Concept explainers
In Exercises 1–3, refer to the accompanying screen display that results from the Verizon airport data speeds (Mbps) from Data Set 32 “Airport Data Speeds” in Appendix B. The confidence level of 95% was used.
1. Airport Data Speeds Refer to the accompanying screen display.
a. Express the confidence interval in the format that uses the “less than” symbol. Given that the original listed data use one decimal place, round the confidence interval limits accordingly.
b. Identify the best point estimate of μ and the margin of error.
c. In constructing the confidence
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- A researcher collected data on the annual salary of doctors in Illinois.He wishes to construct a confidence interval for the mean annual salary. Which of the following are true? I. A 98% confidence interval will have a greater chance of including the true mean salary than a 95% confidence interval.II. A 98% confidence interval will be narrower than a 95% confidence interval.III. A 98% confidence interval requires the researcher to take a larger sample. Choose the best answer below: A, II, III B. I C. III D. I, II E. IIarrow_forwardWhich of the following describes the function of a confidence interval? Select one: a. It uses a sample mean to estimate the population mean b. It uses a population mean to predict a sample mean c. It uses a level of confidence to estimate a sample mean d. It uses the sample mean to determine a level of confidence for an effectarrow_forwardRefer to the accompanying data display that results from a sample of airport data speeds in Mbps. The results in the screen display are based on a 95% confidence level. Write a statement that correctly interprets the confidence interval. Choose the correct answer below. OA. The limits of 13.05 Mbps and 22.15 Mbps contain the true value of the mean of the population of all data speeds at the airports. OB. We have 95% confidence that the limits of 13.05 Mbps and 22.15 Mbps contain the true value of the mean of the population of all data speeds at the airports. C. The limits of 13.05 Mbps and 22.15 Mbps contain 95% of all of the data speeds at the airports. OD. We have 95% confidence that the limits of 13.05 Mbps and 22.15 Mbps contain the sample mean of the data speeds at the airports. Tinterval (13.046,22.15) x = 17.598 Sx 16.01712719 n = 50arrow_forward
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