The following data are the amounts that a sample of 15 customers spent for lunch ($) at a fast-food restaurant. Complete

[answerhappygod]

The Following Data Are The Amounts That A Sample Of 15 Customers Spent For Lunch At A Fast Food Restaurant Complete 1 (308.23 KiB) Viewed 39 times

The following data are the amounts that a sample of 15 customers spent for lunch ($) at a fast-food restaurant. Complete parts (a) through (d) below. 7.07 6.81 7.48 4.87 6.32 5.80 6.54 8.30 9.51 6.52 5.52 7.93 8.30 9.66 a. Construct a 95% confidence interval estimate for the population mean amount spent for lunch ($) at a fast-food restaurant. 6.32 sus 7.89 (Round to two decimal places as needed. Do not include the $ symbol in your answer.) b. Interpret the interval constructed in (a). Choose the correct answer below. 5.95 OA. The mean amounts in dollars spent for lunch at the fast-food restaurant of 95% of all samples of the same size are contained in the interval. OB. Conclude with 95% confidence that the mean amount in dollars spent for lunch at the fast-food restaurant for the sample is contained in the interval. C. Conclude with 95% confidence that the population mean amount in dollars spent for lunch at the fast-food restaurant is contained in the interval. O D. 95% of the sample data fall between the limits of this confidence interval. c. What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)? A. The population distribution is uniformly distributed. B. The population distribution is skewed right. C. The population distribution is normally distributed. D. The population distribution is skewed left. The table below contains a certain social media company's penetration values (the percentage of a country's population that use this social media) for 14 countries. Complete parts a through c below. 14 48 21 28 15 15 83 56 29 36 26 23 40 30 a. Construct a 95% confidence interval estimate for the population mean social media penetration. The 95% confidence interval estimate is from 22.21 to 44.08. (Round to two decimal places as needed.) b. What assumption do you need to make about the population distribution to construct the interval in (a)? Choose the correct answer below. O A. The social media penetration follows the t distribution. OB. The populations of the sampled countries follow the t distribution. C. The social media penetration is normally distributed. OD. The populations of the sampled countries are normally distributed. c. Given the data presented, do you think the assumption needed in (a) is valid? Explain. Choose the correct answer below. OA. Yes, the data indicate the population distribution is approximately normal. OB. Yes, the data indicate the population distribution approximately follows the t distribution. OC. No, the data indicate the population distribution is skewed to the right. OD. No, the data indicate the population distribution is skewed to the left. C