ssume 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 126 with 89.7% successes at a confidence level of 98%. M.E. = % Report answer accurate to one decimal place (as a number of percentage points). Answer should be obtained without any preliminary rounding (however, the critical value may be rounded to 3 decimal places).

In order to estimate the proportion of women over 50 who have annual mammograms with a 95% confidence interval within -+0.05, how many women must you interview? Assume that you have no idea what the true proportion might be. Show your work and box answer.

You want to estimate the mean weight of quarters in circulation. A sample of 60 quarters has a mean weight of 5.682 grams and a standard deviation of 0.061 gram. Use a single value to estimate the mean weight of all quarters. Also, find the 95% confidence interval for the average weight of all quarters. The estimate for the mean weight of all quarters is (Round to three decimal places as needed.) grams. Find the 95% confidence interval for the mean weight of all quarters. grams < p< grams (Round to three decimal places as needed.)

Determine the sample size required to estimate a population mean to within 11 units given that the population standard deviation is 50. Use a confidence level of 95%. Sample Size =

You want to estimate the mean weight of quarters in circulation. A sample of 50 quarters has a mean weight of 5.658 grams and a standard deviation of 0.064 gram. Use a single value to estimate the mean weight of all quarters. Also, find the 95% confidence interval for the average weight of all quarters. grams. The estimate for the mean weight of all quarters is (Round to three decimal places as needed.) Find the 95% confidence interval for the mean weight of all quarters. grams<μ< grams (Round to three decimal places as needed.)

A different I/O psychologist wants to know if there is a difference in worker evaluations depending if the employee is a male or female.  A group of managers were recruited and each rated both 15 men and 15 women employee evaluations on a scale of 0-10.  The ratings on the worker evaluations were recorded for each manager.  Which statistical test would be best to determine if there is a significant difference between groups?     one-sample t-test     dependent samples t-test           ANOVA

ou intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 6.a.) The degrees of freedom df=df=b.) Use the t-table on page 4 to find the critical value tctc that corresponds to a confidence level of 95%.tc=(Use 4 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 of size 149 with 83.9% successes at a confidence level of 99.5%. M.E. = 0.084 X% Report answer accurate to one decimal place (as a number of percentage points). Answer should be obtained without any preliminary rounding (however, the critical value may be rounded to 3 decimal places).

The operations manager of a large production plant would like to estimate the average amount of time workers take to assemble a new electronic component. After observing a number of workers assembling similar devices, she guesses that the standard deviation is 6 minutes. How large a sample of workers should she take if she wishes to estimate the mean assembly time to within 18 seconds. Assume the confidence level to be 91%. Sample Size =

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 354 with 96 successes at a confidence level of 80%. 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.