Gas mileage Hoping to improve the gas mileage of their cars, a car company has made an adjustment in the manufacturing process. Random samples of automobiles coming off the assembly line have been measured each week that the plant has been in operation. The data from before and after the manufacturing adjustments were made are in the table below. It is believed that measurements of gas mileage are normally distributed. Write a
complete conclusion about the manufacturing adjustments based on the statistical software
printout shown below. $\begin{array}{lllllllllllllll}
\text { SET M1 } & 24 & 21 & 26 & 25 & 23 & 24 & 19 & 22 & 20 & 24 & 20 & 21 & 27 & 22 \
\text { SET M2 } & 22 & 24 & 28 & 28 & 27 & 24 & 22 & 24 & 27 & 25 & 27 & 23 & 28
\end{array}$
$\text { Two Sample T for M1 vs M2 }$
$\begin{array}{lllll}
& \mathrm{N} & \text { Mean } & \text { StDev } & \text { SEMean } \
\text { M1 } & 14 & 22.71 & 2.40 & 0.64 \
\text { M2 } & 13 & 25.31 & 2.29 & 0.64
\end{array}$
$95 \% \mathrm{Cl} \text { for } \mu_{2}-\mu_{1}:(0.74,4.45)$
$\text { T-Test } \left.\mu_{1}=\mu_{2} \text { (vs. } \mu_{1}

Question

Gas mileage Hoping to improve the gas mileage of their cars, a car company has made an adjustment in the manufacturing process. Random samples of automobiles coming off the assembly line have been measured each week that the plant has been in operation. The data from before and after the manufacturing adjustments were made are in the table below. It is believed that measurements of gas mileage are normally distributed. Write a
complete conclusion about the manufacturing adjustments based on the statistical software
printout shown below. $\begin{array}{lllllllllllllll}
\text { SET M1 } & 24 & 21 & 26 & 25 & 23 & 24 & 19 & 22 & 20 & 24 & 20 & 21 & 27 & 22 \
\text { SET M2 } & 22 & 24 & 28 & 28 & 27 & 24 & 22 & 24 & 27 & 25 & 27 & 23 & 28
\end{array}$
$\text { Two Sample T for M1 vs M2 }$
$\begin{array}{lllll} 
& \mathrm{N} & \text { