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Suppose that, as reported by the Centers for Disease Control, about 30% of high school students smoke tobacco. You randomly select 120 high school students to survey them on their attitudes toward scenes of smoking in the movies.
a) What's the expected number of smokers?
b) What's the standard deviation of the number of smokers?
c) The number of smokers among 120 randomly selected students will vary from group to group. Explain why that number can be described with a Normal model.
d) Using the 68 - 95 - 99.7 Rule, create and interpret a model for the number of smokers among your group of 120 students.
Does the phase of the moon have any bearing on birthrate? Each of 222,784 births that occurred during a period encompassing 24 full lunar cycles was classified according to lunar phase.
lie detectors are controversial instruments barred from use as evidence in many courts. nonetheless many employers use
In each of the following cases. find the mean , variance and standard of the sampling distribution of sample proportion p.
If the data were collected for a sample of 50 households rather than 100, develop an 85% confidence interval estimate of the population mean annual amount spent, assuming the population has a normal probability distribution.
The null hypothesis is to be tested at 95% confidence. Determine the critical values for this test.
Supposing that there is no cost of entering the sweepstakes, find the expected value of the amount won for one entry. Determine the expected value if the cost of entering this sweepstakes is the cost of a postage stamp. Is it worth entering the cont..
The IQs of 17 students from one area of a city showed a mean of 106 with a standard deviation of 10, whereas the IQs of 14 students from another area showed a mean of 109 with a standard deviation of 7.
Find P22, the 22-percentile. This is the temperature reading separating the bottom 22% from the top 78%.
As part of a review of its rate structure, an automobile insurance company has compiled lhe following data on cl.aims filed by five roale policyholders and five female policyholders.
Mr. Smith had 11 stocks that averaged 11.3 percent with a standard deviation of 3.2 percent. At the .02 level of significance, can we conclude that Mr. Jones' stocks have a different variation?
Conduct the hypothesis test and provide the test statistic, critical value, and P-value, and state the conclusion.
The first value you enter is the sample mean for the data on female exercise times per week in minutes. Be certain to round your answer to exactly 4 decimal places.
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