ssume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t2. (b) find the critical value z/2. or (c) state that neither the normal distribution nor the t distribution applies. lere are summary statistics for randomly selected weights of newborn girls: n= 190, = 28.5 hg, s= 6.3 hg. The confidence level is 99%. elect the correct choice below and, if necessary, fill in the answer box to complete your choice. DA. 4/2 (Round to two decimal places as needed.) DB. (Round to two decimal places as needed.) OC. Neither the normal distribution nor the t distribution applies.

Use the t-distribution to find a confidence interval for a mean u given the relevant sample results. Give the best point estimate for u, the margin of error, and the confidence interval. Assume the results come from a random sample from a population that is approximately normally distributed. A 99% confidence interval for u using the sample results I = 50.4, s = 10.7, and n = 10 Round your answer for the point estimate to one decimal place, and your answers for the margin of error and the confidence interval to two decimal places. point estimate margin of error = The 99% confidence interval is i to

Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t/2, (b) find the critical value z,/2, or (c) state that neither the normal distribution nor the t distribution applies. 230, x 32.6 hg, s = 7.9 hg. The confidence level is 90% Here are summary statistics for randomly selected weights of newborn girls: n Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. (Round to two decimal places as needed.) В. Za/2 (Round to two decimal places as needed.) C. Neither the normal distribution nor the t distribution applies.

n1=16 x‾1=124 s1=35   n2=12 x‾2=86 s2=31 Use this data to find the 98% confidence interval for the true difference between the population means. Assume that the population variances are not equal and that the two populations are normally distributed. Copy Data Step 2 of 3 :   Find the margin of error to be used in constructing the confidence interval. Round your answer to six decimal places. Step 3 of 3 : Please also find the high and low endpoints and round to four decimal points.

The data below are the ages of a random sample of 8 men in a bar. It is known that the population of ages are normally distributed with a standard deviation of 7. Determine the 90% confidence interval estimate of the population mean.   49, 68, 25, 36, 56, 38, 27, 47   Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits.   Confidence Interval =

Construct the indicated confidence interval for the population mean u using the t-distribution. Assume the population is normally distributed. c=0.99, x= 13.7, s= 4.0, n= 7 (Round to one decimal place as needed.)

You are interested in finding a 90% confidence interval for the average commute that non-residential students have to their college. The data below show the number of commute miles for 14 randomly selected non-residential college students. Round answers to 3 decimal places where possible.   5 8 11 10 12 19 24 6 26 10 26 10 26 15   a. To compute the confidence interval use a     distribution. b. With 90% confidence the population mean commute for non-residential college students is between  and   miles. c. If many groups of 14 randomly selected non-residential college students are surveyed, then a different confidence interval would be produced from each group. About  percent of these confidence intervals will contain the true population mean number of commute miles and about  percent will not contain the true population mean number of  commute miles.

Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t,/2, (b) find the critical value z,12, or (c) state that neither the normal distribution nor the t distribution applies. 40- The confidence level is 95%, o is not known, and the histogram of 58 player salaries (in thousands of dollars) of football players on a team is as shown. 30- 20- 10- 4000 8000 1200 1600 20000 Salary (thousands of dollars) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. ta/2= (Round to two decimal places as needed.) OB. Za/2 = (Round to two decimal places as needed.) O C. Neither the normal distribution nor the t distribution applies. houanbo

F Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value ta/2, (b) find the critical value Za/2, or (c) state that neither the normal distribution nor the t distribution applies. The confidence level is 90%, o is not known, and the histogram of 65 player salaries (in thousands of dollars) of football players on a team is as shown. UA. ta/2 O B. (Round to two decimal places as needed.) Za/2= (Round to two decimal places as needed.) OC. Neither the normal distribution nor the t distribution applies. 40- 30- 20- 0- 0 4000 8000 12000 16000 20000 Salary (thousands of dollars) Q Q 4

Construct the indicated confidence interval for the population mean u using the t-distribution. Assume the population is normally distributed. c= 0.99, x 13.8, s=4.0, n=7 The 99% confidence interval using a t-distribution is ( D (Round to one decimal place as needed.)