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Prior to being hired, the five salespersons for a computer store were given a standard sales aptitude test. For each individual, the score achieved on the aptitude test and the number of computer systems sold during the first 3 months of their employment are shown here.
Determine the least-squares regression line and interpret its slope. Estimate, for a new employee who scores 60 on the sales aptitude test, the number of units the new employee will sell in her first 3 months with the company.
Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation
It can be shown thatμx= 7/12 andσ2x= 11/144. What is the probability that the value ofxis more than 1 standard deviation from the mean value? (Round the answer to four decimal places.) P(xis more than one standard deviation from the mean value) =
The repeated-measures analysis of variance can be viewed as a two-stage process. What is the purpose for the second stage? Compare the repeated-measures analysis of variance with the regular ANOVA.
A prestigious university requires a score of at least 750 on a graduate exam for admission to its MBA program. Suppose the graduate exam is normally distributed with a mean of 500 and a standard deviation of 200.
(a) What is the probability that the student is both a freshman and a mathematics major? (b) Given that the student selected is a freshman, what is the probability that he is also a mathematics major
What key factors of a business situation indicate the need for simulation
A student applying the first differences transformations in (12.29a, b) found that several values equaled zero but that the corresponding Y: values were nonzero. Does this signify that the first differences transformations are not appropriate for..
a sports card company produces many cards a year both high and low end. an amateur statistician has decided to estimate
suppose five 6 oz tubes of toothpaste are randomly selected and squeezed until no more toothpaste will come out. then
one of the requirements of linear regression is homoscedasticity of the residuals. this means that .a. the sizes of the
Determine the frequency of wrong numbers given to callers. Each sample consisted of 100 calls. Determine 95 pct limits. Is the process stable(i.e., in control)? explain.
a at a local car dealership the probability of a salesman making a car sale to a customer is 0.4. the probability
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