An automobile manufacturer has claimed that his car averages at least $30 \mathrm{~m}$.p.g. on the highway. A random sample of 16 such cars finds an average of $25 \mathrm{~m}$. p.g. with a standard deviation of $8 \mathrm{~m} . p . g$.
-Conduct the hypothesis test if $\alpha=0.01$.

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The Answer of An automobile manufacturer has claimed that his car averages at least $30 \mathrm{~m}$.p.g. on the highway. A random sample of 16 such cars finds an average of $25 \mathrm{~m}$. p.g. with a standard deviation of $8 \mathrm{~m} . p . g$.
-Conduct the hypothesis test if $\alpha=0.01$.

An Automobile Manufacturer Has Claimed That His Car Averages at Least