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A newspaper article reported that the typical American family spent an average of $81 for Halloween candy and costumes last year. A sample of n=16 families this year produced a mean of $90 with SS=9375. Do these data indicate a significant change in holiday spending? Use a two-tailed test with alpha = .05. What are the detailed steps for hypothesis testing?
The student newspaper on our campus was interested in binge drinking. For their article, they surveyed 50 fraternity members, and found they drink more than 5 drinks an average of 7 times per month.
A breakdown of the responses is shown in the accompanying table. Is there evidence at the 10% level to infer that the responses differ among the three groups of employees?
The branch manager of a pet supply store wants to study characteristics of customers of his store. In particular, he decides to focus on two variables
Evaluate the performance of this decision.
Determine the chance between 39% and 41% of registered voters in sample are Democrats.
a health care facility is interested in monitoring the primary c-section rate. monthly data on the number of c sections
If x is a binomial random variable where n=100 and p=.1, find the probability that x is less than or equal to 11 using the normal approximation to the binomial.
the following data give the 1994 total area of farmland in millions of acres for 10 states statistical abstract of the
Find the 95% confidence interval of the mean score for all golfers if this is a sample of 80 golfers instead of a sample of 50.
Pulte homes is developing two parcels near Medical Center in Houston, TX. In order to test different advertising approaches, they use different media to reach potential buyers.
Suppose you want to test the claim that a mean is greater than 25.6, where the population standard deviation is known. Given a sample size of n = 44 and a level of significance of when should you reject?
Write down the name of 4 parts of the regression equation.
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