The new marketing manager claims that the rate of returned items fell below 5% during his term. Since only one of the 50 products sold in the last month has been returned, test the accuracy of this claim at the 5% significance level.

Q: what would the null hypothesis be if you wanted to test whether a trait segregates in a 9:3:3:1…

A: HypothesisNull Hypothesis (H0) = The data follows the phenotypic ratio (i.e. 9:3:3:1)Alternative…

Q: Question No. 03: Research at the University of Toledo indicates that 50% of students change their…

A: Introduction :  when the sample size is large then the testing of equality of sample proportion with…

Q: A study, which randomly surveyed 3,700 households and drew on this information from the IRS, found…

A: A​ study, which randomly surveyed 3,700 households and drew on this information from the​ IRS, found…

Q: (a) Prove that in sampling from a N(µ, o²) population, the sample mean is a consistent estimator of…

A:

Q: In 2010, 36% of adults in a certain country were morbidly obese. A health practitioner suspects that…

A: State the hypotheses. That is, there is no evidence that true percent adults in a certain country…

Q: In a study of whether taking a garlic supplement reduces the risk of getting a cold, participants…

A: The type of study conducted here Treatment-Control study in which we have two groups : one is…

Q: In a related-samples t test, the null hypothesis posits that the mean of the sampling distribution…

A: Here related sample t test is used to compare  paired data

Q: In testing the difference between the means of two independent populations, if neither population is…

A: Statistical inference is the theory of making the decision about the population parameters using…

Q: i want Z

A: The known values are, x = 328 n = 1160 The sample proportion is,

Q: In a study that compared average time taken by a men and women to do a certain job, a random sample…

A: Given Information :  In a study that compared average time taken by a men and women to do a certain…

Q: The counterfactual ideal comparison group for a cohort study would consist of exactly the same…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: According to the IRS, individuals filing federal income tax returns prior to March 31 received an…

A: The significance of the mean is calculated if the population standard deviation is unknown and the…

Q: Using the work sheet on the next page and an oa = .01, test the claim that p> 0, there is a…

A: Given Information: Significance level α=0.01 Claim: ρ>0 To test the claim that population…

Q: At a certain college, it is estimated that at most 35% of the students ride bicycles to class. At…

A: Given that the proportion of students that ride bicycles to class = 35% or p =0.35 Let x= 28…

Q: On average, a sample of n = 36 scores from a normal population with σ = 10 will provide a better…

A: Given n1=36 Standard deviations=10 n2=9

Q: A tax preparation firm is interested in comparing the quality of work at two of its regional…

A:

Q: For a two-tailed hypothesis test evaluating a Pearson correlation, what is stated by the null…

A: We test the population parameter in the hypothesis testing.

Q: A researcher studying public opinion of proposed Social Security changes and asks a random sample of…

A: From the given information, p =0.37.

Q: Suppose you are constructing a Cl for a mean using the T-distribution and your sample size is 17.…

A: Degrees of freedom = n-1

Q: As we noted previously, even a very small effect can be significant if the sample is large enough.…

A: Solution-: Given: r=0.60, n=25  To test, Hypothesis: H0: There is no significant relationship…

Q: In a previous poll, 47% of adults with children under the age of 18 reported that their family ate…

A: The hypothesized proportion is 0.47.

Q: In a previous poll, 39% of adults with children under the age of 18 reported that their family ate…

A: We have to test the claim that the proportion of families with children under the age of 18 who eat…

Q: Assume that you have a binomial experiment with p = 0.4 and a sample size of 120. What is the…

A: Given that, From binomial experiment, Probability, p = 0.4 Sample size, n = 120

Q: An article reports that blue eyed people earn less than brown eyed people, with these numbers:…

A: P-value is much greater than 0.05 level of significance.

Q: In a previous poll, 34% of adults with children under the age of 18 reported that their family ate…

A: We have to find given hypotgesis.

Q: A statistics professor wants to see if more than 80% of her students enjoyed her class. At the end…

A: The p-value is 0.12.

Q: The Pearson correlation is valuated for a sample of n=32 individuals.If a hypothesis test is used to…

A: we have to find out  degree of freedom  for  t test statistics  here given that the test  the…

Q: The following data are from a hypothetical experiment in which one group of students took a quiz in…

A: In this study, one group of students took quiz in well-lit room and another group of students took…

Q: If we want to use the t-distribution to make an inference from our normally-distributed sample of…

A: If we want to use the t-distribution to make an inference from our normally-distributed sample of…

Q: A​ state-by-state survey found that the proportions of adults who are smokers in state A and state B…

A: Denote p1, p2 as the true population proportions of adult smokers in states A and B, respectively.

Q: In a previous nationwide poll of a large country, 41% of adults with children under the age of 18…

A:

Q: Does a statistics course improve a student's mathematics skills,as measured by a national test?…

A:

Q: A population of N = 100 scores has μ = 30variance? and σ  = 4. What is the population?

A:

Q: A sociologist hypothesizes that the expected proportion of the number of children in certain family…

A: Null Hypothesis:   H0: All expected proportion of the number of children in certain family units…

Q: Which of the following correctly represents the null and alternative hypothesis for the mentioned…

A: Here, we need to test whether the tutoring has a significant effect or not.

Q: QUESTION 2 A computer manufacturer believes that the proportion of hardware malfunctions is…

A: Given information: In order to test the difference in hardware malfunctions in humid climates and in…

Q: When a person states at the outset of an experiment that a higher average score will be received by…

A: Given that :  The higher average score will be recevied by a group receiving some kind of treatment…

Q: In a previous poll, 30% of adults with children under the age of 18 reported that their family ate…

A:

Q: Which of the following scatterplots provides evidence that the condition of equal variance for…

A: One of the basic assumptions of the CLRM is that σ2 of each disturbance term conditional on the…

Q: If a journal publishes 50 scientific papers per year, each using a significance level of 5%, what is…

A: answer is explained below

Q: If the alternate hypothesis states that p does not equal 4,000, what is the rejection region for the…

A: Given ,  alternate hypothesis Ha:μ≠4000

Q: A college professor suspects that students at his school are getting less than 8 hours of sleep a…

A:

Q: 10

A: From the given information, the total number of observed frequencies is 50.

Q: on the average. The actual times (minutes) that 10 randomly selected trains block crossings were…

A: We have given that data And population mean = 8  And i want to find mean and standard deviation.

Q: Suppose that, in a comparison of two holiday companies’ customers, of the 75 who went with Happy…

A: Given data : x1= 45 n1= 75 x2= 48 n2= 90 significance level, 0.025

Q: A worker wants to compare the interest rate for 48-month fixed-rate auto loans and 48- month…

A: Confidence interval (C.I) formula for the ratio of the two population variances is defined as…

Q: According to Nielsen Media Research, of all the U. S. Households that owned at least one television…

A: From the provided information, The hypotheses can be constructed as: H0: p = 0.83 Ha: p < 0.83…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.