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Researchers wanted to explore self-esteem in adolescent boys and adolescent girls. Each respondent completed a 10-item self-esteem scale (they chose one rating for each item from a Likert-type scale, 1 = strongly disagree and 5 = strongly agree). The sum of the 10 ratings was each respondent's self-esteem score. Their results were: t = 2.01, d = .90 (40 girls, 40 boys).
1) What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
2) What was the purpose of calculating a Cohen's d? When is a Cohen's d calculated? Interpret d=.90. What does it mean in this example?
3) What if the researcher compared the adolescent boys before treatment and again after treating them for depression? What type of t-test would be most appropriate in this case, and why?
What is the value of the sample test statistic? (Round your answer to two decimal places.) Find the P-value of the test statistic. (Round your answer to four decimal places.)
Determine the probability that the project will be completed in 90 days or less.
Develop a joint probability table for these data. If a student goes full time, determine the probability that school quality is first reason for selecting a school?
Provide a brief description of the main features of these data from the scatter plot and Describe why you would use performance as the predictor variable and performane related pay as the dependent variable in such a model.
Normalized matrix for one decision criterion at Firm T is given below.
Findout the normal model for the given proportions. The professor has every student toss a coin 50 times also calculated the proportion
Let x = number of the ball obtained on any selection. Then the probability distribution for x is given by:
Are all the events in this distribution mutually exclusive? Describe in detail.
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
A recent study reported that the prevalence of hyperlipidemia (defined as total cholesterol over 200) is 30% in children 2-6 years of age. If 12 children are analyzed,
An experiment consists of making 80 telephone calls in order to sell a particular insurance policy.
Of the adults in Jefferson County, 10% have had CPR training
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