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A health researcher conducted an experiment in which participants watched a film that either did or did not include a person being injured because of not wearing a seat belt. A week later, as part of a seemingly different study, these same participants reported how important they thought it was to wear seat belts. The 16 participants who had seen the injury film gave a mean rating of 8.9 with an estimated population standard deviation of 2.1. The 36 participants in the control condition had a mean of 7.0 with an estimated population standard deviation of 2.4. Do these results suggest that seeing a movie with a person being injured due to not wearing a seat belt makes attitudes more positive (higher ratings) towards seat belt usage? (Use the .01 level.)
Write the hypotheses (null and alternate).
Explain what you did to a person who is familiar with the t test for a single sample, but is unfamiliar with the t test for independent means. Be sure you explain how this problem differs from a t test for a single sample. Your answer should consist mainly of a thorough explanation of the characteristics of the comparison distribution and the logic of all steps of figuring you did to determine those characteristics
in 350 words or more, explain how you might view statistics differently and how you will use statistics in your everyday life. Will you apply what you have learned in this course? How?
A randon sample of monthly gasoline bills for a company's 15 sales persons are:$216-254-247-257-231-265-221-226-228-252-235-265-272-285-266. what is the mean? what is the median? what is the value of quartile 3? what is the value of the mode? the ran..
It is estimated that such a programme will cost $7 M and that the probability of the flu striking in the next year is 0.75
What are the variance and standard deviation?
Regression and Correlation Methods: Correlation, ANOVA, and Least Squares - Calculate a one-way ANOVA to test the null hypothesis that the mean of each group is the same.
What is the variance of the data?"
An attendant at a car was is paid according to the number of cars that pass through.
A sample of 9 production managers with over 15 years of experience has an average salary of $71,000 and a sample standard deviation of $18,000.
Visit the websitepollingreport.comor any other public opinion polling site and find a poll that interests you personally or professionally. Give the topic of the poll, the sample size, and margin of error. Do you think the result of the poll from the..
The population proportion of Americans with diabetes is 9 percent (uc0u960 = 0.09). In repeated random samples of n = 800 Americans, 90% of sample proportions of people with diabetes would fall within______ from
9.2 The dean of a graduate school wishes to predict the grade point average in graduate work for recent applicants. List a dozen variables that might be useful explanatory variables here.
Calculate the standard deviation for the sample mean
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