3. A survey of 1000 U.S. adults found that 33% of people said that they would get no work done on cyber monday since they would spend all day shopping online. Find the 95% confidence interval of the true proportion. 5. A survey of 100 Americans found that 68% said they find it hard to buy holiday gifts that convey their true feelings. Find the 90% confidence interval of the population proportion. 7. Research by Steelcase found the average worker get interrupted every 11 minutes and takes 23 minutes to get back on task. From a random sample of 200 workers, 168 said they are interruped every 11 minutes by email, texts, alerts, etc. Find the 90% confidence interval of the population proportion of workers who are interrupted every 11 minutes. 11. A survey of 50 students in grades 4 through 12 found 68% have classroom wifi access. Find the 99% confidence interval of the population proportion. 12. Using table G. Find the values for x^2 left and x^2 right. a. a = 0.05, n = 12 b. a = 0.10, n = 20 c. a = 0.05, n = 27 d. a = 0.01, n = 6 e. a = 0.10, n = 41 13. The number of carbohydrates (in grams) per 8-ounce serving of yogurt for each of a random selection of brands is listed below. Estimate the true population variance and standard deviation for the number of carbohydrates per 8-ounce serving of yogurt 95% confidence. Assume the variable is normally distributed. 17, 42, 41, 20, 39, 41, 35, 15, 43 25, 38, 33, 42, 23, 17, 25, 34 14. The standard deviation of a sample of 15 automobile repairs at a local garage was $120.82. Assume the variable is normally distributed. Find the 90% confidence of the true variance and standard deviation.
3. A survey of 1000 U.S. adults found that 33% of people said that they would get no work done on cyber monday since they would spend all day shopping online. Find the 95% confidence interval of the true proportion.
5. A survey of 100 Americans found that 68% said they find it hard to buy holiday gifts that convey their true feelings. Find the 90% confidence interval of the population proportion.
7. Research by Steelcase found the average worker get interrupted every 11 minutes and takes 23 minutes to get back on task. From a random sample of 200 workers, 168 said they are interruped every 11 minutes by email, texts, alerts, etc. Find the 90% confidence interval of the population proportion of workers who are interrupted every 11 minutes.
11. A survey of 50 students in grades 4 through 12 found 68% have classroom wifi access. Find the 99% confidence interval of the population proportion.
12. Using table G. Find the values for x^2 left and x^2 right.
a. a = 0.05, n = 12
b. a = 0.10, n = 20
c. a = 0.05, n = 27
d. a = 0.01, n = 6
e. a = 0.10, n = 41
13. The number of carbohydrates (in grams) per 8-ounce serving of yogurt for each of a random selection of brands is listed below. Estimate the true population variance and standard deviation for the number of carbohydrates per 8-ounce serving of yogurt 95% confidence. Assume the variable is
17, 42, 41, 20, 39, 41, 35, 15, 43
25, 38, 33, 42, 23, 17, 25, 34
14. The standard deviation of a sample of 15 automobile repairs at a local garage was $120.82. Assume the variable is normally distributed. Find the 90% confidence of the true variance and standard deviation.
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