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A large university reports that the mean annual income of parents of an entering class is $91,600. To see how this compares to his university, the president commissions a survey of n = 31 randomly selected families, and finds that their average income is x = $88,500 with a sample standard deviation of s = $10,000. Can the president conclude that the average family income at his school is significantly different than the population mean family income of the reported university?
If 20 measurements are taken and their standard deviation is 1.8, is there enough evidence to reject the claim that her standard deviation is within the limit at ∞ = .01?
Between 180 and 230 (inclusive) of the drivers in the sample regularly wear a seatbelt? Hint: Use the BINOMDIST function in Excel.
Obtain a test statistic and p -value assuming equal variances. Interpret these results.
Chocolate chip cookies resulted in the following calorie amounts. At the a _ 0.01 level, is there sufficient evidence that the average calorie content is greater than 110 calories?
A sample of 45 overweight men participated in an exercise program. At the conclusion of the program 32 had lost weight. At the .05 significance level, can we conclude the program is effective?
Determine sample size requirements. When the results are available you would like your margin of error to be plus or minus 5% for the satisfaction measure and plus or minus $1.50 for the spending value.
A test of 45 capsules had a mean weight of 20.9 milligrams and a standard deviation of 0.3 milligrams. Test the makers claim at the 95% confidence level.
A salesman must select 2 of the first component and 3 of the second to take on a sales call. How many different systems can the salesman select?
If Household is selected at random, find out the probability that it feels economic conditions are good?
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
If one of these consumers is randomly selected, what is the probability that the person prefers design A and is under 25?
Find out the probability distribution, and the cumulative probability distribution of car arrivals.
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