minutes remaining 14 OF 14 QUESTIONS REMAINING Blank 10 Add your answer Question 13 8 Points A shipping firm suspects that the mean life (in miles) of a certain brand of tire used by its trucks is less than the 40,000 miles advertised by the manufacturer. To check the claim, the firm randomly selects and tests 18 of these tires and observes a mean lifetime of 39,300 miles with a standard deviation of 1,200 miles. At a = 0.05, test whether there is sufficient evidence to support the shipping firm's claim. Assume that the distribution of the life of these ties (in miles) is normally distributed. Referring to the P-value you found in Question 12, select the correct decision and conclusion. Reject the null hypothesis. There is not sufficient evidence to conclude that the mean life (in miles) of this brand of tire is less than the 40,000 miles advertised by the manufacturer. Reject the null hypothesis. There is sufficient evidence to conclude that the mean life (in miles) of this brand of tire is is B indeed 40,000 miles as advertised by the manufacturer. Reject the null hypothesis. There is sufficient evidence to conclude that the mean life (in miles) of this brand of tire is C less than the 40,000 miles advertised by the manufacturer. Do not reject the null hypothesis. There is sufficient evidence to conclude that the mean life (in miles) of this brand of tire is less than the 40,000 miles advertised by the manufacturer. Accept the null hypothesis. There is sufficient evidence to conclude that the mean life (in miles) of this brand of tire is is indeed 40,000 miles as advertised by the manufacturer