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Develop an alternate conclusion for the 4 studies presented below that would appear more plausible to an astute student of statistical data analysis and interpretation.
a. Based upon a study of the heights of men playing basketball, a researcher concludes that the exercise from playing basketball causes people to grow taller.
b. Based upon a study showing college graduates tend to live longer than those who do not graduate from college, a researcher concludes that studying causes people to live longer.
c. A study shows that in Peach County, GA more speeding tickets were issued to minorities. Conclusion: Minorities speed more than non-minorities in Peach County, GA.
d. In a study of cold symptoms, all of the subjects with a cold were found to be improved two weeks after taking ginger pills. Conclusion: Ginger pills cure colds.
Find the 95 percent confidence interval for the mean score on each exam. Do the confidence intervals overlap? If so, what does this suggest?
Suppose that once a prize is rejected it is lost, and that our objective is to maximize the probability of obtaining the best prize. Assuming that all n! orderings of the prizes are equally likely, how well can we do?
The weight of a 5th grader is normally distributed with a mean of 75 pounds and a variance of 113 pounds^2.
A box has red marbles and blue marbles. The fraction p of reds is unknown. 250 marbles are drawn at random with replacement, and 102 turn out to be red. Estimate p. Attach a standard error to your estimate.
(I) What does the slope of this line say about the relationship between price and number of carats? (II) What is the predicted price when number of carats =0? How would you interpret this price?
An electrical firm manufactures electric light bulbs that have a length of life which is normally distributed with mean and standard deviation equal to 500 and 50 hours, respectively.
The philosophies that created the US Constitution were a political experiment, one that had never been tried before. Write an analysis of the influence and changes for each of the following democratic republican ideals ideals.
A sample of ten ER patients was conducted to determine their average wait time and to compare this to the target wait time. The hospital wants to make sure that patients do not wait more than 35 minutes. Test following hypotheses using a 95% con..
Tweleve cases of leukemia are reported in people living in a particular census tract over a 5 year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer incidence rates?
In Problem 8.4.5, we used simulation to estimate the probability of symbol error. For transmitting a binary bit stream over an M-PSK system, we set each M = 2N and each transmitted symbol corresponds to N bits.
Calculate the sales-volume variance and flexible-budget variance for operating income - compute price and efficiency variances for direct materials and direct manufacturing labor.
Crawling. A study published in 1993 found that babies born at different times of the year may develop the ability to crawl at different ages!
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