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During the 3pm to 5pm time period, cars arrive at a banks drive through window at an average rate of 15 customers per hour. Asuume that the time between arrivals follows the expotentional distribution. What is the probability that a randomly selected customer will arrive between 2 and 6 minutes after the previous customer?
in the last quarter of 2007 a group of 64 mutual funds had a mean return of 4.8 with a standard deviation of 5.5. if
the monthly starting salaries of students who receive an mba degree have a population standard deviation of 110. what
compute the mean median mode and standard deviation for the following discrete probability distribution.value of
testing for population proportion -the personnel director of a large insurance company is interested in reducing the
Assume that ages at onset of this disease are normally distributed for each gender, do not assume the population variances are equal. What are the appropriate null and alternative hypotheses?
What sample size would be necessary to estimate the true weight with an error of +/- 0.03 grams with 90 percent confidence?
In how many ways can at least one of the 3 selected vials have a hairline crack if the order of selection does not matter?
Give all steps of a test of the hypothesis that the corresponding population proportions are equal.
The distribution of meansdistribution and the distribution of means, showing the t score and cutoff points for significance. (c) Explain your answer to someone who has never taken a course in statistics.
inclusions are defects in poured metal caused by contaminants. the number of large inclusions in cast iron follows a
A statistic practitioner working for Major League Baseball determined the probability that the hitter will be out on ground balls is .75. in a game where there are 20 ground balls, find the probability that all of them were out.
the national center for education statistics reported that mean number of instructional computers per public school
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