Why do I (your professor) not use the pooled proportions when testing for zero difference?   A) Because there is no such thing    B) Because I think it is an unnecessary statistical power grab based on a false premise    C) Because it does not allow you to perform right tail tests

Q: A marketing researcher is hired by a corporation to conduct a study and estimate the population mean…

A: It is required to determine whether the researcher has sufficient funds to conduct the study.

Q: c. The p-value = 0.0101 x (Please show your answer to 4 decimal p

A: Test statistic t = -2.813Null and alternate hypothesisH0:μ1=μ2H1:μ1≠μ2

Q: Catherine Chao, Director of Marketing Research, is evaluating consumer acceptance of alternative…

A:

Q: Let p be the population proportion for the following condition. Find the point estimates for p and…

A: The given data is as follows:Sample size, Number of adults who were not confident that the food…

Q: d) Construct a 90% confidence interval for the typical property tax on a single-family home in…

A: Given,data about the property tax for a random sample of 40 members.The 90% confidence interval is…

Q: Supplier claims that they are 95% confident that their products will be in the interval of 20.45 to…

A: Confidence interval of Supplier claims = 20.45 to 21.05The calculated confidence interval of the…

Q: There are four different classes one can take as an elective. The students ranks the four in order…

A: There are four different classes one can take as an elective.The students rank the four in order of…

Q: e the normal distribution of SAT critical reading scores for which the mean 506 and the standard…

A: X~N( μ , ?)μ=506    , ?=125Z-score =( x - μ )/?

Q: You have a bag of 8 colored marbles. Of these 8 marbles, 4 are red and 4 are blue? What is the…

A: There are 8 marbles.Out of these, 4 are blue and 4 are red. The selection of blue marble is…

Q: A gear has been designed to have a diameter of 3 inches. The standard deviation of the process is…

A: We are asked to answer whether the process is under statistical control or not by observing the…

Q: The number of raisins in a randomly chosen Jamaican spice bun can be modeled as a random variable…

A: Here, we have given that the two questions, one from the Poisson distribution and the other from the…

Q: An advertising firm wanting to target people with strong desires for success conducted a study to…

A: An advertising firm wanting to target people with strong desires for success conducted a study to…

Q: In a sample of 61 households, one house is worth $2,500,000. Half of the rest are worth $280,000,…

A: A sample of 61 is taken.One house is worth $25,00,000.Half of the rest ( 30 ) are worth $2,80,000All…

Q: The following is data from persons who recidivated. The researcher wants to know if indi data in the…

A: p1^=0.33,p2^=0.38,N1=150,N2=110,α=5

Q: A sample of 135 is drawn from a population with a proportion equal to 0.58. Complete parts a)…

A: A sample of 135 is drawn from a population with a proportion equal to 0.58.

Q: Mason is conducting a study on the effect of computer-based training on the math ability of…

A: It is given that randomly assigns one group of students to use a computer-based training method and…

Q: (b) Test for whether or not the mean CO is significantly different in the two types of working…

A: The formula of test statistic is,

Q: e. Based on this, we should Select an answer f. Thus, the final conclusion is that ... the null…

A: Let p1 and p2 be the two population proportions for Republicans and Democrats respectively.Given…

Q: For a standard normal distribution, find: P(Z > c) = 0.3742 Find c.

A: The information provided in the question is as follows:-The value of 'c' is needs to be determined…

Q: Which type of confidence interval should you use in this situation? A sample of 25 different payroll…

A: Sample size (n) = 25 payroll departmentsSample mean (x¯) = 310.3 daysSample standard deviation (s) =…

Q: 184. Michael and Lorenzo both took the same calculus test. Mi- chael scored an 87 on the test.…

A: We have givenMichael score ( X1) = 87Lorenzo z-score(Z) = + 1.2 Lorenzo mean and standard deviation…

Q: The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard…

A: Mean()=100standard deviation()=12

Q: In a recent year, the total scores for a certain standardized test were normally distributed, with a…

A: Let X be the standardized test scores.Given that X is normally distributed with mean μ=500 and…

Q: A graduate assistant is analyzing whether anxiety is detrimental or enhances one's test taking. To…

A: The given values indicate the result of a quiz that was conducted before and after being exposed to…

Q: Suppose that the following are a random sample of length-of-life measurements of components whose…

A: Given,a random sample of the length of life measurements follow exponential distribution.97%…

Q: Based on a random sample of 50, a 95% confidence interval for the population proportion was…

A: Given, a random sample size = 50and Confidence Interval = 95% confidence.

