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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.
Your boss has determined that on Wednesday, 5 random employees on the line to have a chance to obtain a $25 bonus if they produce more XT34's than 84% of all other employees on the line.
A stationery store to estimate the mean retail value of greeting cards purchased by its customers when they visit the store. A random sample of 15 customers indicates a mean amount of $2.55 with a standard deviation of $0.44 per customer per visi..
What are the requirements that must be met for a regression analysis? What happens if these requirements are violated? Why is the analysis of residuals important?
If on the other hand, he believes that the probability that he will get offers from both companies is 0.5, what is the probability that he will get at least one offer from these two companies?
Give an example of some data that you could analyze with a Chi Square. Discuss the level of measurement that you would need to use this test.
Suppose 5.9% of certain population use public transportation to get to work. You randomly select 380 workers and ask them if they use public transportation to get to work.
The null hypothesis is that there was no change in average liquor consumption. State this formally in terms of µ.
The following data resulted from a taste test of two different chocolate bars. The first number is a rating of the taste, which could range from 0 to 5, with a 5 indicating the person liked the taste.
An assumption for a significance test of the correlation coefficient is that the populations, the variance of each variable is the same at each point of the other variable.
Do you benefit by using a cum sum chart rather than a control chart?
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
Test whether the mean rate is less than 6%. Use P-value approach.
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