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According to the IRS, the average tax refund for the 70 million personal income tax returns in 1998 was $800. Assuming a standard deviation of $220, find the probability that for a random sample of 49 returns, the mean refund is between $700 $900.
Find out the confidence interval for the population mean also interpret the result. A researcher is interested in whether social assertiveness might be influenced by training procedures.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
Selecting a Staff Person: At a community swimming pool there are 2 managers, 8 lifeguards, 3 concession stand clerks, and 2 maintenance people. If a person is selected at random, find the probability that the person is either a lifeguard or a mana..
Assume that the two tests use different scales to measure the same aptitude. If someone gets a SAT score that is the 67th percentile, find the actual score and the equivalent ACT score.
Using the six-step critical value approach, at the 0.05 level of significance, is there evidence that the population mean delivery time has been reduced below the previous population mean value of 20 minutes?
a survey found that womens heights are normally distributed with a mean 62.2 in and standard deviations 2.5 in the
1. suppose you are calculating an analysis of variance for a completely randomized design. you are testing the
q1.what are the four essential requirements of a distance measure as might be used in cluster analysis multidimensional
If you choose 12 vehicles at random, what is the probability that more than half(that is, 7 or more) carry just one person?)create a probability distribution table and a cumulative distribution.
when an opinion poll calls residential telephone numbers at random only 20 of the calls reach a live person. you watch
a statistics class at wilmington college has 25 students of which 15 are math majors and 10 are business majors. the
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