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28. The weights at birth of five randomly chosen baby giraffes were 111, 115, 120, 103, and 106 pounds. Assume the distribution of weights is normally distributed. Find a 95% confidence interval for the mean weight of all baby giraffes. Use technology for your calculations. Give the confidence interval in the form "estimate ± margin of error." Round to the nearest tenth of a pound. A) 111.0 ± 8.5 pounds B) 110.0 ± 8.5 pounds C) 111.5 ± 9.0 pounds D) There is not enough information given to calculate the confidence interval.

28. The weights at birth of five randomly chosen baby giraffes were 111, 115, 120, 103, and 106 pounds. Assume the distribution of weights is normally distributed. Find a 95% confidence interval for the mean weight of all baby giraffes. Use technology for your calculations. Give the confidence interval in the form "estimate ± margin of error." Round to the nearest tenth of a pound. A) 111.0 ± 8.5 pounds B) 110.0 ± 8.5 pounds C) 111.5 ± 9.0 pounds D) There is not enough information given to calculate the confidence interval.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Question 28
II. A one- sample z test because the data are hot hormally distributed. III. A 95% confidence interval using a critical t statistic. IV. I and III B) I only C) III only D) II only 28. The weights at birth of five randomly chosen baby giraffes were 111, 115, 120, 103, and 106 pounds. Assume the distribution of weights is normally distributed. Find a 95% confidence interval for the mean weight of all baby giraffes. Use technology for your calculations. Give the confidence interval in the form "estimate ± margin of error." Round to the nearest tenth of a pound. A) 111.0 ± 8.5 pounds B) 110.0 ± 8.5 pounds C) 111.5 ± 9.0 pounds D) There is not enough information given to calculate the confidence interval. 29. According to the website www.costofwedding.com, the average cost of flowers for a wedding is $698. Recently, in a random sample of 40 weddings in the U. S. it was found that the average cost of the flowers was $734, with a standard deviation of $102. On the basis of this, a 95% confidence interval for the mean cost of flowers for a wedding is $701 to $767. For this description, which of the following does not describe a condition for a valid confidence interval? A) The sample size of 40 is large enough that knowledge about the population distribution is not necessary and the condition that the population be normally distributed or sample size be larger than 25 is satisfied. B) The sample observations are independent because knowledge about the cost of
Transcribed Image Text:II. A one- sample z test because the data are hot hormally distributed. III. A 95% confidence interval using a critical t statistic. IV. I and III B) I only C) III only D) II only 28. The weights at birth of five randomly chosen baby giraffes were 111, 115, 120, 103, and 106 pounds. Assume the distribution of weights is normally distributed. Find a 95% confidence interval for the mean weight of all baby giraffes. Use technology for your calculations. Give the confidence interval in the form "estimate ± margin of error." Round to the nearest tenth of a pound. A) 111.0 ± 8.5 pounds B) 110.0 ± 8.5 pounds C) 111.5 ± 9.0 pounds D) There is not enough information given to calculate the confidence interval. 29. According to the website www.costofwedding.com, the average cost of flowers for a wedding is $698. Recently, in a random sample of 40 weddings in the U. S. it was found that the average cost of the flowers was $734, with a standard deviation of $102. On the basis of this, a 95% confidence interval for the mean cost of flowers for a wedding is $701 to $767. For this description, which of the following does not describe a condition for a valid confidence interval? A) The sample size of 40 is large enough that knowledge about the population distribution is not necessary and the condition that the population be normally distributed or sample size be larger than 25 is satisfied. B) The sample observations are independent because knowledge about the cost of
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