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Since the emergence of Japan as an industrial superpower in the 1970s and 1980s, U.S. businesses have paid close attention to Japanese management styles and philosophies. Some of the credit for the high quality of Japanese products is attributed to the Japanese system of permanent employment for their workers. In the United States, high job turnover rates are common in many industries and are associated with high product defect rates. High turnover rates mean U.S. plants have more inexperienced workers who are unfamiliar with the company's product lines than Japan has. For example, in a study of the air conditioner industry in Japan and the United States, the difference in the average annual turnover rate of workers between U.S. plants and Japanese plants was reported as 3.1%. In a more recent study, five Japanese and five U.S. plants that manufacture air conditioners were randomly sampled; their turnover rates are shown below.U.S. Plants Japanese Plants
7.11 3.52
6.06 2.02
8.00 4.91
6.87 3.22
4.77 1.92
Is there sufficient evidence to indicate that the mean annual percentage turnover for U.S. plants exceeds the corresponding mean percentage for Japanese plants? Test using α = .05. This is a t-test: Two-sample independent groups assuming equal variances.
Change the last number in that set from 36 to 14 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
In a hospital, a sample of 8 weeks was selected, and it was found that an average of 438 patients was treated in the emergency room each week. The standard deviation was 16. Find the 99% confidence interval of the true mean. Assume the variable is..
Determine future value of annuity due which has $750 deposited at the starting of each month for 15 years at 5.9% compounded monthly.
Survey on marital status to determine whether the data is qualitative or quantitative
The following data are based on information from Domestic affairs. Let X be the average number of employees in a group helh insurance plan, and let Y be the average administrative cost as a percentage of claims.
A study of elephants is conducted to determine the average weight of a certain subspecies of elephants. The standard deviation for the population is 500 pounds.
The relationship between energy consumption and average car gas mileage, controlling for GDP.
There is sufficient evidence to support the claim that the mean speed of all cars on that section of I-10 is greater than the posted speed limit of 70 mph.
Explain why comparing children whose parents chose a Montessori school with children of other parents would not show whether Montessori schools perform better than other programs?
For any distribution the score that separates the highest 10% from the rest of scores is called.
Note that Σ x = 2233 and Σ x 2 = 138,053. At the 5% level of significance, can the instructor conclude that the new mean is different from 64?
The following estimated regression model was developed relating yearly income (Y in $1,000s) of 30 individuals with their age (X 1 ) and their gender (X 2 ) (0 if male and 1 if female).
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