Data available regarding how much college students paid for textbooks per year showed an average of $1,302 per year . A student researcher hypothesizes that in 2021 expenditures have decreased primarily due to the introduction of free online textbooks. To test the hypothesis, a sample of 90 students are selected and their expenditures on textbooks is recorded. It is found that the mean of the sample studied was $1230, with a standard deviation of $200. Use a 1% level of significance.

Is there statistical evidence of a reduction in expenditures on textbooks in 2021?

a) State the appropriate test (Type z or t) [1 mark]