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A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages plus Yellow Pages. On each page, the mean area devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (in square millimeters) are shown below:
0
260
356
403
536
268
369
428
469
162
338
130
(a) Construct a 95 percent confidence interval for the true mean.
(b) Why might normality be an issue here?
(c) What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
(d) If this is not a reasonable requirement, suggest one that is.
We are interested in testing to see if the variance of a population is less than 7. The correct null hypothesis is:
Which statement is true for a statistical study?
The Minneapolis Tribune ran an article on gender differences in shopping behavior. When 400 women were asked to respond to the question "Where I shop is influenced by which store has a greater variety," 60% answered "Yes.
The mean maximum oxygen uptake for elite athletes has been found to be 80 with a standard deviation of 8.1. Assume that the distribution is approximately normal.
Then explain your answer to someone who has never had course in statistics (but who is familiar with mean, standard deviation, and Z scores.)
The standard deviation of the differences d for the paired sample data s d = ____________
By using this data and incorporating seasonal effects, predict quarterly turnover for 2010.
Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.
If the standard deviation is $89.46, find the probability that a randomly selected customer spends between $550.67 and $836.94.
What is the probability of selecting an accounting major, given that the person selected is a male?
High levels of glucose in the blood are indications of diabetes, which is becoming more prevalent in the United States. Diabetes can lead to many complications such as blindness and heart disease. A random sample of 180 individuals had their blood su..
Table shows the smoking habits of group college students. If student is selected at random, determine the probability of getting someone who is man or a woman.
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