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In a study, 37% of adults questioned reported that their health was excellent. A researcher wishes to study the health of people living close to a nuclear power plant. Among 12 adults randomly selected from this area, only 3 reported that their health was excellent. Find the probability that when 12 adults are randomly selected, 3 or fewer will report they are in excellent health.
The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally di..
Find a 95% confidence interval for the percentage of girls and women in Taiwan who had antibodies at that time.
Suppose we compare two population means, μ 1 - μ 2 . In each case, indicate how μ 1 relates to μ 2 :
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
The times required to assemble a product are normally distributed with a mean of 47.5 minutes and a standard deviation equal to 8.5 minutes. What percent of the assembly workers require: (do not include % symbol)
95% confidence interval evaluate for proportion of Americans who believe Abraham Lincoln is United States' most outstanding President is 65% to 75%. If more precise estimate is requested, then confidence level.
a) What statistical test should be used to analyze these data? b) Identify H0 and Ha for this study. c) Conduct the appropriate analysis d) Should H0 be rejected? What should the researcher conclude?
Set up hypothesis and two-tailed decision rule for right mean using 5% level of significance. Hypothesis for a two-tailed decision is?
Determine the overall probability (rating), given all the ratings and weightings that, when A, B, C, D and E are combined.
Caselet on McDonald’s vs. Burger King - Waiting time
A DVD rental store wants to know what proportions of its customers are under age 21. A simple random sample of 500 customers was taken, and 375 of them were under age 21. Presume that the true population proportion of customers under age 21 is 0.6..
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