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What are post hoc comparisons, and why do researchers make them? Why do researchers not use the Bonferroni procedure of procedures for post hoc comparisons? What is the advantage over the Bonferroni procedure of procedures such as the Tukey and Scheffe tests? Is Scheffe preferred over others if so, why and what are the advantages and disadvantages? How do you carry out the Scheffe procedure?
Construct a 95 percent confidence interval for the true mean.
Election officials take a random sample of 100 signatures and thoroughly investigate them to find that 84% are valid. Is this statistically significant evidence that the candidate has enough valid signatures overall? Explain.
In a bumper test, three types of autos were deliberately crashed into a barrier at 5mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Are mean crash damages the sa..
A recent study stated that if a person chewed gum, the average number of sticks of gum he or she chewed daily was 8. To test the claim, a researcher selected a random sample of 36 gum chewers and found the mean number of sticks of gum chewed per d..
Recent medical research demonstrated there is a strong (r=.60) correlation between the excessive weight and incidences of breast cancer. How can we interpret this statement?
There is enough evidence at a significance level of 10%, to conclude that the content average sodium this brand of corn flakes is 130 milligrams?
At a large university, 500 freshmen take their final exam for their marketing course. Scores are normally distributed with a mean 79 and standard deviation 7.
Find out the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? What percent of the garages take between 29 hours and 34 hours to erect?
The speed limit on Interstate 75 around Findlay, Ohio, is 65 mph. On a clear day with no construction, the mean speed of automobiles was measured at 63 mph with a standard deviation of 8 mph.
What critical value should the company officials use to determine the rejection region?
An F statistic is any statistic that follows an F distribution. Which of the following are true about F statistics and f distribution? Select all that apply
Using the probabilities above what is the expected size of family you draw?
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