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Problem 1: It has been reported that the average U.S. teenager sends 80 text messages per day. For purposes of this exercise, we will assume the daily number of text messages sent is normally distributed with a standard deviationof 15.0 messages. For a randomly selected group of 10 teenagers, and considering these persons to be a simple random sample of all U.S. teens, what is the probability that the group will send at least 900 text messages (i.e., a sample mean of at least 90 messages per teen) next Wednesday? Source: healthnews.com, May 27, 2009.
Inference about the slope b of a least-squares regression line is based on which of the following distributions?
Problem based on combinatory - how many different license plates are possible?
Is there significant evidence at the 1% level that the mean amount charged increases under the no-fee offer? State H0 and Ha and carry out a test.
Assume the random variable x is normally distributed with mean u = 88 and standard deviation o = 4. Find the indicated probability. P(x
question to help determine how many beers to stock the concession manager at yankee stadium wanted to know how the
Using the data of Exercise 1 and assuming simple random sampling, (a) give the ratio-to-size estimate of the population total and (b) estimate the variance of that estimator.
At the 0.05 level, can we conclude that the average production employee will complete the test more quickly the second time he or she takes it?
Suppose we wanted to test the hypothesis that the employment status of these disadvantaged women.
A jar contains twenty marbles, eight red, eight blue and four green. The probability of drawing a blue marble is twice that of drawing a green.
Suppose that a marketing research firm sends questionnaires to two different companies. Based on historical evidence, the marketing research firm believes.
What Is the difference between independent and dependent variables and how it can be evaluate for EBP
the mean age at which men in the united states marry for the first time follows the normal distribution with a mean of
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