Question 6 (6 points) Compute a 95% confidence interval for the population mean, based on the...
Based on the class sample, you will create a 95% confidence interval for the mean age and the proportion of males in the population of all online college students. Using the same sheet as part 2, answer the following in the "week 5"tab: . For the average age, form a 95% confidence interval: o What distribution should be used? What is the critical value? o What is the error bound? o What is the lower bound? o What is the...
Confidence Interval about a Population Mean 2) Consider the same information as in Example 2 on page 320, section 7.2, but use the following summary values instead: the sample size to be n = 15, the sample mean i = 30.2, and the sample standard deviation s = 2.40. The given summary statistics resulted from the raw data: 31, 29, 31, 26, 31, 32, 35, 28, 30, 27, 29, 29, 30, 32, and 34. Write your solution just like in...
Confidence Interval Given. Assume I created a 95% confidence interval for the mean hours studied for a test based on a random sample of 64 students. The lower bound of this interval was 4 and the upper bound was 14. Assume that when I created this interval I knew the population standard deviation. Using this information, (a) Calculate the width of the interval. (b) Calculate the margin of error for the interval. (c) Calculate the center of the interval. (d)...
Confidence Intervals 9. Construct a 95 % confidence interval for the population mean, . In a random sample of 32 computers, the mean repair cost was $143 with a sample standard deviation of $35 (Section 6.2) Margin of error, E. <με. Confidence Interval: O Suppose you did some research on repair costs for computers and found that the population standard deviation, a,- $35. Use the normal distribution to construct a 95% confidence interval the population mean, u. Compare the results....
10. Properties of a confidence interval Suppose the mean of a population is 22. A researcher (who does not know that p Then she constructs a 95% confidence interval of the population mean. 22) selects a random sample of size n from this population. The true population mean and the researcher's 95% confidence interval of the population mean are shown in the following graph. Use the graph to answer the questions that follow Sample Mean 95% Confidence interval of the...
Assume that you want to construct a 95% confidence interval estimate of a population mean. Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval. The sample standard deviation is given below. Margin of error =$5,standard deviation=$25 The required sample size is ????? (Round up to the nearest whole number as needed.)
21. Calculate the 95% Confidence interval around a sample mean of 100, based on a sample NE 25 with a (population standard deviation) o = 10. (4 points)
3. A 95% confidence interval for a population proportion yielded the interval (.245, .355). Compute the margin of error. Compute the sample proportion. Will a 99% confidence interval be wider or narrower? Explain why or why not.
А - B с D E F G H J K L Points 95% Confidence Interval for Average Age of Online College Students: 1 Age 2 3 4 5 Sample Mean: Sample St. Dev: Sample Size: 31.29 10.18 21.9 mil 1 6 7 2 Distribution: T-Distribution 2 Critical Value: *2 decimals 2 1 1 Margin of Error: Lower Bound: Upper Bound: *2 decimals Calculation: *2 decimals Calculation: *2 decimals Calculation: 2 Interpret 95% Confidence interval for Proportion of Male Online...
A 95% confidence interval for population mean of hemoglobin levels (g/(100 ml)) based upon a random sample of 36 male smokers is (22.68,26.73). Please provide a correct interpretation of the 95% Confidence interval (20 points)