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It is asserted that a greater proportion of males (= x 1 ) contribute to charity than females (= x 2 ). A survey of male and female contributors to charity showed that of 900 males surveyed, 86 contributed to charity, and of 1200 females surveyed, 107 contributed to charity. Assume the sample statistics are from random, independent samples.
State the Null, and Alternative , hypotheses to be tested, noting whether the test is a right-tailed, left-tailed , or two tailed test and test the hypothesis that the proportion of charitable givers are the same for both males and females. Test at the level alpha = 0.05.
Find the distribution of the test statistic when the null hypothesis is true, and then show how to get a test size alpha= 0.10
We are interested in determining whether or not the variances of the sales at two music stores (A & B) are equal. A sample of 10 days of sales at store A has a standard deviation of 30, while a sample of 16 days of sales from store B has a standar..
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Find a 95% confidence interval for the mean daily caloric intake. Interpret this interval.
What is the total expected annual inventory cost at the optimal order quantity? What is the re-order point?
Explain the differences between qualitative and judgmental statistical time-series, and explanatory/causal forecasting models.
If we select a crew member at random, what is the probability the crew member earns:
Sprinkler Systems. A manufacturer of sprinkler systems designed for fire protection claims that the average activating temperature is at least 135 degrees F.
A microwave oven repairer says that the mean repair cost for damaged microwave oven is less than $90. You work for the repairer and want to test this claim.
The yield strength of a metal bolt has a mean of 6,050 pounds with a standard deviation of 100 pounds. Twenty samples of three bolts were tested, resulting in the means shown below.
r. Patton is a professor of English. Recently she counted the number of misspelled words in a group of student essays. She noted the distribution of misspelled words per essay followed the normal distribution with a standard deviation of 2.44 word..
Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course:
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