Percentage points of the actual proportion
Suppose that 40 percent of the voters in a particular region support a candidate. Find the probability that a sample of 900 voters would yield a sample proportion in favor of the candidate within 3 percentage points of the actual proportion.
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Find the probability that the mean SAT score for a randomly selected group of 150 11th graders is between 508 and 492.
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Find the 90% confidence interval for the true difference in proportions for the data in problem above.
Find the probability that a sample of 900 voters would yield a sample proportion in favor of the candidate within 3 percentage points of the actual proportion.
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The following table shows the distribution of blood types in the general population. What is the probability a person will have type O blood?
A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 9. At ? = 0.05 is there enough evidence to reject the researcher's claim? Show all work.
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