STATS FINAL ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS

STATS FINAL ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS When determining the sample size for a proportion for a given level of confidence and sampling error, the closer to 0.50 that π is estimated to be, the sample size required ________. - Answer -larger The width of a confidence interval estimate for a proportion will be - Answer -narrower for 90% confidence than for 95% confidence. A 99% confidence interval estimate can be interpreted to mean that - Answer -both of the above If you were constructing a 99% confidence interval of the population mean based on a sample of n = 25, where the standard deviation of the sample s = 0.05, the critical value of t will be - Answer -2.7970.Need assistance on Online classes, Exams & Assignments? Reach out for instant help!! Full Course Assistance, Plagiarism-free Essay Writing, Research Paper, Dissertation, Discussion Posts, etc…. Confidential & Secure services. Tutors are available for all subjects! Email now at: Which of the following is NOT true about the Student's t distribution? - Answer -It is used to construct confidence intervals for the population mean when the population standard deviation is known. Suppose a 95% confidence interval for μ turns out to be (1,000, 2,100). Give a definition of what it means to be "95% confident" as an inference. - Answer -In repeated sampling, 95% of the intervals constructed would contain the population mean. Suppose a 95% confidence interval for has been constructed. If it is decided to take a larger sample and to decrease the confidence level of the interval, then the resulting interval width would . (Assume that the sample statistics gathered would not change very much for the new sample.) - Answer -be narrower than the current interval width In the construction of confidence intervals, if all other quantities are unchanged, an increase in the sample size will lead to an interval that's.. - Answer -narrower A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain'snew store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results: X = $50.50 and s 2 = 400 . Assuming the distribution of the amount spent on their first visit is approximately normal, what is the shape of the sampling distribution of the sample mean that will be used to create the desired confidence interval for - Answer -A t distribution with 14 degrees of freedom A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain's new store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results: $50.50 X = and s 2 = 400 . Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution - Answer -$50.50 +- $11.0