a. Use the one-mean t-interval procedure with the sample mean, sample size, sample standard deviation, and confidence level given below to find a confidence interval for the mean of the population from which the sample was drawn. b. Obtain the margin of error by taking half the length of the confidence interval. S c. Obtain the margin of error by using the formula ta/2 x=24 n=25 s=2 Click here to view Page 1 of the table of t-values with area alpha to its right. Click here to view Page 2 of the table of t-values with area alpha to its right. a. The 90% confidence interval about u isto. (Round to three decimal places as needed.) confidence level = 90% b. The margin of error found by taking half the length of the confidence interval is (Round to three decimal places as needed.) c. The margin of error found by using the formula is (Round to three decimal places as needed.)

The data set below represents the weights in grams of 10 randomly selected adult male fox squirrels from a forest. Assume the weights are normally distributed. 821      857      782      930      720      821      794      876      810      840           Find the sample mean and sample standard deviation              Construct a 90% confidence interval for the population mean.                Interpret the results from b.

If n=200 and X=70, construct a 99% confidence interval estimate for the population proportion. SAS (Round to four decimal places as needed.)

If N = 25, ?̅= 135, s = 24 and assuming that the population is normally distributed,construct a 95% confidence interval estimate for the population mean.

Which type of confidence interval should you use in this situation? A sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8 days. The distribution is approximately normally distributed. Find the 90% confidence interval for the average days worked of all payroll departments.   Question 2 options:   1)  a confidence interval for the mean using a table value from the standard normal distribution.   2)  a confidence interval for the mean using a table value from the t distribution.   3)  a confidence interval for a proportion using a table value from the standard normal distribution.   4)  a confidence interval for proportion using a table value from the t distribution.   5)  none of the above.