1. The water quality of the Sarawak River system was tested for heavy metal contamination. The average heavy metal concentration from a sample of 49 different locations is 3 grams per milliliter with a standard deviation of 0.5. Construct a 99% confidence interval for the mean heavy metal concentration.

Q: Find the range for the given data set, 26,11,35,38,49,68,73,56,32,48

A: From the provided information, The data values are as follow: 26,11,35,38,49,68,73,56,32,48

Q: Does the interval provide convincing evidence that those 75 and older read more than those 15 to 19?

A: The most recent American Time Use Survey found that many Americans barely spend any time reading for…

Q: Systolic blood pressure levels above 120 mm Hg are considered to be high. For the 100 systolic blood…

A: We have given thatMean(µ) = 120Sample size (n) = 100Sample mean (x̅) = 120.46000Standard deviations…

Q: to the binomial dist test two-tailed, left-tailed, or right-tailed? eft-tailed test tight tailed…

A: Sample size n =294 Favorable cases x =27 Sample proportion p^=x/n  =27/294 =0.0918

Q: Q6- Answer correctly and read the question correctly, If the question is done correctly, I will…

A: Sample size, n=49 Population mean, μ=210 Sample mean, x¯=206 Sample standard deviation, s=14

Q: Find a 95% confidence interval for the population standard deviation o.

A: The football coach randomly selected ten players and timed how long each player took to perform a…

Q: Consider a drug that is used to help prevent blood clots in certain patients. In clinical trials,…

A: Given n = 5762 x = 165

Q: a. Cost = $ c. Profit = $ b. Expenses = $ d. Selling Price = $

A: a. Cost = Selling Price + Discount Selling Price = $170 Discount = 10% of $170 = 0.10 x $170 = $17…

Q: The null and alternative hypotheses are: Ho: P₁ P₂ 0 H₁: P₁-P₂0 A sample of 340 observations from…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub- parts for…

Q: Find the range for the given data set, 34,23,56,73,82,19,22,43,17,33

A: Answer: From the given data, 34,23,56,73,82,19,22,43,17,33 Sample size(n) = 10

Q: Data collected at Tornonto Pearson International Airport suggests that an exponential distribution…

A: mean value 2.74 hours the rate parameter of the distribution is λ=12.74=0.3650

Q: Refer to the data set in the accompanying table. Assume that the paired sample data is a simple…

A: Given  The weights of discarded paper and plastic were given

Q: Sample is independent and random, left tailed, and 80% confidence interval. X1=16, n1=70, x2=20,…

A: First sample: Number of successes x1=16 Sample size n1=70 Sample proportion p^1=0.229   Second…

Q: a. How many ways are there to pass out 13 cards to each of the two players? b. What is the…

A: Suppose that a deck of 52 cards contains 26 red cards and 26 black cards (and assume the red cards…

Q: X 1.42 4.22 9.16 7.92 9.59 Y -0.31 8.86 26.03 21.68 27.96 Find estimates for the regression model yi…

A: Find estimates for the regression model yi Bo+ B₁xi + B2x+ε; where = N(0,02). Performing regression…

Q: An education researcher claims that 59% of college students work year-round. In a random sample of…

A: The formula of z test statistic is given by              z=p^-PP(1-P)nHere,  p^=estimated proportion…

Q: Use the accompanying 200 Los Angeles commute times to test the claim that the mean Los Angeles…

A: The given data is as follows, 25 30 15 15 15 45 35 20 90 10 30 10 141 30 60 30 5 60 25…

Q: A factory that manufactures screws is performing a quality control experiment. Each object should…

A: claim : μ≤12n = 56x¯ = 11.91σ = 0.18

Q: ard deviation rtion of vari

A: find total valriance and using total variance find eigen value

Q: Suppose that X is a normally distributed with a mean 36 and standard deviation is 8 find the given…

A: normal distribution μ = 36σ = 8 P(x<35) = ?

Q: For several years, evidence had been mounting that folic acid reduces major birth defects. In a…

A: The CI given range of values in which the population parameter lies.

Q: Forty-three examinees took an examination to test their fitness to supervise the production in an…

A: First we enter the given data set in excel sheet then To calculate 70th percentile in excel, we use:…

Q: Calculate r2 2. Interpret r2 in the context of this research. How large is this effect (small,…

A: Pnum Pre-treatment Post-treatment 1 17 15 2 14 15 3 17 12 4 13 7 5 19 11 6 17 15 7 13…

Q: Write up your results as you would see them in a research paper from the table attached in images .…

A: Mean explains the average observation of the data set. Standard deviation explains the spread of the…

Q: Find the probability of x less than or equal to 2. X P(x) 0 0.12 1 0.67 2 0.19 3 0.02

A: here we have to find out the probability of X is less than or equal to 2 =?

