Assume that a sample is used to estimate a population proportion u. Find the margin of error M.E. that corresponds to a sample of size 22 with a mean of 82.3 and a standard deviation of 6.9 at a confidence level of 99.9%. Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. М.Е. . %3 Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

To compare the dry braking distances from 30 to 0 miles per hour for two makes of​ automobiles, a safety engineer conducts braking tests for 35 models of Make A and 35 models of Make B. The mean braking distance for Make A is 43 feet. Assume the population standard deviation is 4.6 feet. The mean braking distance for Make B is 46 feet. Assume the population standard deviation is 4.5 feet. At α=0.10​, can the engineer support the claim that the mean braking distances are different for the two makes of​ automobiles? Assume the samples are random and​ independent, and the populations are normally distributed.   The critical​ value(s) is/are   Find the standardized test statistic z for μ1−μ2.

True or False  4)  The standard deviation describes the differences between x. 5)  Keep other factors constant, the standard error with a sample size of 50 islarger than the standard error with a sample size of 100. 6)  Keeping other factors constant, the 90% CI has a broader range with a samplesize of 50 than with a sample size of 100. 7)  Keeping other factors constant, the 99% CI has a broader range than the 95% CI.

Suppose that a researcher is interested in estimating the mean systolic blood pressure, μ, of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate μ. Assuming that the standard deviation of the population of systolic blood pressures of executives of major corporations is 26mm Hg, what is the minimum sample size needed for the researcher to be 95% confident that his estimate is within 5mm Hg of μ? Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).

Assume that a sample is used to estimate a population mean μ. Find the margin of error M.E. that corresponds to a sample of size 13 with a mean of 62.6 and a standard deviation of 6.9 at a confidence level of 99%. Report ME accurate to one decimal place because the sample statistics are presented with this accuracy.M.E. =  Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

Assume that a sample is used to estimate a population mean u. Find the margin of error M.E. that corresponds to a sample of size 10 with a mean of 48.3 and a standard deviation of 5.9 at a confidence level of 99.9%. Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. М.Е. 3D Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

Assume that a sample is used to estimate a population proportion μ. Find the margin of error M.E. that corresponds to a sample of size 50 with a mean of 36.5 and a standard deviation of 11.3 at a confidence level of 80%.Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. M.E. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

A population has a standard deviation of 8. What is the minimum sample size needed to estimate a mean to within 2 units with 66.8% confidence? O A. 13 О В. 15 ОС. 12 O D. 16 O E. 14

Assume that a sample is used to estimate a population mean μ. Find the margin of error M.E. that corresponds to a sample of size 5 with a mean of 60.6 and a standard deviation of 12.1 at a confidence level of 80%.Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. M.E. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.