Use the sample data to construct a 95​% confidence interval estimate of the population standard deviation.

The current speed limit is 60 mph. This sample of speeds was taken at 4pm on a Monday. Use the data to construct a 80% confidence interval estimate of the standard deviation for the population speeds.  60  62  62  65  56  62  54  61  60  61  69  58  66 what is the lower limit what is the upper limit

In a random sample of 60 refrigerators, the mean repair cost was $111.00 and the population standard deviation is $16.40. Construct a 95% confidence interval for the population mean repair cost. Interpret the results. Construct a 95% confidence interval for the population mean repair cost. The 95% confidence interval is ( D. (Round to two decimal places as needed.)

## In a survey of adults with diabetes, the average body mass index (BMI) in a sample of 1938 women was 32.2 with a standard deviation of 0.03. The BMI in a sample of 1555 men was 30.4, with a standard deviation of 0.06. Construct a 92% confidence interval for the difference in the mean BMI between women and men with diabetes,  INTERPRET THE RESULTS. DOES THE CONFIDENCE INTERVAL CONTRADICT THE CLAIM THAT THE MEAN BMI IS THE SAME FOR BOTH MEN AND WOMEN WITH DIABETES?

You are given the sample mean and the population standard deviation. Use this information to construct the​ 90% and​ 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.  From a random sample of 80 ​dates, the mean record high daily temperature in a certain city has a mean of 83.78°F. Assume the population standard deviation is 14.92°F. The​ 90% confidence interval is ​(enter your response here​,enter your response here​). ​(Round to two decimal places as​ needed.)

A researcher is interested in estimating the mean weight of a semi trailer truck to determine the potential load capacity. She takes a random sample of 17 trucks and computes a sample mean of 20,000 pounds with sample standard deviation of 1,500. The 95% confidence interval for the population mean weight of a semi trailer truck is ______________. 19,232 to 20,768 19,367 to 20,633 19,229 to 20,771 18,500 to 21,500 19,365 to 20,635

Researchers studied the mean egg length (in millimeters) for a bird population. After taking a random sample of eggs, they obtained a 95% confidence interval of (45,60). What is the value of the margin of error? Choose the correct answer below. A. 15 mm B. 52.5 mm O c. 7.5 mm O D. 1.96

In a random sample of ten people, the mean driving distance to work was 25.5 miles and the standard deviation was 7.3 miles. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 90% confidence interval for the population mean μ. Interpret the results. Identify the margin of error. (Round to one decimal place as needed.) Construct a 90% confidence interval for the population mean. (...) (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) OA. % of all random samples of ten people from the population will have a mean driving distance to work (in miles) that is between the interval's endpoints. OB. It can be said that % of the population has a driving distance to work (in miles) that is between the interval's endpoints. OC. With % confidence, it can be said that most driving distances to…

A consumer advocate analyses the nicotine content in some brand of cigarettes. A sample of 20 cigarettes of that Brand was analyzed which resulted in mean of 1.68mg. It is known that population standard deviation is 18. Nicotine content is assumed to be normally distributed. Find the 90% confidence interval for the true average nicotine content in that brand of cigarettes. (clearly write down the formula first and then calculate)Also, Interpret the meaning of confidence interval.

You are interested in estimating the the mean weight of the local adult population of female white-tailed deer (doe). From past data, you estimate that the standard deviation of all adult female white-tailed deer in this region to be 17 pounds. What sample size would you need to in order to estimate the mean weight of all female white-tailed deer, with a 96% confidence level, to within 7 pounds of the actual weight? Sample Size: