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For each of the following three populations, indicate what the sampling distribution for samples of 25 would consist of:
a) Travel expense vouchers for a university in an academic year.b) Absentee records (days absent per year) in 2009 for employees of a large manufacturing company.c) Yearly sales (in gallons) of unleaded gasoline at service stations located in a particular state
Is there evidence that teams with higher total payrolls tend to be more successful? Justify your answer.
If you were to roll a single die 10 times, the result of each roll would be __________. A) Mutually exclusive of the other nine rolls B) Proportional to the other nine rolls C) Dependent upon the other nine rolls D) Independent of the other nine roll..
A United Nations report shows the mean family income for Mexican migrants to the U.S.. is $27,000 per year. A FLOC evaluation of a sample 25 Mexican families units reveals a mean to be $30,000 with a sample standard deviation of $10,000.
the null hypothesis is to be tested at 95% confidence. Determine the critical value(s) for this test.
Suppose the investor is to invest a total of $10,000, what is the expected value of perfect information for investor.
A point estimate for the difference between the mean purchases of the users of the two credit cards is:
What role do z-scores play in this transformation of data from multiple distributions to the standard normal distribution? What is the relationship between z-scores and percentages?
Can it be concluded that, X, number of boys in two-child families of preeminent scholars, is binomiallydistributed? Let α=0.05.
This test result prompts a state administrator to declare that the mean score for the sate's eighth graders on the examination is more than 275. at a=.04, is there enough evidence to support the claim.
Suppose that in order to satisfy legal requirements, a meat pie manufacturer may only produce .2% of pies below a weight of 750grams. If the preceding holds and if the weight of all pies is normally distributed with a standard deviation of 50 gram..
Ace Jack had no idea whether the $100,000 he pays for training for his used car salespeople works.
A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not?
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