreme heat to extract the metal lead from lead ore) in El Paso, Texas, and reported that out of 124 children studied, 23 developed colic (which is a pattern of fussiness and crying for no apparent reason). Suppose that in the state of Taxes in general at the time (early 1980s), the rate of colic in children was 16.0%. Follow the steps for testing whether the proportion of children developing clico was significantly different for the 124 children living near the lead smelter than for Taxes children in general (16%). Use alpha level of 0.03 a. Identify the null hypothesis for this statistical test. b. Identify the alternative hypotheses for this statistical test. c. Explain: Why should this be a two-tailed test, the way I have described it? d. calculate the sample proportion p̂, rounded to three decimal places. e. Calculate the appropriate test statistic, show all work. f. Based on…
- A random sample of 50 COS students contained 13 that owned an iPhone. A random sample of 200 Fresno State students contained 70 that owned an iPhone. Use these data to test the claim that the proportion of COS students who own an iPhone is the same as the proportion of Fresno State students who own an iPhone at the 0.05 level of significance.The director of an obesity clinic in a large northwestern city believes that drinking soft drinks contribute to obesity in children. To determine whether a relationship exists between these two variables, she conducts the following pilot study. Eight- 12-year-old male volunteers are randomly selected from children attending a local junior high school. Parents of the children are asked to monitor the number of soft drinks consumed by their child over a one week period. The children are weighed at the end of the week and their weights converted into body mass index (BMI) values. The BMI is a common index used to measure obesity and takes into account both height and weight. An individual is considered obese if they have a BMI value 30. The following data or collected: child. # of soft drinks consumed BMI 1 3 20 2 1 18 3…A major credit card company is interested in the proportion of individuals who use a competitor’s credit card. Their null hypothesis is H0: p=0.65H0: p=0.65, and based on a sample they find a sample proportion of 0.70 and a pp-value of 0.053. Is there convincing statistical evidence at the 0.05 level of significance that the true proportion of individuals who use the competitor’s card is actually greater than 0.65 ?