1.According to the US Department of Energy, the mean monthly expenditure on electricity for households was $100. A dubious customer does not believe this to be true and thinks the mean is higher. He gathers a random sample of 15 households, and computes a sample average of $120 with a sample standard deviation of $15. Assuming the true distribution of expenditures is normal, what critical value should he use to test this hypothesis at a 5% significance leveljQuery22403575010290748879_1599980151384

a.1.76

b.1.65

c.1.96

d.-1.76

e.-1.65

2.Continuing the setting of question 22, what is the conclusion of the hypothesis test?

a.Reject H₀and conclude that there is sufficient evidence to warrant acceptance of the claim that the mean expenditure is higher than $100 per month.

b.Fail to reject H₀and conclude that there is sufficient evidence to warrant acceptance of the claim that the mean expenditure is higher than $100 per month.

c.Reject H₀and conclude that there is not sufficient evidence to warrant acceptance of the claim that the mean expenditure is higher than $100 per month.

d.Reject H₀and conclude that there is sufficient evidence to warrant rejection of the claim that the mean expenditure is higher than $100 per month.

Fail to reject H₀and conclude that there is sufficient evidence to warrant rejection of the claim that the mean expenditure is higher than $100 per month.