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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
Determine the z score and the area.
Suppose Ana has a pair of dice (the traditional six-sided kind). Let X= the difference of the largest minus the smallest number showing on the dice. Find the PMF for X.
What are some ways in which we as researchers can present our data and our findings in a way that can be understood my managers, employees and other stakeholders?
Sixty percent of Americans read their employment construct, including the fine print ("Snapshots," usatoday.com, January 20, 2004). Assume that the number of employed who read every word of their contract can be modelled using the binomial distributi..
Question 1What is the probability of winning a low, even, red, black, odd, or high bet in the game of American roulette? What is the probability of winning a bet placed on any one particular number, e.g., 33? Notice that under American roulette, ther..
A sample of 100 yields x ¯ = 24. The population standard deviation is 12. If a = .05, find the acceptance/rejection region H_0 and determine if you accept or reject the hypothesis H_0 (Draw graph!).
What is the dependent variable and what is the categorical variable - What does this mean in terms of the alternative hypothesis?
Last year, at Northern Manufacturing Company, 200 people had colds during the year. One hundred fifty-five people who did no exercising had colds, and the remainder of the people with colds were involved in a weekly exercise program. Half of th..
According to the Center on Budget and Policy Priorities article "Curbing Flexible Spending Accounts Could Help Pay for Health Care Reform" (revised June 10, 2009), flexible spending accounts encourage the over-consumption of health care; people buy t..
80% of those who take a certification exam pass it. Assume binomial distribution applies. 15 people have registered to take the exam in June. What is the probability that exactly 12 of them will pass the test?
The marketing team from Mi Casa Front Porch Restaurant is looking to promote the restaurant on the internet. They want to provide a realistic view of ranges for average bill for a party of 2 for lunch and dinner. They have gathered the following data..
Brief literature review of factors influencing sales - investigate the relationship between advertising expenditure and sales.
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