The cost of a college education has increased at a much faster rate than costs in general over the past twenty years. In order to compensate for this, many students work part- or full-time in addition to attending classes.
At one university, it is believed that the average hours students work per week exceeds 20. To test this at a significance level of 0.05, a random sample of n = 20 students was selected and the following values were observed:26 15 10 4010 20 30 3640 0 5 1020 32 16 1240 36 10 0Based on these sample data, which of the following statements is true?A) The standard error of the sampling distribution is approximately 3.04.
B) The test statistic is approximately t = 0.13.
C) The research hypothesis that the mean hours worked exceeds 20 is not supported by these sample data.
D) All of the above are true.
Question 2
A test is conducted to compare three different income tax software packages to determine whether there is any difference in the average time it takes to prepare income tax returns using the three different software packages.
Ten different person's income tax returns are done by each of the three software packages and the time is recorded for each. Given this format and testing using an alpha level equal to 0.05, the critical value associated with the primary hypothesis test is:A) 3.555
B) 2.456
C) 19.385
D) 4.256
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