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masya89 [10]
3 years ago
14

Annual starting salaries for college graduates with degrees in business administration are generally expected to be between 3000

0 and 50000. Assume that a 95% confidence interval estimate of the population mean annual starting salary is desired. 1. What is the planning value for the population standard deviation?2. How large a sample should be taken if the desired margin of error is
a. $500?
b. $200?
c. $100?
3. Would you recommend trying to obtain the $100 margin of error? Explain.
Business
1 answer:
olga55 [171]3 years ago
8 0

Answer:

(1) The planning value for the population standard deviation:

=\frac{50,000-30,000}{4}

= 5,000

(2) Given a = 0.05, Z(0.025) = 1.96 (from standard normal table)

n = (\frac{Z\times SD}{Error}) ^{2}

(a)

n = (\frac{1.96\times 5,000}{500}) ^{2}

n = 384.16

(b)

n = (\frac{1.96\times 5,000}{200}) ^{2}

n = 2,401

(c)

n = (\frac{1.96\times 5,000}{100}) ^{2}

n = 9,604

(3) No, because the sample size of the study is too larger.

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