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Question: Dental Anxiety Scale. Psychology students at Wittenberg University completed the Dental Anxiety Scale questionnaire (Psychological Reports, August 1997). Scores on the scale range from 0 (no anxiety) to 20 (extreme anxiety). The mean score was 11 and the standard deviation was 3.5. Assume that the distribution of all scores on the Dental Anxiety Scale is normal with μ = 11 and σ = 3.5.
(a) Suppose you score a 16 on the Dental Anxiety Scale. Find the z-value for this score.
(b) Find the probability that someone scores between a 10 and a 15 on the Dental Anxiety Scale.
(c) Find the probability that someone scores above a 17 on the Dental Anxiety Scale.
Formulate an alternative hypothesis for each of the following null hypotheses. (a) H0: Support for a presidential candidate is unchanged after the start of the use of TV commercials.
Historically, in the MBA program at Whatsamattu U., about 40% of the students choose a Leadership major, 30% choose Finance, 20% choose Marketing, and 10% choose no major. Does the most recent class of 200 MBA students fit that same pattern or has..
A suburban hotel derives its gross income from its hotel and restaurant operations. The owners are interested in the relationship between the number of rooms occupied on a nightly basis and the revenue per day in the restaurant.
a sample of 15 teachers from rhode island has an average salary of 35270 with a standard deviation of 3256. as ample of
How many percent of the subscribers rented a car during the past 12 months for personal reasons? Show work!
Suppose water pump 1 breaks down. What is the probability that it will take more than 30 minutes to repair?- What is the probability that at least one of the four water pumps will not be repaired within one hour?
a paired t-test was performed to test the null hypothesis h0 ?d 0 versus the alternative h1 ?d ? 0. the observed test
in a poker game 5 cards are dealt from a standard 52 card deck that has been well shuffled. you are the only player in
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
Betsy is interested in predicting how many 75-year-olds will develop Alzheimer's disease and is using a predictors level of education and general physical health graded on a scale from 1 to 10. But she is interested in using other predictor variab..
Then repeat the process of generating 1000 confidence intervals. Report the percent hit. How does this compare with the percent hit that you found in the previous exercise?
Write the general form of a regression equation that has a single predictor variable. Identify the criterion variable, the predictor variable, the regression constant, and the regression coefficient.
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