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Question: The scores on the final exam in a course with a large number of students have approximately a bell-shaped distribution. The mean score was 70, the highest score was 98, and the lowest score was 41.
a. Find the value of the range for the exam scores.
b. Refer to part (a). Use the value of the range to estimate the value of the standard deviation.
Given the probability function R(x) = 0.2 for x = 0, 1, 2, 3, 4, find the mean and standard deviation. Draw a relative frequency histogram to depict the results
elliptical trainers are becoming one of the more popular exercise machines. their smoothand steady low-impact motion
A CEO of a large pharmaceutical company would like to determine if he should be placing more money allotted in the budget next year for television advertising of a new drug marketed for controlling asthma.
question the mean life of a battery used in a digital clock is 305 days. the lives of the batteries follow the normal
the following data show the number of fruit fly killed at varying concentrations of nicotine.the number of ies killed
Calculate expected value for each decision and choose the best one. Find out how much firm would be eager to pay to a market research firm to gain better information about future market conditions.
Can you conclude that the variances of the breaking strengths of natural and synthetic fibers are different? Use a level of significance α of 0.05. What assumptions are necessary to perform this test?
a random sample of 20 people found that the number of mail-order catalogs that each had received in the last month were
a study of the net sales of a sample of small corporations revealed that the mean net sales is 2.1 million the median
What is the value of t*, the critical value of the t distribution for a sample of size 22, such that the probability of being greater than t* is 1%?
Let p1 = 100 and n1 = 500; and p2 = 200 with n2 = 500. Test whether there is a statistical difference between the two proportions at the 5% significance level.
Suppose we ?ip a coin n times and let p denote the probability of heads. Let X be the number of heads. We call X a binomial random variable, which is discussed in the next chapter.
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