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A ten year old survey found that the average income of sole proprietor CPA's was $74,914. To update this information, a new survey of 112 proprietor CPA's was taken and it showed a mean of $74,695. Use a 5% level of significance to test whether the average income sole proprietor CPA's has increased. assume a population standard deviation of $14.530. Report the value. What is is your conclusion?
Suppose the organizers of the study are reconsidering their sample-size estimate. How many participants should be enrolled in each of the active and control intervention groups to achieve 80% power if a two-sided test is used with α = .05
Compute the coefficient of correlation and the coefficient of determination and determine the regression equation.
When would you use a two population test with a small sample size at your place of employment, in your education, or in politics?
1) What is correlation? 2) What is an example of two variables that are likely to be correlated because they are both changing over time?
he length of time a person spends waiting in a physician's office for an appointment can be a frustrating experience. The results below are the responses of internists from two multispecialty group practices to the following question:
Describe what do you mean by conditional probability. Give clinical example to support the explanation.
In both cases, give a number of data points, n, and a correlation coefficient, r. Draw a number of data points, n, and a correlation coefficient, r. Tell whether the correlation is significant at 0.05 or 0.01 level, explain.
At 5% level of significance, is there evidence of difference in mean life of bulbs made by the 2 kinds of machines. What is your conclusion?
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02.
A group of 20 sales associates agree to go through a week-long sales class to improve their productivity. The amount of their sales are computed for one month before and one month after the training course.
Derive the probability that a receptor is occupied by a ligand using a model which treats the L ligands in solution as distinguishable particles.
The study found that men who had participated in some vigorous activity at least twice a week in high school, college, and up to age 40 had a 60% reduced risk of Parkinson's disease developing. The study found no such reduction for women. What typ..
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