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In his management information systems textbook, Professor David Kroenke raisies an interesting point: "If 98% of our market has Internet access, do we have a responsibility to provide non-Internet materials to the other 2%?" (D.M. Kroenke, Using MIS, Upper Saddle River, NJ: Prentice Hall, 2007, p. 29a). Suppose that 98% of the customers in your market have Internet access, and you select a random sample of 500 customers. What is the probability that the sample has:
a. Greater than 99% of the customers with Internet access?
b. Between 97% and 99% of customers with Internet access?
c. Fewer than 97% of the customers with Internet access.
Assuming that the standard deviation and the normal shape are unchanged, to what level must the mean reduce so that 20 gallons per week is the third quartile rather than the mean?
Suppose the regression equation that has been used to estimate the value of existing homes is as follows; Interpret the meaning of the slopes of this equation.
Using the ten sample-mean values, estimate the mean of the population and the variance of x .
Drug manufacturer knows that for a certain antibiotics, the average number of doses ordered for a patient is 20. Steve Simmons, a salesman for the company
The chi-square goodness of fit test can be used when we:
A neuropsychologist compare the auditory abilities of blind versus normally sighted rats. He predicted that the visually impaired rats would have better auditory development than normally sighted rats.
List all samples of 3 and compute the mean of each sample. Compute the mean of the distribution of sample means and population mean. compare the two values
Using the 0.10 level of significance, is there evidence that the population mean is above $300?
The study does provide sufficient evidence to support the claim that less than 75% of college student spend less than $250 per semester on textbooks.
An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
We assume that we have selected two independent random samples from populations having proportions p 1 and p 2 and that p-hat 1 = 800/1000 and p-hat 2 = 950/1000
prevent coronary artery vasoconstriction and the attendant reduction in blood flow to the heart and mechanical function.
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