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Five children under twelve are selected at random. The probability that the average number of hours that they spend each week watching television is at least 30 is about:
(a) 32%
(b) 48%
(c) 98%
(d) 20%
(e) 2%
Tom Sevits is the owner of the Appliance Patch. Recently Tom observed a difference in the dollar value of sales between the men and women he employs as sales associates.
A mean score of 600 and a standard deviation of 100. What credit score defines the top five percent of scores. Within what range would 85% of credit score fall.
What is the probability that between 5 and 10 firms, inclusively, purchase a Unix machine from Sun Microsystems?
Test whether the music reduces studying capacity at a .05 level of significance.
Determine the probability that the given class period runs greater than 50.75 minutes. Determine the probability of choosing the class period runs greater than 50.75 minutes.
The mean number of passengers per cruise is 1,820 and the standard deviation is 120.
The owner of Western Clothing Company has determined that the company must sell 670 pairs of denim jeans each month to break even (i.e., to reach the point where total revenue equals total cost).
Douglas Boats is considering the possibility of expanding the warehouse for the WM-4 motors. How much should Douglas Boats expand, and how much would it be worth for the company to make the expansion? Assume demand is constant throughout the year.
Suppose a statistician chose to test a hypothesis at sigma = 0.01. The critical value for a right-tailed test is +2.33. If the test value were 1.97, what would the decision be?
Discuss the properties of a normal distribution. Why are there infinite possible normal distributions? Why should one assume that sample data represents a population distribution?
Of the 500 students who responded to a survey about recycling on campus, 350 said they recycle on a regular basis. The sample proportion is ??
For two samples from what are assumed to be normally distributed populations, the sample size and standard deviations are n1 = 10, s1 = 23.5, n2 =9 and s2=10.4.
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