A study of fast-food intake is described in the paper study "What People Buy From Fast-Food Restaurants" (obesity [2009]: 1369-1374). Adult customers at three hamburger chains (McDonald's, Burger King, and Wendy's) at lunchtime in New York City were ap- proached provide their receipt when exiting. The receipts were then used to determine what was purchased and the number of calories consumed was determined. In all, 3857 people participated in the study. The saole mean number of calories consumed was 857 ani the sample standard deviation was 677. as they entered the restaurant and asked to 10 a. The sample standard deviation is quite large. What does this tell you about number of calories consumed in a hamburger-chain lunchtime fast-food purchase in New York City? b. Given the values of the sample mean and standard deviation and the fact that the number rcises answered in back Data set available online Video Sol of calories consumed can't be negative, explain why it is not reasonable to assume that the distribution of calories consumed is normal. R c. Based on a recommended daily intake of 2000 calories, the online Healthy Dining Finder (www.healthydiningfinder.com) recommends a target of 750 calories for lunch. Assuming that it is reasonable to regard the sample of 3857 fast-food purchases as representative of all hamburger-chain lunchtime purchases in New York City, carry out a hypothesis test to determine if the sample provides convincing evidence that N the mean number of calories in a New York City hamburger-chain lunchtime purchase is greater than the lunch recommendation of 750 calories. Use a = .01. (Hint: See Example 10.15.) dam d. Would it be reasonable to generalize the conclusion of the test in Part (c) to the lunchtime fast-food purchases of all adult Americans? Explain why or why not. e. Explain why it is better to use the customer receipt to determine what was ordered rather than just asking a customer leaving the restaurant what he or she purchased. f. Do you think that asking customers before they order to provide a receipt when they leave could have introduced a potential bias? Explain.

A study of fast-food intake is described in the paper study "What People Buy From Fast-Food Restaurants" (obesity [2009]: 1369-1374). Adult customers at three hamburger chains (McDonald's, Burger King, and Wendy's) at lunchtime in New York City were ap- proached provide their receipt when exiting. The receipts were then used to determine what was purchased and the number of calories consumed was determined. In all, 3857 people participated in the study. The saole mean number of calories consumed was 857 ani the sample standard deviation was 677. as they entered the restaurant and asked to 10 a. The sample standard deviation is quite large. What does this tell you about number of calories consumed in a hamburger-chain lunchtime fast-food purchase in New York City? b. Given the values of the sample mean and standard deviation and the fact that the number rcises answered in back Data set available online Video Sol of calories consumed can't be negative, explain why it is not reasonable to assume that the distribution of calories consumed is normal. R c. Based on a recommended daily intake of 2000 calories, the online Healthy Dining Finder (www.healthydiningfinder.com) recommends a target of 750 calories for lunch. Assuming that it is reasonable to regard the sample of 3857 fast-food purchases as representative of all hamburger-chain lunchtime purchases in New York City, carry out a hypothesis test to determine if the sample provides convincing evidence that N the mean number of calories in a New York City hamburger-chain lunchtime purchase is greater than the lunch recommendation of 750 calories. Use a = .01. (Hint: See Example 10.15.) dam d. Would it be reasonable to generalize the conclusion of the test in Part (c) to the lunchtime fast-food purchases of all adult Americans? Explain why or why not. e. Explain why it is better to use the customer receipt to determine what was ordered rather than just asking a customer leaving the restaurant what he or she purchased. f. Do you think that asking customers before they order to provide a receipt when they leave could have introduced a potential bias? Explain.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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