Cookie Monster owns a cookie factory. His factory produces cookie flavors in the following proportions: Cookie Flavor Production Sam's Proportion Samples Count Sugar Chocolate Chip 0.2 22 0.6 38 Trash 0.2 40 Sam is unhappy that his random sample of 100 cookies had 22 Sugar-flavored, 38 Chocolate- flavored, and 40 Trash-flavored cookies in it. However, he doesn't remember whether he got his cookies from Cookie Monster's factory or another factory. You decide to run a hypothesis test to figure out whether Sam's box came from Cookie Monster's factory or not. 1) Choose the right Null hypothesis for this problem. State your reason why you choose it. a) 22 of the cookies in the observed sample were sugar flavor, 38 were chocolate chip, and 40 were trash flavor. b) Sam's box did not come from Cookie Monster's factory c) Sam's box did come from Cookie Monster's factory d) The sample was not chosen randomly, because of a bias in how bees were selected 2) Choose the right Alternative hypothesis for this problem. State your reason why you choose it. a) 22 of the cookies in the observed sample were sugar flavor, 38 were chocolate chip, and 40 were trash flavor. b) Sam's box did not come from Cookie Monster's factory c) Sam's box did come from Cookie Monster's factory d) The sample was not chosen randomly, because of a bias in how bees were selected

Cookie Monster owns a cookie factory. His factory produces cookie flavors in the following proportions: Cookie Flavor Production Sam's Proportion Samples Count Sugar Chocolate Chip 0.2 22 0.6 38 Trash 0.2 40 Sam is unhappy that his random sample of 100 cookies had 22 Sugar-flavored, 38 Chocolate- flavored, and 40 Trash-flavored cookies in it. However, he doesn't remember whether he got his cookies from Cookie Monster's factory or another factory. You decide to run a hypothesis test to figure out whether Sam's box came from Cookie Monster's factory or not. 1) Choose the right Null hypothesis for this problem. State your reason why you choose it. a) 22 of the cookies in the observed sample were sugar flavor, 38 were chocolate chip, and 40 were trash flavor. b) Sam's box did not come from Cookie Monster's factory c) Sam's box did come from Cookie Monster's factory d) The sample was not chosen randomly, because of a bias in how bees were selected 2) Choose the right Alternative hypothesis for this problem. State your reason why you choose it. a) 22 of the cookies in the observed sample were sugar flavor, 38 were chocolate chip, and 40 were trash flavor. b) Sam's box did not come from Cookie Monster's factory c) Sam's box did come from Cookie Monster's factory d) The sample was not chosen randomly, because of a bias in how bees were selected

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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A mail-order company has two warehouses, one on the West Coast and thesecond on the East Coast. The company’s policy is to mail all orders placed with itwithin 72 hours. The company’s quality control department checks quite oftenwhether or not this policy is maintained at the two warehouses. A recently takensample of 400 orders placed with the warehouss on the West Coast showed that364 of them were mailed withnin 72 hours. Another sample of 300 orders placedwith the warehouse on the East Coast showed that 279 of them were mailedwithin 72 hours.a) Construct a 97% confidence interval for the difference between theproportions of all orders placed at the two warehouses that are mailed within 72hours.b) Using a 2.5 % significance level, can you conclude that the proportion of allorders placed at the warehouse on the West Coast that are mailed within 72hours is lower than the corresponding proportion for the warehouse on the EastCoast?
A corporation randomly selects 150 salespeople and finds that 66% who have never taken a self−improvement course would like such a course. The firm did a similar study 10 years ago in which 60% of a random sample of 160 salespeople wanted a self-improvement course. The groups are assumed to be independent random samples. Let π1 and π2 represent the true proportion of workers who would like to attend a self-improvement course in the recent study and the past study, respectively. If the firm wanted to test whether this proportion has changed from the previous study, which represents the relevant hypotheses? A. H0:π1−π2≤0 versus H1:π1−π2>0 B. H0:π1−π2≥0 versus H1:π1−π2<0 C. H0:π1−π2=0 versus H1: π1−π2≠0 D. H0:π1−π2≠0 versus H1:π1−π2=0
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