The Bureau of Labor Statistics reported that the average yearly income of dentists in the year 2012 was 110,000 . A sample of 81 dentists, which was taken in 2013, showed an average yearly income of 120,000 . Assume the standard deviation of the population of dentists's incomes in 2012 is 36,000.
a. We want to test and determine if there has been a significant increase in the average yearly income of dentists. Provide the null and the alternative hypotheses.
b. Compute the test statistic.
c. Determine the p-value; and at a 5 level of significance, test the hypotheses.
Question 2
A description of how the probabilities are distributed over the values the random variable can assume is called a(n) _____.
a. probability distribution
b. probability function
c. random variable
d. expected value
(a) Mean duration (days) and (b) average maximum depth (mm) of snow cover throughout northern latitu
Many former slaves understood that illiteracy was an implement of bondage. The Freedmen’s Bureau bui
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Distribution of the Income of Americans
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As a result of a hole in the graph, which of the following functions does not have an average ...