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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
Whats the temperature
The program office budgets $30,000 per program review at the contractor's site. Your concern for "end of year" spending drills is that you have budgeted enough for the reviews (i.e. you are only concerned if the actual costs are higher than the $30,0..
In a normal distribution of measurements having a mean of 500 feet and a standard deviation of 50 feet, what percent of the distribution falls between 490 and 520 feet?
Binge drinking and alcohol-related behaviours amongst Pacific youth: a national survey of secondary school students
Each member of a random sample of 15 business economists was asked to predict the rate of inflation for the coming year. Assume that predictions for the whole population of business economists follow a normal distribution with standard deviation 1.8%..
Consider a machine that fills soda bottles.
refer to the following frequency distribution for questions 1 2 3 and 4.the frequency distribution below shows the
What differentiates the two formulas Σ (x - xbar)^2/n-1 from Σ (x - µ)^2/n, and why the difference?
Which of these strategies is better for the professors
A bank branch located in a residential area has developed an improved process for serving customers during noon to 1:00 P.M lunch period. The waiting time in minutes (defined as time the customer enters the line to time he or she reaches the teller w..
1. Compute C10,5, P8, 4, C8, 4. P9,6 2. A sales representative must visit seven cities. There are direct air connections between each of the cities. Use the multiplication rule of counting to determine the number of different choices the sales repres..
Recent information published by the U.S. Environmental Protection Agency indicates that Honda is the manufacturer of four of the top nine vehicles in tems of fuel economy.
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