An oil change shop claims that they will change your oil in under 15 minutes. To test this
claim, a consumer advocacy group takes a simple random sample of 10 customers and records
the number of minutes it took to complete oil changes for these customers. Assume that oil
change times are normally distributed. $$\begin{array} { | c | }
\hline \text { Minutes for Oil Change } \
\hline 8 \
\hline 2 \
\hline 7 \
\hline 12 \
\hline 14 \
\hline 11 \
\hline 25 \
\hline 8 \
\hline 43 \
\hline 15 \
\hline
\end{array}$$ Conduct a hypothesis test for the oil shop's claim about oil change times at the 5% level of
significance.
118

Question

An oil change shop claims that they will change your oil in under 15 minutes. To test this
claim, a consumer advocacy group takes a simple random sample of 10 customers and records
the number of minutes it took to complete oil changes for these customers. Assume that oil
change times are normally distributed. $$\begin{array} { | c | } 
\hline \text { Minutes for Oil Change } \
\hline 8 \
\hline 2 \
\hline 7 \
\hline 12 \
\hline 14 \
\hline 11 \
\hline 25 \
\hline 8 \
\hline 43 \
\hline 15 \
\hline
\end{array}$$ Conduct a hypothesis test for the oil shop's claim about oil change times at the 5% level of
significance.
118

Quizplus · Accepted Answer

The Answer of An oil change shop claims that they will change your oil in under 15 minutes. To test this
claim, a consumer advocacy group takes a simple random sample of 10 customers and records
the number of minutes it took to complete oil changes for these customers. Assume that oil
change times are normally distributed. $$\begin{array} { | c | } 
\hline \text { Minutes for Oil Change } \
\hline 8 \
\hline 2 \
\hline 7 \
\hline 12 \
\hline 14 \
\hline 11 \
\hline 25 \
\hline 8 \
\hline 43 \
\hline 15 \
\hline
\end{array}$$ Conduct a hypothesis test for the oil shop's claim about oil change times at the 5% level of
significance.
118

An Oil Change Shop Claims That They Will Change Your