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Given the following frequency distribution, find out the mean, variance, and standard deviation.
Class | Frequency
61-63 | 21
64-66 | 25
67-69 | 20
70-72 | 14
73-75 | 21
Is it reasonable typical worker does not miss any days during a pay period?
Test hypothesis that Site B is more successful in initiating acquaintances than Site A. Use alpha = .05.
Set up null hypothesis for associated F test.
Two independent samples of sizes n1 = 50 and n2 = 50 are randomly selected from two populations to test the difference between the population means. The sampling distribution of the sample mean difference, is:
Girl B throws 15 times, with a prob. of success = 0.2. And girl C throws 20 times, with a probability of success equal to 0.1. Determine the probability that the target will get hit at least 12 times.
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
What would be the critical value under the null hypothesis if the size of your test were 5%?
At.01 significance level, is there difference in mean number of times men and women order take-out dinners in month? Determine the p -value?
What is the maximum error of estimate for p ?
Sketch the areas under the standard normal curve over the indicated intervals, and find the specified areas.
Findout the margin of error for this survey if we want a 99 percent confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
Utlizing binomial approximation to normal finding the normal model. A grower claims that only 13 percent of the strawberries he grows are unsatisfactory.
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