6.- The day after Thanksgiving-called Black Friday–is one of the largest shopping days in the United States. A group of researchers conducted interviews with a sample of 38 women shopping on Black Friday to gauge their shopping habits and reported the results in a published paper, in 2011. One question was, “How many hours do you usually spend shopping on Black Friday?" Data for the 38 shoppers are listed here: 6644 3 16 4 456 6 5 5 4 6 5 64 5 4 4 4 7 12 5 8 6 10 5 8 8 3 3856 10 11. Descriptive statistics for these data are in this table: A Explore Data - Descriptive Statistics Options Which column of data would you like to explore? Eplore Data Colum4 Summary statistiest Mean Column Variance Sid. dev. Std. err. Median Range Min Max QI QI 16 4 7 Sample Size, n Meani Wediant Midrange: 34 6.07947 vard 38 60789474 7.5881935 2.7546676 0 44686609 9.5 6.650967 7.588193 Variance, A21 Standard Deviation, s 2.7546 Mean Abselute Deviation 1.958449 13 Koefficient of Varianice: 4S. 3IN Range a) Use the information in the table to estimate the population mean number of hours spent shopping on Black Friday with a 95% confidence interval. Answer: b) A retail store advertises that the true mean number of hours spent shopping on Black Friday is µ = 5.5 hours. Do you agree with this claim? Use a two-tailed alternative hypothesis, with a = 0.05. %3D Test statistics = P-value = CV = Conclusion: Keep H. Answer: RR = Reject H. c) Given the histogram, box plot, and the normality plot below, do you think the test using the normality assumption is valid? Answer: YES NO

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