Ans : Option A.
Use the paired t-interval procedure to obtain the required confidence interval. You may assume that the...
Use the paired t-interval procedure to obtain the required confidence interval. You may assume that the conditions for using the procedure are satisfied. Ten different families are selected at random. The amount of water each family uses per day before and after viewinga conservation video is recorded. The amounts (in gallons) are shown below. Before 33 33 38 33 35 35 40 40 40 31 After 34 28 25 2835 33 31 28 35 33 Determine a 90% confidence interval...
Use the paired t-interval procedure to obtain the required confidence interval. You may assume that the conditions for using the procedure are satisfied. The table below shows the weight, in pounds, of 9 subjects before and after following a particular diet for two months. Subject A B C D E F G H I Before 168 180 157 132 202 124 190 210 171 After 165 173 162 121 183 126 180 195 163 Determine a 99% confidence interval for...
x =30 n=2323, σ=66, confidence =90% a. Use the one-mean z-interval procedure to find a confidence interval for the mean of the population from which the sample was drawn. The confidence interval is from to b. Obtain the margin of error by taking half the length of the confidence interval. What is the length of the confidence interval? c. Obtain the margin of error by using the formula E=z(a/2) x o/ square root of n Identify the critical value. What...
Use a t-distribution to find a confidence interval for the difference in means ud=u1-u2 using the relevant sample results from paired data. Assume the results come from random samples from populations that are approximately normally distributed, and that differences are computed using d=x1-x2 . a 95% confidence interval for ud using the paired difference sample results xd-3.4, sd=2.1, nd=30
Obtain the required confidence interval. You may assume normal distributions. A researcher was interested in comparing the amount of time spent watching television by women and by men. Independent simple random samples of 14 women and 17 men were selected, and each person was asked how many hours he or she had watched television during the previous week. The summary statistics are as follows. Men Women x1 - 1242 - 143 52-52 ni - 14 n2 = 17 91-39 Determine...
Use a t-distribution to find a confidence interval for the difference in means μd=μ1-μ2 using the relevant sample results from paired data. Assume the results come from random samples from populations that are approximately normally distributed, and that differences are computed using d=x1-x2 . A 95% confidence interval for μd using the paired difference sample results x¯d=3.1, sd=2.4, nd=30. Give the best estimate for μd, the margin of error, and the confidence interval. Enter the exact answer for the best...
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. sample mean=3.0 n=41 s=5.4 confidence level=90% The 90% confidence interval about μ is ?? to ???
use the one mean t interval procedure to find a confidence level for the mean of the population. x bar= 50, n=16, s=5 and the confidence level is 99%
Use the standard normal distribution or the t distribution to construct a 9 % confidence interval for the population mean Justify your decision if neither distribution can be used, explain why Interpret the results ln a random sample of 17 mortgage institutions, the mean interest rate was 3.69% and the standard deviation was 36% Assume the iterest rates are normally distributed Which distribution should be used to construct the confidence interval? ○ A. Use a t-distribution because it is a...
Use the standard normal distribution or the t-distribution to construct a 99% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a recent season, the population standard deviation of the yards per carry for all running backs was 1.21. The yards per carry of 25 randomly selected running backs are shown below. Assume the yards per carry are normally distributed. 3.2 6.8 6.1 3.6 6.3 7.1 6.4 5.5...