Author Question: Suppose a department store wants to estimate the mean age of the customers of its contemporary ... (Read 111 times)

abc · **on:** Jun 24, 2018

Suppose a department store wants to estimate the mean age of the customers of its contemporary apparel department, correct to within 2 years, with level of confidence equal to 95. Management believes that the standard deviation is 8 years. The sample size they should take is ________.

Fill in the blank(s) with correct word

Question 2

As an aid to the establishment of personnel requirements, the director of a hospital wishes to estimate the mean number of people who are admitted to the emergency room during a 24-hour period. The director randomly selects 64 different 24-hour periods and determines the number of admissions for each. For this sample, = 396 and S = 100. Using the sample standard deviation as an estimate for the population standard deviation, what size sample should the director choose if she wishes to estimate the mean number of admissions per 24-hour period to within 1 admission with 99 reliability?

What will be an ideal response?

BAOCHAU2803 · **Reply #1 on:** Jun 24, 2018

Answer to Question 1

62

Answer to Question 2

n = 166
Note: The answer is computed using Z = 2.575 from Table E.2 or Z = 2.5758293 using PHStat.