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Some studies have shown that in the United States, men spend more than women buying gifts and cards on Valentine's Day. Suppose a researcher wants to test this hypothesis by randomly sampling 9 men and 10 women with comparable demographic characteristics from various large cities across the United States to be in a study.
Each study participant is asked to keep a log beginning 1 month before Valentine's Day and record all purchases made for Valentine's Day during that 1-month period. The resulting data are shown below. Use these data and a 1% level of significance to test to determine if, on average, men actually do spend significantly more than women on Valentine's Day. Assume that such spending is normally distributed in the population and that the population variances are equal.
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Find the critical value for a right-tailed F-test when alpha=.05 the degrees of freedom for the numerator (d.f.N.) are 15, and the degrees of freedom for the denominator (d.f.N.) are 21.
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if we reject the null hypothesis what can we conclude subject to the ? risk?null hypothesis is falsealternative
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which of the following methods could lead to stronger evidence for the outcome of a nonparametric test?a. ensure that
What is the probability that the mean breaking strength of the 3 untreated specimens is at least 25 pounds greater than the mean strength of the 3 treated specimens?
Among 620 adults selected randomly from among the residents of one town, 18.9% said that they favor stronger gun-control laws.
Find a 95% confidence interval for the mean price of all summer sleeping bags.
the image of the public library is constantly changing and their online services continue to grow. usage of the
The quality control engineer for a furniture manufacturer is interested in the mean amount of force necessary to produce cracks in stressed oak furniture.
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