1) 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 100 students are selected and their expenditures on textbooks is recorded. It is found that the mean of the sample studied was $1250, with a standard deviation of $280. Use a 1% level of significance.

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

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

b) State the null hypothesis

Which is correct: a) Ho : u > 1302 b) Ho : u 1302 c) HA : M 68% c)Ho : M 68% c) HA : u