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One of the Behavioral Research Case Studies involved Agocha and Cooper's (1999) study of partner characteristics and intentions to practice safe sex. Below are the Pearson correlations between the likelihood that participants would discuss risks before having sex and several other variables.
a. In a stepwise regression analysis, which variable would enter the equation first? Why?
b. Can you tell which variable will enter the equation second? Why or why not?
c. Which variable is least likely to be included as a predictor in the final equation?
d. If a standard or simultaneous regression analysis was conducted on these data, what is the smallest that the multiple correlation between the five predictor variables and the criterion variable could possibly be? (This one will take some thought.)
i. how many strings of ten digits length can be formed using only the digits 12345? digits may be used more than once
the table gives population densities for ring-necked pheasants in number of pheasants per acre on pelee island
Over a period of years, toothpaste has received a mean rating of 5.9, on a 7-point scale, for overall customer satisfaction with the product.
four types of solar energy collectors were collected. the data is in the accompanying file.a construct an anova table.b
If you select a random sample of 16 cups and are willing to have an α = 0.05 risk of committing a Type I error, compute the probability of a Type II error (β) if the population mean amount dispensed is actually:
What percent spend less than $1,200 per year on reading and entertainment?
The remainder are defective. If 4 of the products are randomly selected, find the probability that all of them are acceptable.
Use the sample data and confidence level given below to complete parts (a) through (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n=970 and x=598 who said "yes." Use a 99% confidence level.
Assuming that these results are sample data randomly selected from the population of all past and future Olympic games
Use the Poisson distribution to approximate the probability that among 10,000 cars passing through this tunnel, at least one will have a flat tire.
Which of the following measures only the strength of a relationship?
A program was developed to improve nutrition among low-income residents in New York City. This program was evaluated by comparing NYC residents who were randomly assigned to the intervention group vs. residents assigned to the control group. The..
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