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According to a study conducted by Dell Computers, 65% of men and 70% of women say that weight is a very important factor in purchasing a laptop computer. Suppose this survey was conducted using 374 men and 481 women. Do these data show enough evidence to support the conclusion that there is no difference in the proportion of men and women who think weight is a factor in purchasing a laptop? Use a 5% level of significance.
1 the number of traffic accidents that occur on a particular stretch of road during a month follows a poisson
What is the probability that all three answers are correct? Two cards are drawn at random without replacing from a deck of 52 cards. What is the probability that both cards are aces?
during a national debate on changes to health care a cable news service performs an opinion poll of 470 small-business
consider again the landowners decision problem. suppose now that at a cost of 90000 the landowner can request that a
If you want to determine whether the number of hours spent in a class was related to exam grades for stats students, which statistical test would you use?
Is it reasonable to conclude that the mean weekly salary of school teachers is lower at a .05 level of significance? Why?
Effects of Tariffs Assume a simple world in which the United States exports soft drinks and beer to France and imports wine from France.
Assuming that the odds ratios for the two groups, those with zero or one partner and those with two or more partners, are equal (in other words, the number of partners is not an effect modifier), calculate the Mantel-Haenszel estimate of this comm..
a manufacturer of window frames knows from experince that 1 percent of the production will have some type of minor
You are dealt 2 cards from a shuffled deck of 52 cards, without replacement. There are four suits of 13 cards each in a deck of cards
Patients with a cardio logical illness and less than normal heart muscle strength can benefit from an assistance device. An electric ventricular assist device (EVAD) converts electric power into blood flow by moving a pusher plate against a flexib..
Researcher has 100 test subjects to split into his treatment and control groups. In order to prove any causal relationship between treatment and outcome, he should:
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