Q: For a population with a proportion equal to 0.32, calculate the standard error of the proportion for…

A: Solution-:Given: P=0.32 we want to calculate the standard error of the proportion for the following…

Q: Find the standard score (z) shown on each of the following diagrams. (Use Appendix B as necessary.)…

A: Given,the standard normal curves and probabilities. The z-scores need to be found.

Q: The following shows the probability distribution for blood types in the U.S. Blood Type Probability…

A: P(O) = 0.45P(A) = 0.41P(B) = 0.10P(AB) = 0.04Formula Used:P(A or B) = P(A) + P(B)

Q: For a population with a proportion equal to 0.37, calculate the standard error of the proportion for…

A: The Population proportion isp=0.37The sample size is 40,80,120

Q: Out of 193193 randomly selected adults in the United States who were surveyed, 8181 exercise on a…

A: sample size(n)=193x=81Confidence level=99%sample proportion()=

Q: Assume the random variable x is normally distributed with mean μ = 85 and standard deviation o=4.…

A: Given that the data is normally distributed with mean 85 and standard deviation 4.Mean () =…

Q: Find the probability that the full height of a randomly selected tree is less than 166.9 feet.

A: Let x represent the full height of certain species of tree. Assume that x is normally distributed…

Q: a) Find the value of ‘*’ and Find the expected category of hurricane to make landfall, E(X).   What…

A: xP(X=x)10.4120.3430.1340.075*

Q: At a college, 72% of courses have final exams and 46% of courses require research papers. Suppose…

A: It is required to calculate the probability that a course has a final exam or a research project,…

Q: We discussed the women’s 2016 Olympic heptathlon in Chapter 5. Here are the results from the high…

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

Q: A one-tailed sign test is used to test whether there is a positive difference between two…

A: A one-tailed sign test is used to test whether there is a positive difference between two…

Q: A 90​% confidence interval for μ is

A: It is given that Sample mean = 6.6Std. deviation = 0.9Sample size = 43Confidence interval = 90%

Q: Let z be a standard normal random variable with mean ? = 0 and standard deviation ? = 1. Use Table 3…

A: the probability to the right of -1.89

Q: A geologist examines 1414 geological samples for mercury concentration. The mean mercury…

A: It is needed to find the 90% confidence interval for the population mean mercury concentration.

Q: Find the margin of error for the given values of​ c, σ​, and n. c=0.90​, σ=2.3​, n=81 Level of…

A: Given, c=0.90, σ=2.3 and n=81.

Q: [X] Using the derivation of the least squares estimates we covered in class, show mathematically…

A: The goal of least squares regression is to minimize the sum of the squared residuals (differences…

Q: Is the proportion of wildfires caused by humans in the south lower than the proportion of wildfires…

A: It is needed to find the p-value for the test to determine whether the proportion of wildfires…

Q: A simple random sample of size n is drawn from a population that is known to be normally…

A: We have given,The random sample is normally distributed.The sample size .Sample variance Confidence…

Q: The following data represent the pH of rain for a random sample of 12 rain dates. A normal…

A: Let the variable X indicates the pH value of rain on 12 different dates.The given values of X are,…

Q: The data given to the right includes data from 38 candies, and 5 of them are red. The company that…

A: From the provided information,Confidence level = 95%

Q: Suppose 0.1% of the population have a new disease. A test is developed for the disease. 98% of…

A: For the defined events, "N: negative test results" and "H: does not have the disease", the following…

Q: In a normal distribution with μ 250 and o = 20 find the percentile rank of the following data…

A: Mean=250Standard deviation=20

Q: The average time between accidents in a factory is 20 weeks. Find the probability that more than 24…

A: The average time between accidents in a factory is 20 weeks.The objective is to find the probability…

Q: Choose an adult age 18 or over in the United States at random and ask, "How many cups of coffee do…

A: NumberProbability00.3610.2620.1930.084 or more0.11