A researcher is interested in testing whether college students send more or fewer texts per day, relative to the general population. The researcher finds out that the population average of texts sent per day is = 112, but is unable to find out the population standard deviation.

This researcher then recruits 25 college students, and asks about their texting. They report a sample mean of M = 120, with a SS= 1200

Based on the above information, complete the following:

a. Compute and report the sample variance s²(1 point)

b. Compute and report the estimated standard error (s_M) (1 point)

c.Compute and report the value of the t-test for the sample (t=?). (1 point)

d. How many degrees of freedom does this t-test have? (1 point)

e. Assuming a two-tailed test with alpha = 0.05, was this t-test significant? Explain how you know. (2 points)

f. What is the effect size (estimated Cohen's d) for the difference? Include the value for the estimated Cohen's d and the size (small, medium, large) of the effect. (1 point)