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Survey: Cellular Phones According to an article appearing in The Wall Street Journal, about 35% of all U.S. households have a cellular phone. Suppose that you are conducting a survey of customer satisfaction regarding their cellular phone. If you called 11 households selected at random, what is the probability that:
a) Every household has a cellular phone?
b) More than four households have a cellular phone?
Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades? Explain.
Sample data are reported for 50 employees of small companies, 75 employees of medium companies, and 100 employees of large companies.
Formulating null and alternative hypothesis to test the claim averaging about $5000.
At α = 0.01, is the degree of certainty independent of credits earned?
Last school year, student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classificati..
For all questions, clearly explain/show your answers. For the Analysis section, justify your answers with the appropriate graphs, statistics, equations, etc.
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the insulation is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. A sam..
Is there evidence to suggest that the training course helps out sales people?
A probability value of .25 means that an event will occur:
In a regression model involving 30 observations, the following estimated regression equation was obtained:
What happens to the boundaries for the critical regions?
What is the probability that a respondent said neither the Big Ten nor the Pac-10 would have a team in the Rose Bowl?
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