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The average time a subscriber spends reading the Wall Street Journal is 49 minutes. Assume that the standard deviation is 16 minutes and the time are normally distributed .
i) What is the probability a subscriber will spend at least 1 hour reading the journal ?
ii) What is the probability a subscriber will spend no more than 30 minutes reading the journal ?
Convert each of the following z intervals to raw score x intervals:
Consider a random sample of size n from an exponential distribution, Xi ~ EXP(1,eta). a) Show that Q = X1:n - eta is a pivotal quantity and find its distribution.
IS there any evidence that a freshman's chances to graduate may depend upon what kind of high school the student attended? Describe.
Constructing histogram, Using a normal probability plot, Plotting residuals versus x values.
Suppose that 46 percent of families living in a certain country own a car and 18 percent own an SUV. The Addition Rule might suggest, then, that 64 percent of families own either a car or an SUV. What's wrong with that reasoning.
They were planted in four different locations, so we will consider the field as a second factor because different soil and moisture types can also have an effect on yield. The interaction plot below was obtained.
Are the events "Republican" and "30-44" independent? Justify your answer. Are the events "Democrat" and "65+" independent? Justify your answer.
A population of scores has p = 44. In this population, an X value of 40 corresponds to z = - 0.50. What is the population standard deviation.
What is the 99% confidence interval?
Using smoothing constant of w = .80, compute the value of exponentially smoothed series in 1983.
The following data represent scores of 50 students in the applied business statistics test. Prepare the frequency distribution table and the frequency histogram for this data set.
How many subjects must be tested to determine the effectiveness of the product?
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