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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.
Probability distribution described by the following density curve and The expected value of the sum of the weights of the two oranges, in pounds
When the p-value is used for hypothesis testing, the null hypothesis is rejected if
If level of significance ( α ) is 0.005 in two-tail test, how large is non rejection region under curve of the t distribution?
Find the probability that a women develops breast cancer given that she has a family history of breast cancer._____________
Construct a scatter plot of P-RFM and P-HELM. If drawing the plot by hand, use graph paper to ensure accuracy.
The sample size n, the sample means, and the sample standard deviations for the two groups are given
A business owner decides to use a binomial distribution to solve one of his problems.
We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
Determine the probability that a randomly selected teacher earns more than $525 per week?
What is the probability of this actually happening?
Suppose you had flipped a fair coin 19 times and "tails" had come up each time. The probability of now tossing a "head" on the 20th flip would then be:
How likely is it that the store owner will make at least $7,000 if she implements your suggestion?
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