MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Insurance Company A claims that its customers pay less for car insurance, on average, than customers of its competitor, Company B. You wonder if this is true, so you decide to compare the average monthly costs of similar insurance policies from the two companies. For a random sample of 11 people who buy insurance from Company A, the mean cost is $150 per month with a standard deviation of $12. For 13randomly selected customers of Company B, you find that they pay a mean of $159 per month with a standard deviation of $18. Assume that both populations are approximately normal and that the population variances are equal to test Company A’s claim at the 0.10 level of significance. Let customers of Company A be Population 1 and let customers of Company B be Population 2.
Step 1 of 3:
State the null and alternative hypotheses for the test. Fill in the blank below.
H0: μ1=μ2:
H0: μ1=μ2:
Ha: μ1__μ2
Step 2 of 3:
Compute the value of the test statistic. Round your answer to three decimal places.
Step 3 of 3:
Draw a conclusion and interpret the decision.
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