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At a certain university, the average cost of books was $370 per student last semester and the population standard deviation was $90. This semester a sample of 45 students revealed an average cost of books of $395 per student. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis.
From past estimates, manager thinks that about 4% of customers have expressed dissatisfaction. What sample size must you use for this survey?
Random sample of 150 viewers last night revealed 53 watched news on WNAE, 64 watched on WRRN, and 33 on WSPD. At .05 significance level, is there a difference in proportion of viewers watching three channels?
Determine the probability of choosing at random license plate which ends in the even number?
What is the probability that a cereal would be high calorie, given that is low fiber? In other words, what is P (high calorie, given low fiber)?
A sample of 50 male and 50 female infants were put on an experimental infant formula. After two weeks the parents of each infant were asked to fill out a questionnaire concerning infant satisfaction on the formula. One of the questions was "Did Ba..
Please state the null and alternative hypothesis in symbols and in words. Compare the P-value to the Level of Significance. Do you accept or reject Ho.
Prof Hardtack gave three exams last semester in a large lecture class. The standard deviation = 7 was the same on all three exams, and scores were normally distributed.
In a normal frequency distribution, 32% of the cases:
Separately choose at random 2 of those under 21 to interview about attitudes toward alcohol. You have given every student at the party the same chance to be interviewed: what is that chance?
As a sample size approaches infinity, how does the student's t distribution compare to the normal z distribution? When a researcher draws a sample from a normal distribution, what can one conclude about the sample distribution? Explain.
Suppose that data is recorded for equal period of "before"-"after" time. Use 1% level for risk. Given processed data, explain what John must do.
What is probability of selecting 2 families neither had taxes prepared by H&R Block?
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