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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 Spring '08
 Priya
 Standard Deviation, Specific Motors

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