If a sample has 20 observations and a 90% confidence estimate for μ is needed, the appropriate t-score is?

The pulse rates of 168 randomly selected adult males vary from a low of 39 bpm to a high of 111 bpm. Find the minimum sample size required to estimate the mean pulse rate of adult males. Assume that we want 98​% confidence that the sample mean is within 2 bpm of the population mean. Complete parts​ (a) through​ (c) below

If X=115, 25, and n = 31, construct a 99% confidence interval estimate of the population mean, μ. ☐ sμs ☐ (Round to two decimal places as needed.)

Find the critical value to for the confidence level c = 0.99 and sample size n = 9. tc= Click the icon to view the t-distribution table. (Round to the nearest thousandth as needed.)

The z confidence interval for the mean of a Normal population will have a specified margin of error m when the sample size is: a. n = (=*o/m). b. n = (z/m)². O c. n = (*o/m)². d. n ==*o/m.

Find the critical value to for the confidence level c = 0.80 and sample size n = 10. tc = Click the icon to view the t-distribution table. (Round to the nearest thousandth as needed.)