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 = 1662.855.747.059.655.341.065.151.153.450.848.544.649.461.239.341.8Another 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 = 1728.030.534.250.311.128.840.044.940.760.123.121.342.818.036.928.032.5Assume 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 four decimal places.)x1 = %s1 = %x2 = %s2 = %(b) Let ?1 be the population mean for x1 and let ?2 be the population mean for x2. Find an 80% confidence interval for ?1 − ?2. (Round your answers to two decimal places.)lower limit =__ %upper limit =__%

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Answered: For large U.S. companies, what…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

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 four decimal places.)

x₁ =	%
s₁ =	%
x₂ =	%
s₂ =	%

(b) Let ?₁ be the population mean for x₁ and let ?₂ be the population mean for x₂. Find an 80% confidence interval for ?₁ − ?₂. (Round your answers to two decimal places.)