Q: 3. Consider the following process, Xt = 0.7Xt-1-0.1Xt-2+Zt +20Zt-1-0² Z₁-2, where {Z} is a white…

A: (a) To check if {Xt} is stationary, we need to check if its mean and autocovariance are…

Q: Question 4 Say a study estimates that 65% of a population believes in the importance of mathematics.…

A: p^ = 65%E = 3.5%95% ci  = ?

Q: Using a standard normal distribution. Find the probability of getting a value between 1.10 and 1.50.…

A: The chance of an event happening is calculated using the probability measure. If the distribution…

Q: A type of battery-operated led lights has a known mean lifetime 8 hrs with standard deviation 0.3.…

A: Answer: From the given data, Mean (μ) = 8 Standard deviation(σ) = 0.3 X follows normal…

Q: Here is a bivariate data set. X y 4553885 45 52 MENGES 7 17 54 40 49 11 51 57 38 Find the…

A: We have given that,  X :- 45, 48, 55, 52, 49, 51, 45 Y:- 7, 17, 54, 40, 11, 57, 38

Q: Researchers were interested in better understanding how autistic children see and understand the…

A: Given the bar graph for a study about blaming the victim as

Q: What is the null hypothesis? What is the Test Statistic? What is the p-value of the test? What is…

A: A person claims to have extra sensory powers.  A single card is drawn (with replacement) at random…

Q: Find the expected value of the following probability distribution X 2 4 6 8 P(X) 0.2 0.3…

A: Answer: Given probability distribution is, X              2    4    6    8 P(X=x)   0.2  0.3  0.4…

Q: ed States. Assume that a simple random sample has been selected. Use a 0.10 significance level to…

A: x x2 3.04 9.2416 6.53 42.6409 5.96 35.5216 5.51 30.3601 20.46 418.6116 7.46 55.6516 12…

Q: Consider a sample of 49 football games, where 28 of them were won by the home team. Use a 0.10…

A: Sample size n=49 Number of successes x=28 Significance level α=0.10 Claim: The probability that the…

Q: The researcher wants to calculate the correlation between a person's gender and whether he or she…

A: Ans : The researcher data is as follows     x y 0 0 0 0 0…

Q: b) Run an ANOVA test using the statistical software package of your choice to compare solvability of…

A: Let us assume alpha=0.05 that is level of significance is 0.05 Here I have used R code to run the…

Q: The variance statistic is an unbiased estimator of the population variance.

A: here  ,  suppose population variance is σ2 sample variance is s2

Q: In a study of 778 randomly selected medical malpractice lawsuits, it was found that 486 of them were…

A: Given that Number of randomly selected malpractice lawsuits (n) = 778 Number of lawsuits dropped or…

Q: b) Perform a two-way ANOVA to investigate the effect of State and Subject on exam marks and write…

A: Two-way ANOVA can be obtained by using excel. Procedure: Enter the data into excel. Click on…

Q: K Assume that you plan to use a significance level of a = 0.05 to test the claim that p₁ = P2. Use…

A: given data n1 = 100x1  = 38n2  = 100x2 = 40α = 0.05claim : p1 = p2p^1 = x1n1 = 38100 = 0.38p^2 =…

Q: An airline estimates the average weight of a passenger to be 185 pounds, including luggage. Assume…

A: Population mean, μ=185 Population sd, σ=40.0

Q: a normal population with a standard deviation of 10. The sample mean is 48. Determine the 95%…

A: We have given that,  Sample mean (x̄) = 48, Population standard deviation (σ) = 10 and sample size…

Q: A pipes manufacturer makes pipes with a length that is supposed to be 11 inches. A quality control…

A: The question is about hypo. testing Given : Popl. mean length of pipe ( μ ) = 11 inches Randomly…

Q: In a survey of 2570 adults in a recent year, 1383 say they have made a New Year's resolution.…

A: The question is about confidence interval Given : No. of adults under survey ( n ) = 2570 No. of…

Q: baseball team claims that the mean length of its games is less than 1.4 hours. State Ho and H, in…

A: The claim is that the mean length of a basketball game is less than 1.4 hours.

Q: Assuming a random sample from a large population, for which of the following null hypotheses and…

A: The population proportion of successes is p.

Q: 2. From the data in the file Forecast, calculate the forecasts using naïve method, average of all…

A: Given the time series data as Week Time Series Value 1 100 2 200 3 320 4 250 5 350 6…

Q: What type of variable is "drive an American-made automobile, or not? OA. Discrete B. Qualitative…

A: Given that Variable is " drive an American-made automobile , or not " Variables : It is a…

Q: what is the p-value

A: According to the given information in this question We need to identify the p value from the given…