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The mean length of the work week for the population of American workers was reported to be 39.2 hours with a standard deviation of 4.8 hours in September, 2000. A researcher wants to determine if the average work week has changed from 39.2 hours. A sample of 112 workers yielded a mean of 38.5 hours. Based on this sample, can we conclude at the 5% significance level that the average length of the work week has changed?
A. State the null and alternate hypotheses
B. Identify the test statistic
C. State the decision rule.
D. Show the appropriate calculations and state the statistical decision.
E. What conclusions can you draw concerning the length of work week for the population of American workers?
How did round trip transactions violatet the revenue recognition principle?
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define standard deviation. their purpose,uses,advantages nd disadvantages,examples ,formula for grouped and ungrouped.
Test the claim that 10% of a candy makers candies are red. Use a 0.05 significance and the table to answer the following questions: Find the proportion of the candies that are red?
In a suburban community, 30% of the households use Brand A toothpaste, 27% use Brand B, 25% use Brand C, and 18% use Brand D. In the four groups of households, the proportions of r
one two
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(39.75-(39)/2/(sqrt+25))
The researcher and the respondents do not come in contact with each other if this method of survey is adopted Questionnaires are mailed to the respondents with a request to re
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