The waiting times (in minutes) of a random sample of 20 people at a bank have a sample standard deviation of 4.4 minutes. Construct a confidence interval for the population variance of and the population standard deviation o. Use a 95% level of confidence. Assume the sample is from a normally distributed population. What is the confidence interval for the population variance o²? (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal place as needed.) O A. With 95% confidence, you can say that the population variance is greater than O C. With 95% confidence, you can say that the population variance is between and What is the confidence interval for the population standard deviation ? OB. With 5% confidence, you can say that the population variance is between and OD. With 5% confidence, you can say that the population variance is less than

Calculate the mean of the data, and then calculate the deviations for each of the 6 scores. Using that information, calculate the variance and standard deviation of the data set, and then calculate a Z-Score for each of the 6 scores in the data set.                                                6, 10, 9, 13, 14, 11

You are given the smaple mean and the population m standard deviation. Use this info to construct the 90% and 95% confidence intervals for the population mean. Interpert the results and compare the widths of the confidence intervals. A random sample of 50 home theater systems has a mean price of $145. Assume the population standard deviation is $17.30

Find the 95% confidence interval for the population mean if the sample is × = 70.4 and the sample size is n = 24. Assume that the population is normally distributed and the sample standard deviation is 0 = 5. Left Left: Right:

Use z scores to compare the given values.   The tallest living man at one time had a height of 256cm. The shortest living man at that time had a height of 114.6 cm. Heights of men at that time had a mean of 174.87 cm and a standard deviation of 7.57 cm. Which of these two men had the height that was more​ extreme?   Since the z score for the tallest man is z=____ and the z score for the shortest man is z=_____​, the (Shortest/tallest) man had the height that was more extreme. ​(Round to two decimal​ places.)

A variable of a population has a normal distribution. Suppose that you want to find a confidence interval for the population mean. a. If you know the population standard deviation, which procedure would you use?b. If you do not know the population standard deviation, which procedure would you use?

Tina catches a 14-pound bass.  She does not know the population mean or standard deviation.  So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds.  Find the t and calculate a 95% (α = .05) confidence interval.

Determine whether the statement is true or false. If it is false, rewrite it as a true statement. As the size of a sample increases, the standard deviation of the distribution of sample means increases. Choose the correct choice below. C OA. This statement is false. A true statement is, "As the size of a sample increases, the standard deviation of the distribution of sample means decreases." OB. This statement is true. OC. This statement is false. A true statement is, "As the size of a sample decreases, the standard deviation of the distribution of sample means decreases." OD. This statement is false. A true statement is, "As the size of a sample increases, the standard deviation of the distribution of sample means does not change." Time Remaining: 01:26:37

Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal.   Refer to the accompanying data set. Use a 0.05 significance level to test the claim that women and men have the same mean diastolic blood pressure.   a. The test statistic is ​(Round to two decimal places as​ needed.)   b. The​ P-value is ​(Round to three decimal places as​ needed.)

Calcium levels in people are normally distributed with a mean of 9.7 mgdL and a standard deviation of 0.5 mgdL . Individuals with calcium levels in the bottom 10% of the population are considered to have low calcium levels. Find the calcium level that is the borderline between low calcium levels and those not considered low. Carry your intermediate computations to at least four decimal places. Round your answer to one decimal place.