State college is evaluating a new English composition course for freshman. A random sample of n=25 freshman is obtained and the students are placed in the course during the first semester. One year later, a writing sample is obtained from each student and the writing samples are graded using a standardized evaluation technique. The avg score for the sample is M=76. For the general population of college students, writing scores form a normal distribution with a mean of 70.

Assume a two-failed test with an alpha of .05. If the writing scores of the pop have a standard deviation of 20. Which of the following statements is true about the null hypothesis and significant difference?

a) you cannot reject the null, you cannot conclude the course had significant effect

b) you can reject the null, you can conclude it hadsignificant effect

c) you cannot reject the null, you can conclude it hadsignificant effect

d) you can reject the null, you cannot conclude it hadsignificant effect