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In a poll, respondents were asked whether they had ever been in a car accident. 177 respondents indicated that they had been in a car accident and 107 respondents said that they had not been in a car accident. If one of these respondents is randomly selected, what is the probability of getting someone who has been in a car accident?
What is a chi-squared test used for? What is the typical null and alternate hypothesis when doing a chi-squared test?
Michelle is a counselor at the local crisis center. She wishes to determine if there is a relationship between the gender of an individual and the amount of alcohol consumed.
Using a two-tailed test with a=.05 is there a significant difference between the two treatment conditions? c. compute r2 to measure the percentage of variance accounded for the by the treatment effect.
The owner of a local night club has recently surveyed a random sample of n=250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30.
Verify that the fitted values have the same mean as the actual y-values, and that the residuals have mean zero and show that the variance of the fitted values plus the variance of the residuals adds up to the variance of y. Find the R-squared.
Assuming that Richard guesses on all eight questions, find the indicated probabilities. What is the probability that he will answer all questions correctly?
A new president at Big State University has made student satisfaction with the enrollment and registrations process one of her highest priorities.
From Company B, 850 stereos are purchased and 6% are found to be defective. Given that a stereo is defective, find the probability that it came from Company A.
Let x be average number of employees in group health insurance plan and y be average administrative cost as percentage of claims. Determine sample correlation coefficient.
Let sample s approximate population sigma. How come the t- table in the AP booklet has degrees of freedom entries way past 30 ??? What am I missing??
It was thought that hypnosis would lower a person's desire to smoke. A researcher decided to investigate this hypothesis using a paired-sample sign test in which the number of cigarettes/day smoked by subjects was recorded before and after hypnosi..
The accompanying two histograms represent the distribution of acceptance rates (percent accepted) among 25 business schools in 1995. The histograms use different class intervals, but are based on the same data. In each class interval, the left endpoi..
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