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 (Type z or t) [1 mark]

b) State the null hypothesis

ALSO

Which is correct: a]H I p. Skim. I p. i: 1302 E]H I ,u = 1250 d] HI} I m Type a, b, cor d. Do not use brackets [1 mark] c] State the alternate hypothesis Which is correct: 3] HA I p'. s: 1302 b] 1931 :p, 3 1302 c]HA I p, *3: 1250' {HHA I p} = 1302 Type a, b,cor d. Do not use brackets. [1 mark] d} State the critical value {values]. If there are 2 values copy and paste the following sign: :I: [2 marks] e] Calculate the test statistic {Express your answer correct to 2 decimal places] [2 marks] f]: Make a decision. Which is correct: a] We reject the null hypothesis; in} We fail to reject the I Type a or b - no brackets [1 mark] g} State a conclusion. Which is correct: a] At 1% level of significance we found enough evidence to support the claim; b} At 1% level of significance we did not find enough evidence