Use the given information to find the number of degrees of​ freedom, the critical values x2l and x2r​, and the confidence interval estimate of . It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. White Blood Counts of Women 99​% ​confidence; n=148​, s=1.97 ​(1000 ​cells/​L).

A sample of size 25 was taken from a very large population. Sample statistics, x¯ and s, were used to find that the 95% confidence interval was (138.616, 163.384). x¯= s=

Use the t-distribution to find a confidence interval for a mean given the relevant sample results. Give the best point estimate for μ, 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 95% confidence interval for using the sample results x = 92.1, s = 7.8, and n = 42 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= i margin of error = The 95% confidence interval is Save for lat to

Use the t-distribution to find a confidence interval for a mean μ given the relevant sample results. Give the best point estimate for μ, 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 95% confidence interval for μ using the sample results x¯=10.9, s=5.3, and n=30

Use technology to construct the confidence intervals for the population variance o² and the population standard deviation a. Assume the sample is taken from a normally distributed population. c=0.99, s= 33, n= 16 The confidence interval for the population variance is ( ). (Round to two decimal places as needed.) The confidence interval for the population standard deviation is ( ). (Round to two decimal places as needed.)

A statistics class is estimating the mean height of all female students at their college. They collect a random sample of 42 female students and measure their heights. The mean of the sample is 65.3 inches and the sample standard deviation is 5.4 inches. Find the 90% confidence interval for the mean height of all female students in their school? Assume that the distribution of individual female heights at this school is approximately normal. 1. The t value is 1.3025 2. The standard error has a value of -- 3. The margin of error has a value of 4. Find the 90% confidence interval for the mean height of all female students in their school

A sample of 8 adult elephants had an average weight of 12,300 pounds. the standard deviation for the sample was 22 pounds. find the 95% confidence interval of the population mean for the weights of adult elephants. (the t distribution, table F, must be used for the confidence interval.)

A new screening test for Lyme disease is developed for use in the general population. The sensitivity and specificity of the new test are 60% and 70%, respectively. Five hundred people are screened at a clinic during the first year the new test is implemented. Assume the true prevalence of Lyme disease among clinic attendees is 10%. Calculate the predictive value of a positive test.

Both, the Cohen's d and confidence interval, measure the impact of the IV on the DV. The only difference is that the confidence interval does so for the population, whereas the Cohen's d does so for the sample.

Construct the indicated confidence interval for the population mean μ using the​ t-distribution. Assume the population is normally distributed. c=0.95​, x=13.9​, s=0.65​, n=12