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Male female math 10 20 English 20 10 History 15 15 What hypothesis might you be interested in here? The Physicians Health Study (1989) was a randomized, controlled, double-blinded experiment. Half of 22071 men over 40 took an aspirin every other day, while half took a placebo. Heart attack no heart attack aspirin 104 10933 placebo 189 10845 The question is whether memebership in the aspirin group affects (lowers) the heart attack rate. Why is the question here different from the previous question? What would we expect to see if the two categories are independent? Of course, random chance will cause some variation. What would we expect to see if the two categories are perfectly dependent? For example, if you toss a coin to determine who gets a heart attack and who does not, then aspirin use is clearly unrelated to heart attack. But we know that one is unlikely to get exactly equal numbers of heads for both groups. By chance, one or the other will have a slight excess of heart.
Define the population. State the hypotheses for the study. Decide which statistical test is appropriate and compute the test statistic (z or t). Why is the test appropriate?
Using α = 0.05, does this sample provide enough evidence to conclude that the average utility bill in Delaware was lower in the winter of 2011-2012 than it was in the winter of 2010-2011?
The general social survey is an annual survey given to about 1,500 U.S. adults selected at random. Each year, the survey contains several questions meant to probe the respondents' views of employment.
Problem: Two rainstorms occurred in one week in a certain area. In the first storm 30 ml of rain fell per hour, and in the second storm 20 ml of rain fell per hour.
Using decision tree analysis, decide whether Jay must proceed with his law suit against manufacturer.
Lauren Moore has sold her business for $500,000 and wants to invest in condominium units ( which she intends to rent) and land ( which she will lease to a farmer).
Based on these results, is there significant difference between attitudes for males and for females? Use two tailed test with alpha = .05.
Construct a 99% confidence interval for the standard deviation, σ, of the replacement times of all washing machines of this type.
Iit is known that signal change in this brain area is normally distributed with mean of 35 and standard deviation of 10. By using .01 level, what must researcher conclude?
Neckwarmers. Mountainside Fleece sold 40 Neckwarmers. Solid-color neckwarmers sold for $9.90 each and print ones sold for $12.75 each.
A federal bank examiner is interest in estimating the mean outstanding defaulted loans balance of all defaulted loans over the last three years. Calculate a 90% confidence interval for the mean balance of defaulted loans over the past three years.
Which shows the production time requirements for the 4 required manufacturing operations and the accounting department's estimate of the profit contribution per bag?
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