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For large U.S. companies, what percentage of their total income comes from foreign sales?
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For large U.S. companies, what percentage of their total income comes

from foreign sales? A random sample of technology companies (IBM, Hewlett-Packard, Intel, and others) gave the following information.†
Technology companies, % foreign revenue: x1; n1 =16
62.8 55.7 47.0 59.6 55.3 41.0 65.1 51.1
53.4 50.8 48.5 44.6 49.4 61.2 39.3 41.8


Another independent random sample of basic consumer product companies (Goodyear, Sarah Lee, H.J. Heinz, Toys 'R' Us) gave the following information.
Basic consumer product companies,% foreign revenue: x2; n2 =17
28.0 30.5 34.2 50.3 11.1 28.8 40.0 44.9
40.7 60.1 23.1 21.3 42.8 18.0 36.9 28.0 32.5


Assume that the distributions of percentage foreign revenue are mound-shaped and symmetric for these two company types.
(a) Use a calculator with mean and standard deviation keys to calculate x1, s1, x2, and s2. (Round your answers to two decimal places.)
x1 = ______%
s1 = _______ %
x2 = _______%
s2 = _______ %


(b) Let μ1 be the population mean for x1 and let μ2 be the population mean for x2. Find a 90% confidence interval for μ1 − μ2. (Round your answers to two decimal places.)
lower limit _______   %
upper limit _________%

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