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A loan officer at a bank rates applicants for credit. Ratings are normally distributed. The mean is 240 and the standard deviation is 60. If 49 applicants are randomly chosen, what is the probability that they will have a rating between 230 and 260? Round z scores to two decimal places.
Gallons and standard deviation 12 gallons. On a randomly selected day, the probability that the store sells at least 154 gallons is?
A new president at Big State University has made student satisfaction with the enrollment and registrations process one of her highest priorities.
Then comment on the effectiveness of the presentation: Were the frequency distributions used effectively to report the results? Why or why not?
The two cars drove a combined total of 1450 miles, and the sum of their fuel efficiencies was 40 miles per gallon. What were the fuel efficiencies of each of the cars that week?
One of the main measures of the quality of service provided by any organization is the speed with that responds to customer complaints. A large family-held department store selling furniture and flooring, including carpet, had undergone a chief ex..
The speed limit on Interstate 75 around Findlay, Ohio, is 65 mph. On a clear day with no construction, the mean speed of automobiles was measured at 63 mph with a standard deviation of 8 mph.
Steps in hypothesis test procedure - conducting a hypothesis test for some general statistic, ? say.
A sample of n observations is taken from a population. When performing statistical inference about a population variance, the appropriate chi-square distribution has:
An accounting firm has recently recruited six graduates: three men and three women. Three of the graduates are to be selected at random to work in the firms suburban office. Construct a probability tree.
Thirty-five fourth-grade students were asked the traditional question "what do you want to be when you grow up? The responses are summarized in the following table:
A 'good' correlation is data-context driven. For example, I did a project correlating sales volume per state and customer demographics (pretty 'hard' data) and got a .92 correlation.
Calculate a 95 percent confidence interval for the mean percentage share of billing volume from network television for the population of all US advertising agencies.
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