The mean annual tuition and fees for a sample of 15 private colleges was $41,200 with a standard deviation of $5,300. A dotplot shows that it is reasonable to assume that the population is approximately normal. You wish to test whether the mean tuition and fees for private colleges is different from $38,000. State the null and alternate hypotheses.

The mean annual tuition and fees for a sample of 8 private colleges was $33,700 with a standard deviation of $5,800. A dotplot shows that it is reasonable to assume that the population is approximately normal. You wish to test whether the mean tuition and fees for private colleges is different from $37,400. Compute the value of the test statistic and state the number of degrees of freedom. A) -0.638; 8 degrees of freedom B) -0.638; 7 degrees of freedom C) -1.804; 8 degrees of freedom D) -1.804; 7 degrees of freedom

The mean annual tuition and fees for a sample of 12 private colleges was $40,500 with a standard deviation of $5,000. A dotplot shows that it is reasonable to assume that the population is approximately normal. You wish to test whether the mean tuition and fees for private colleges is different from $37,400. State a conclusion regarding Ho. Use the 0.01 level of significance.