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 = 20c. a = 0.05, n = 27d. a = 0.01, n = 6e. 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, 4325, 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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Asked Nov 19, 2019
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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.

 

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Expert Answer

Step 1

(3)

From the given information,

P = 33% and n = 1000

 Formula for confidence interval for true proportion is,

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CI P+E here, E margin of error P 1-P E Zx For 95% confidence level z-value is 1.96

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Step 2

             Margin of error (E),

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P(1-P E-Zx n 0.33(1-0.33) 1.96x| 1000 -0.0291440862 E 0.0291

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Step 3

     Now, required 95% con...

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Advanced Topics in Statistics

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