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From the data bank, select a random sample of 30 individuals.
a. Use the z test to test the hypothesis for IQ that u= 100. Use a = .05.
b. Repeat problem a using the t-test.
c. Do you get the same results?
d. Which test is appropriate?
The American Automobile Association checks the prices of gasoline before many holiday weekends. Listed below are the self-service prices for a sample of 15 retail outlets during the May 2003 Memorial Day weekend in the Detroit
The researchers found that subjects who answered immediately made the best decisions and that "the longer our participants thought about their answers, the more likely they were to include irrelevant information at the expense of relevant informat..
If 15 golfers have checked in using this process, what is the expected number and standard deviation of no-shows among these golfers? (Show computations)
131 are enrolled in both economics and mathematics course. Determine the probability that freshman selected at random from group is enrolled in each of the following?
A recent study at a local college claimed that the proportion of students who commute more than fifteen miles to school is no more than 25%.
The mean was 56 and the standard deviation was 20. On the second exam, she scored 82; the mean was 74 and the standard deviation was 5. On which exam did she do better?
All but one of the following statements contain a blunder. Which one does not contain a blunder
A small town has a population of 20,000 people. Among these, 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
Compute the mean and variance of the following discrete probability distribution.
a quality control technician is checking the weights of a product. she takes a random sample of 8 units and weighs each
An industrial chemical to retard the spread of fire in paint has been developed. From past experience, 48% of sales calls will result in an order.
Thomas is going to make an open-top box by cutting equal squares from the four corners of an 11 inch by 14 inch sheet of cardboard and folding up the sides.
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