MGMT305-Lec7

# Slide 28 example5expressdeliveries

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Unformatted text preview: stance of Par, Inc. golf balls is greater than the mean driving distance of Rap, Ltd. golf balls? µ1 = mean distance for the population of Par, Inc. golf balls µ2 = mean distance for the population of Rap, Ltd. golf balls (a) What are the Hypotheses H0 and Ha? Slide 23 Example 3: Par, Inc. (b) Compute the Test Statistic. (c) What is the conclusion? We are at least 99% confident that the mean driving distance of Par, Inc. golf balls is greater than the mean driving distance of Rap, Ltd. golf balls. Slide 24 Example 4: Specific Motors Specific Motors of Detroit has developed a new automobile known as the M car. 12 M cars and 8 J cars (from Japan) were road tested to compare miles­per­ gallon (mpg) performance. The sample statistics are: Sample Size Mean Standard Deviation Sample #1 Sample #2 M Cars J Cars n1 = 12 cars n2 = 8 cars x1 x2 = 29.8 mpg = 27.3 mpg s1 = 2.56 mpg s2 = 1.81 mpg Slide 25 Example 4: Specific Motors Q. Can we conclude, using a .05 level of significance, that the miles­per­gallon (mpg) performance of M cars is greater than the miles­per­gallon performance of J cars? µ1 = mean mpg for the population of M cars µ2 = mean mpg for the population of J cars (a) What are the Hypotheses H0 and Ha? Slide 26 Example 4: Specific Motors (b) Find the Test Statistic (c) What is the conclusion? We are at least 95% confident that the mean mpg of M cars is greater than the mean mpg of J cars. Slide 27 Inference About the Difference Between the Means of Two Populations: Matched Samples s With a matched­sample design each sampled item provides a pair of data values. s By considering the difference of each pair of the data values, we can...
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