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Finance: P/E Ratio The price of a share of stock divided by a company's estimated future earnings per share is called the P/E ratio. High P/E ratios usually indicate "growth" stocks, or maybe stocks that are simply overpriced. Low P/E ratios indicate "value'' stocks or bargain stocks. A random sample of 51 of the largest companies in the United States gave the following P/E ratios (Reference: Forbes).
11
35
19
13
15
21
40
18
60
72
9
20
29
53
16
26
14
27
10
12
47
33
17
25
23
5
8
49
44
31
67
51
32
(a) Use a calculator with mean and sample standard deviation keys to verify that x = 25.2 and s = 15.5.
(b) Find a 90% confidence interval for the P/E population mean m of all large
U.S. companies.
(c) Find a 99% confidence interval for the P/E population mean m of all large
(d) Interpretation Bank One (now merged with J.P. Morgan) had a P/E of 12, AT&T Wireless had a P/E of 72, and Disney had a P/E of 24. Examine the confidence intervals in parts (b) and (c). How would you describe these stocks at the time the sample was taken?
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