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Childhood participation in sports, cultural groups, and youth groups appears to be related to improved self-esteem adolescents. In a representative study, a sample of n = 100 adolescents with a history of group participation is given a standardized self-esteem questionnaire. For the general population of adolescents, scores on this questionnaire forma a normal distribution with a mean of u = 40 and a standard deviation of o = 12. The sample of group participation adolescents has an average of M = 43.84 Use a two-tailed test with x = .01.
a. Does this sample provide enough evidence to conclude that self-esteem scores for these adolescents are significantly different from those of the general population? Use a two-tailed test with x =.01.
In a sample of 50 members of a local health club you find that 12 of these members meet weekly with a physical fitness trainer and that the average body mass index (BMI) of these 12 members is less than the average BMI of the other 38 club members..
A researcher has been measuring the time for pairs of 8 year olds who have just met each other to work together to solve a problem. Construct a distribution table for these data. include the colums and values for proportion and percentage.
General Motors pays for employee education. The HR director would like to conduct a study on the average GPA of employees who have used this benefit to complete their degrees using a sample of education records over the past 10 years.
One of the most commonly used statistical techniques is the comparison of two means, also known as the t-test (for this you need quantitative, or interval level data).
Other group (drawing 6 slips without replacement from among 45). What is the probability that at least one of the shifts will be unrepresented in that sample of workers?
Determine the variance of firm's profit for the month.
Use the mean, median, and mode to make a statement about the difference in performance for city and highway driving.
Southeastern Bell stocks a certain switch box at its central warehouse for supplying field service offices. The yearly demand for these connectors is 15,000 units.
When studying the simultaneous responses to two categorical questions, we should set up a:
Calculate the value of Pearson correlation. Illustrate what information is provided by the numerical value of the Pearson correlation.
Mr. James McWhinney, President of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales.
Assume we have a population of scores with a mean of 975 and a standard deviation of 15. Assume that the distribution is normal. Provide answers to the following questions:
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