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An investigator wants to estimate caffeine consumption in high school students. How many students would be required to ensure that 95% confidence interval estimate for the mean caffeine intake (measured in mg) is within 15 units of the true mean? Assume that the standard deviation in caffeine intake is 68mg.
How many students would be required to estimate the proportion of students who consume coffee? Suppose we want the estimate to be within 5% of the true proportion with 95% confidence.
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
Solution throughout graphical method. Produced by a company linear programming model is used to describe the production schedule.
Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..
If we repeated this procedure many, many times, only 5 percent of the 95 percent confidence intervals would fail to include the mean Math SAT score of the population of all students at this college.
Does this result support original claim, or is population percentage considerably less than 45%. Use alpha=.05 for level of significance.
A graphical presentation may accomplish ALL BUT which of the following objectives? Illustrate the amount of variation in the data.
Determine the control limits for the mean and the range. Plot the control limits for the mean outside diameter and the range.
In a binomial distribution n = 8 and π = 0.2. Determine the probabilities of the following events.
Two semiconductor factories are being compared to see if there is a difference in the average defect rates of the chips they produce. In the first factory, 250 chips are sampled. In the second factory, 350 chips are sampled. The proportions of def..
What is the mean and standard deviation of the sampling distribution of x-bar assuming that mean =20 and standard deviation equals the square root of 20?
Compute the value of t. What is your decision regarding the null hypothesis? Briefly summarize your results.
There're several advantages of using a paired t-test. Since the same subjects are being tested in each of the varying conditions, those subjects serve as their own control.
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