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A chi-square test for goodness of fit is used to test whether or not there are any preferences among 3 brands of cola. If the study uses a sample of n = 60 subjects, then the expected frequency for each category would be
A. 1
B. 15
C. 20
D. 30
Fitting of multiple linear regression equation - Give a list of the model assumptions for a regression model.
The athletic director claims that the atendance is the same as last year. What is the test value needed to evaluate the claim?
A wildlife biologist captures a certain species of geese in orer to weigh them. Using science, he determines that the weights are normally distributed with a mean of nine pounds and a standard deviation of 1.3 pounds.
The number of traffic accidents that occurs on particular stretch roas during a month follows a Poisson distribution with mean of 8.5. Find the probability of observing exactly three accidents of this stretch of road next month.
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
Roberta scored in the 85th percentile on a standardized test of reading ability. What is Roberta's associated z score?
Suppose that a study based on a sample from a targeted population shows that people at a pizza restaurant are hungrier than people at a coffee shop. Make an interference based on the results of the study.
A study reported in "Inside Higher Education News" (May, 2006) found that financial incentives can improve low-income college students' grades and retention.
Confirm that these statements are accurate by finding the geometric mean rate of increase.
Assume we know the length of time a battery will hold a charge is a normal distribution with a mean of 50 hours and a standard deviation of 15 hours.
Researchers are studying the absorption of two drugs into the bloodstream. Each drug is to be injected at three dosages. There are 24 people in the study, and they are randomly divided into six groups.
Describe the purpose of transforming raw scores into standard scores. Describe what "normal distribution" means.
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