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A researcher is investigating the physical characteristics that influence whether a person's face is judged as beautiful. The researcher selects a photograph of a women and then creates two modifications of the photo by (1) moving the eyes slightly farther apart and (2) moving the eyes slightly closer together. The original photograph and the two modifications are then shown to a sample of n=150 collage students, and each student is asked to select the "most beautiful: of the three faces. the distribution of responses was as follows:
original Eyes moved Eyes movedPhoto Apart Together51 72 27
Do the data indicate any significant preferences among the three versions of the photograph? Test at the .05 level of significance.
At the .01 significance level, is there a difference in the mean number of times men and women order take-out dinners in a month? What is the p-value?
Compute a 3-month moving average forecast of demand for April through January (of the next year).
What is the probability that a randomly selected vehicle's VMD will lie between 60,000 and 100,000 miles since its previous crash?
Assuming that the manufacturer's claim is correct, what is the probability the mean of the sample is 37,650 miles or less?
Suppose you are a researcher who has collected and analyzed a sample of values. When you perform a hypothesis test the p-value is calculated to be 0.051. Would you reject or fail to reject the null hypothesis? Defend your choice.
Find the expected value of the number of tests taken.
Evaluate the value of population proportion. Develop a 99% confidence interval for population proportion.
Women in the U.S. Air Force have hands that are 6.9 inches on the average (from the tip of the middle finger to the heel of the hand). The standard deviation is 0.34 inches. Assume that hand length is normally distributed.
When studying the simultaneous responses to two categorical questions, we should set up a:
Record the type of research design used. True lab experiment, quasi-experiment, field experiment, or correlation design.
Nicotine patches are often used to help smokers quit. Does giving medicine to fight depression also help? A randomized double blind experiment assigned 244 smokers to receive nicotine patches and another 245 to receive both a patch and the antidep..
Computer science instructor, 3 statistics instructors, and 4 science instructors. If an instructor is selected, find the probability of getting a science instructor or math instructor.
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