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
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