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Tax companies imply that the returns they prepare are perfect, but what proportion of returns from tax companies have mistakes? To answer this question, a random sample of 150 tax returns prepared by tax companies was selected. Among these returns, 42 were found to contain at least one mistake. You may assume the method is valid for this exercise.
you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a one sample or two sample test?
Determine whether the method of delivering teaching influences adherence with antiretroviral therapy.
Mean 1400 grams and standard deviation 20 grams. Find positive numbers a and b such that Y=a+bX has a mean 0 and standard deviation.
How many subjects are needed to estimate the number of books read the previous year within one book with 99% confidence?
Explain the implications of this statement in the context of ordinary least squares regression? Be sure your answer includes a discussion of hypothesis testing.
The following confidence interval is obtained for a population proportion, p:(0.458, 0.490). Use these confidence interval limits to find the point estimate, p-hat.
It would like to be plus or minus $10 of the true mean with a 98% confidence level. The standard deviation is thought to be $500. How many card holders should be sampled?
Find the average caller "on hold" time if the company maintains that no more than 9% of callers wait more than 6.6 minutes.
Find the probability that a man and woman are watching the schow at the same time. (This question confused me because it sounds like the statement I just wrote before this one)
Suppose that a random sample of 14 cars shows an average speed of 24.0 mph, with a sample standard deviation of 2.2 mph. Assume that the speeds of cars are normally distributed. Using the T-table, what is the p-value?
Find the z score for a raw score of 550 given the following information: 554 sample mean, 30 sample standard deviation.
The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages. (a) At the .01 level of significance, is the true mean greater than 10? (b) Use Excel to find the..
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