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- A consumer product testing organization uses a survey of readers to obtain customer satisfaction ratings for the nation's largest supermarkets. Each survey respondent is asked to rate a specified supermarket based on a variety of factors such as: quality of products, selection, value, checkout efficiency, service, and store layout. An overall satisfaction score summarizes the rating for each respondent with 100 meaning the respondent is completely satisfied in terms of all factors. Suppose sample data representative of independent samples of two supermarkets' customers are shown below. Supermarket 1 Supermarket 2 n = 260 n, = 300 = 84 X, = 83 (a) Formulate the null and alternative hypotheses to test whether there is a difference between the population mean customer satisfaction scores for the two retailers. (Let u, = the population mean satisfaction score for Supermarket 1's customers, and let u, = the population mean satisfaction score for Supermarket 2's customers. Enter != for as…2. A drug company has introduced a new treatment for the flu. The current leading brand's treatment cures the flu in 80% of patients. In a random sample of 200 people, the new treatment cured the flu in 166 people. a. Find the 99% confidence interval for the true proportion of patients cured of the flu for the new treatment. b. Interpret the confidence interval in the words of the problem. c. Find the margin of error. d. Does this data and analysis provide evidence so that the company can claim its new treatment is superior to the leading brand at the 99% confidence level? Justify!The figure to the right shows the results of a survey in which 1005 adults from Country A, 1023 adults from Country B, 995 adults from Country C, 1020 adults from Country D, and 1012 adults from Country E were asked whether national identity is strongly tied to birthplace. Country A37%22%27%49%Country BCountry CCountry DCountry E10% Construct a 99% confidence interval for the population proportion of adults who say national identity is strongly tied to birthplace for each country listed. Question content area bottom Part 1 The 99% confidence interval for the proportion of adults from Country A who say national identity is strongly tied to birthplace is (enter your response here ,enter your response here ). (Round to three decimal places as needed.)
- 36. Flights on time 2016 revisited Will your flight get you to your destination on time? The Bureau of Transportation Statis- tics reported the percentage of flights that were delayed each month from 1994 through June of 2016. Here's a histogram, along with some summary statistics: 50 n270 19.696 s 4.214 40 30 20 %23 10 10 15 20 25 30 Delayed % We can consider these data to be a representative sample of all months. There is no evidence of a time trend (r 0,07). a) Check the assumptions and conditions for inference about the mean. # of MonthsThe last part of the question, the options are: sufficient OR insufficient; support OR do not support. Thx!In a survey conducted by the Gallup Organization, 1100 adult Americans were asked how many hours they worked in the previous week. Based on the results, a 95% confidence interval for the mean number of hours worked had a lower bound of 42.7 and an upper bound of 44.5. Provide two recommendations for decreasing the margin of error of the interval. Select the two recommendations that would decrease the margin of error of the interval. U A. Decrease the confidence level. B. Decrease the sample size. C. Increase the confidence level. D. Decrease the standard deviation of hours worked. E. Increase the sample size. F. Use fewer degrees of freedom.
- 1. A company surveyed its employees to determine what the new daily meal allotment dollar amount should be. Of the 159 employees, 94 responded. Pat’s supervisor asked what the recommended dollar amount should be. Pat could take the mean of the 94 responses or calculate a confidence interval about the mean using those 94 responses. Which action of the two (don’t go outside these choices) would give the supervisor a better idea of what the true mean is, and why?A major company would like to assess the impact of using a professional trainer to conduct a confidence-building workshop with its salespeople. A sample of 16 workers is obtained. Half (n = 8) attend the workshop and the other half (n = 8) serves as a control group. Two weeks later, each of the participants is given a questionnaire measuring the level of self-confidence. The data are as follows: Workshop No Workshp 6 19 13 9 8 18 4 10 13 12 4 14 11 19 5 11 a. Use a two-tailed test with a = .05. Conduct the four steps for hypothesis testing and label each step: Step1, Step 2, Step 3, and Step 4. b. Calculate Cohen's d. c. Are the data sufficient to conclude that thier is a significant difference bewteen groups? Write your answer in the form of a sentence.Which of the following statement(s) about confidence intervals are correct? 1) There is no relationship between sample size and confidence interval's width 2) the smaller the sample size, the wider the confidence interval. 3) The higher the confidence level, The narrower the confidence interval. 4) The higher the confidence level, The wider the confidence interval. 5) The larger the sample size, The wider the confidence interval. 6) There is no relationship between confidence level and confidence interval's width.
- A 95% confidence interval is constructed based on a sample of data, and it is 74% ± 3%. A 99% confidence interval based on this same sample of data would have the same center and a larger margin of error. a larger margin of error and probably a different center. the same center and a smaller margin of error. a smaller margin of error and probably a different center. the same center, but the margin of error changes randomly.A consumer group reports that a 90% confidence interval for the mean fat content of chicken nuggets from a fast-food restaurant is (14, 18). What is the mean fat content for the sample of 30 chicken nuggets or the point estimate that help make this confidence interval? A. 32 B. 16 C. 2Construct a 95% confidence interval for p1 - p2 for a survey that finds 30% of 240 males and 41% of 200 females are opposed to the death penalty. Group of answer choices a.(-0.200, -0.021) b.(-1.532, 1.342) c.(-1.324, 1.512) d.(-0.561, 0.651)