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Normal distributions are extremely important in stats.
In a standard normal dist. what is the prob. of getting a value less than 1.63?How about between 1.13 and 1.86?How about greater than .58?
In a normal dist. with mean = 40 and std.dev. = 13, what is the prob. of getting a value less than 45?How about between 33 and 52?How about greater than 21?
Compute the pdf of continuous random variable Z where Z = X + Y and X is a continuous random variable uniformly distributed on [0, 2] and Y is a continuous random variable uniformly distributed on [0, 4]. Assume that X and Y are independent.
Critically discuss the probability that more than 175 cable households rate cable companies as good or excellent in quality transmissions?
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
What would you recommend Taylor do to cut back its labor cost? (Illustrate using an ABC plan.)
The main part of the ACS contacts 250,000 addresses by mail each month, with follow-up by phone and in person if there is no response. Each household answers questions about their housing, economic, and social status. What is the Population.
At the 0.05 level of significance, is there evidence of a difference in the mean waiting times in the four locations? State your null and alternative hypotheses. (Note: while the small sample size could justify use of the non- parametric Kruskal-W..
Jointsoft is a great over-the-counter arthritis medication, but who will ever know about it? Unfortunately, many people with arthritis tend to be elderly and rather immobile, so advertisers of arthritis medications face limitations in ways to get ..
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
Determine her weighted mean grade? What letter grade did she earn? (A, B, C, D or F).
For the following data set, indicate whether the shape of the distribution is normal, positively skewed, or negatively skewed. Provide evidence for your answer by calculating the mean, mode, and median.
What is your conclusion? Are the two variables independent?
Which of the following is NOT true regarding the normal probability distribution.
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