The average student IQ score for the MiraCosta student population is 100. I am predicting that my students have a significantly higher IQ score than the rest of the population, so I take a sample of 25 of my own students. I find that the average IQ score for my sample of students is 120 with a standard deviation of 5. Compute the appropriate t-test at an alpha level of .05.

a. What are the null and alternative hypotheses?

b. What cutoff score do we use?

c. What is the t score?

d. Do we reject or retain the null hypothesis?