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A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02 for the October 26 evening showing of the same movie for a sample of 25 purches the mean was $5.12 with a standard deviation of $2.14. The means appear to be very close, but, not the variances. At a- .05, is there a difference in variances? show all steps clearly, including an Illustration of the decision rule.
The following data represent the number of weed-eaters sold per month at a local garden shop and their prices
Suppose the population standard deviations are not the same. At.05 significance level, is there a difference in mean waiting time?
Based on the empirical data determine the following probabilities:
In a clinical study of an allergy drug, 108 of the 203 subjects reported experiencing significant relief from their symptoms. Using a significance level of .01, test the claim that more than half of all those using the drug experienced relief.
Ace Machine Works estimates that the probability its lathe tool is properly adjusted is 0.8. When the lathe is properly adjusted, there is a 0.9 probability that the parts produced pass inspection.
An investment firm with 10,000 clients would like to accurately forecast the average dollar amount their current customer will deposit over the coming year.
Construct the payoff table for this decision situation. Compute the expected value of each alternative amount of milk that could be stocked, and select the best decision.
Let X equal the weight in grams of a 52-gram snack pack of candies. Assume that the distribution of X is N(μ, 4). A random sample of n = 10 observations of X yielded the following data:
The estimate of the population proportion is to be within plus or minus .10, with a 99 percent level of confidence. The best estimate of the population proportion is .45. How large a sample is required?
An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent.
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.
You are dealt 2 cards successively without replacement from a shuffled deck of 52 cards. Find the probability that the first card is a king and the second card is a queen.
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