a. Should you use the z distribution or t distribution? Why?

Level of measurement is interval/ordinal

b. State H0 and H1.

Ho no difference H1 difference

c. What is the critical value?

one or two tail unsure

d. What is the obtained statistic?

e. Should you reject the null hypothesis?

f. Is there sufficient evidence to support the manufacturer’s claim?

Ok my reakonings

Level of measurement is interval/ordinal and

Critical value depends on one or two tail 1.64 or 1.