91影视

Formats of Confidence Intervals.

In Exercises 9鈥�12, express the confidence interval using the indicated format. (The confidence intervals are based on the proportions of red, orange, yellow, and blue M&Ms in Data Set 27 鈥淢&M Weights鈥� in Appendix B.)

Red M&Ms Express 0.0434 < p < 0.217 in the form of$p+E$

In Exercises 9鈥�16, assume that each sample is a simple

random sample obtained from a population with a normal distribution.

Body Temperature Data Set 3 鈥淏ody Temperatures鈥� in Appendix B includes a sample of106 body temperatures having a mean of 98.20掳F and a standard deviation of 0.62掳F (for day 2at 12 AM). Construct a 95%confidence interval estimate of the standard deviation of the bodytemperatures for the entire population.

Confidence Intervals. In Exercises 9鈥�24, construct the confidence interval estimate of the mean.

Birth Weights of Girls Use these summary statistics given in Exercise 8:$\mathbf{n}鈥�\mathbf{=}鈥�\mathbf{205}\mathbf{,}\stackrel{\mathbf{炉}}{\mathbf{x}}鈥�\mathbf{=}\mathbf{30}\mathbf{.}\mathbf{4}鈥�\mathbf{hg}\mathbf{,}\mathbf{s}鈥�\mathbf{=}\mathbf{7}\mathbf{.}\mathbf{1}鈥�\mathbf{hg}$. Use a 95% confidence level. Are the results very different from those found in Example 2 with only 15 sample values?

Critical Value Refer to Exercise 7 鈥淩equirements鈥� and assume that the requirements are satisfied. Find the critical value that would be used for constructing a 95% confidence interval estimate of $渭$using the t distribution.

Formats of Confidence Intervals.

In Exercises 9鈥�12, express the confidence interval using the indicated format. (The confidence intervals are based on the proportions of red, orange, yellow, and blue M&Ms in Data Set 27 鈥淢&M Weights鈥� in Appendix B.)

Red M&Ms Express 0.0434 < p < 0.217 in the form of\({\rm{\hat p \pm E}}\).