There is concern about the speed of automobiles traveling over a particular stretch of highway. For a random sample of 28 automobiles, radar indicated the following speeds, in miles per hour:
Assuming a normal population distribution, find the margin of error of a 95% confidence interval for the mean speed of all automobiles traveling over this stretch of highway.
Answer to relevant QuestionsA clinic offers a weight-loss program. A review of its records found the following amounts of weight loss, in pounds, for a random sample of 24 of its clients at the conclusion of a 4-month program: a. Find a 99% confidence ...Calculate the confidence interval to estimate the population proportion for each of the following. a. 98% confidence level; n = 450; p` = 0.10 b. 95% confidence level; n = 240; p` = 0.01 c. α = 0.04; n = 265; p` = 0.50 Of a random sample of 250 marketing students, 180 rated a case of résumé inflation as unethical. Based on this information a statistician computed a confidence interval extending from 0.68 to 0.76 for the population ...LDS wants to be sure that the leak rate (in cubic centimeters per second) of transmission oil coolers (TOCs) meets the established specification limits. A random sample 50 TOCs is tested, and the leak rates are recorded in ...Assume simple random sampling. Calculate the confidence interval for the population total for each of the following. a. N = 1325; n = 121; s = 20; x = 182; 95% confidence level b. N = 2100; n = 144; s = 50; x = 1,325; 98% ...
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