Assume that a sample is used to estimate a population proportion p. Find the margin of error M.E. that corresponds to a sample of size 145 with 39 successes at a confidence level of 90%. M.E. =_____ % (report answer accurate to one decimal place; answer should be reported as a percent, not a decimal—though do not type the percent sign) 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 (p). Find the margin of error (M. E), that corresponds to a sample size 372 with 189 successes at a confidence level of 99% M.E = Z value may be round to 3 decimal places and M.E round to 2 decimals

Suppose that for a test of proportion we have :p=0.5 and . The test statistic z=1.53 and the p-value is reported as P-value = 0.063. Find the error in the reasoning.     This is a right-tailed test so the P-value should be 0.9370.     This is a two-tailed test so the P-value should be 0.126.     The P-value should have been calculated using the studentâ s t-distribution.     There is no error in the reasoning.     None of these.

A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 3 points with 99% confidence assuming s=17.8 based on earlier​ studies? Suppose the doctor would be content with 99% confidence. How does the decrease in confidence affect the sample size​ required? a. A​ 99% confidence level requires _______ subject. b. 90% confidence level requires ________ subject. c.How does the decrease in confidence affect the sample size​ required? a.Decreasing the confidence level decreases the sample size needed.   b.Decreasing the confidence level increases the sample size needed.   c.The sample size is the same for all levels of confidence.