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194 minutes remaining 14 OF 14 QUESTIONS REMAINING Question 12 20 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 tires (in miles) is normally distributed. Your answers may include symbols, words, and numbers. State the null and alternative hypotheses: . HO: u Blank 1 Blank 2 . H1: u Blank 3 Blank 4 Check the requirements required to conduct the hypothesis test: . The sample data come from a Blank 5 Blank 6 sample. . The data come from a population that is normally distributed OR the sample size is > Blank 7 . The population is large; the sample size is no larger than Blank 8% of the population size. Use StatCrunch to find the test statistic and P-value. Round to four decimal places. . test statistic = Blank 9 . P-value = Blank 10