What do you value most when shopping in a retail​ store? According to a​ survey, 27​% of consumers value personalized experience most.   Repeat parts​ (a) and​ (b), assuming that the survey had a sample size of n=11,000.   Construct a 90%confidence interval estimate for the population proportion of social media users that have purchased an item promoted by a celebrity on a social media site.   _______ ≤π≤_________ ​(Round to four decimal places as​ needed.

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Which two of the following could be confidence intervals with the same sample? (0.45, 0.75) (0.4, 0.5) (0.35, 0.45) (0.3, 0.6)

The results: A. Are, or B. Are not   significantly: A. High, or B. Low   so there: A. is, or B. is not

Which of the following confidence intervals would have a wider width for the same set of data? A 90% interval. A 99% interval. Group of answer choices The 90% interval. The 99% interval.

Statistics students surveyed 135 students at Tallahassee Community College. From their data we are 95% confident that between 44.7% and 61.9% of all TCC students are female. The students realize that this interval contains a large margin of error. What can they do to make a narrower interval? 1. Survey more students.   2. Use a 99% confidence level.   3. Survey more students and use a 99% confidence interval.   4. None of the other choices.

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:) For each of the situations below, define the parameter (proportion or mean) and write the null and alternative hypotheses in terms of parameter values. Example: We want to know if the proportion of up days in the stock market is 50%. Answer: Let p the proportion of up days. Ho: p = 0.5 vs. HA P# 0.5. : (a) Last year, customers spent an average of $45.82 per visit to the company's website. Based on a random sample of purchases this year, the company wants to know if the mean this year has changed. Let (p, p, μ, or x)= the of customer spending per visit to the website. ; HA Ho: (b) A pharmaceutical company wonders if their new drug has a cure rate lower than the 30% reported by the placebo. Let Ho: (p, p, μ, or )= the ; HA: Ho: of patients cured by the new drug. (c) A bank wants to know if the percentage of customers using their website has changed from the 40 % that used it before their system crashed last week. Let (p, p, μ, or ) the ; HA: of customers using the bank website.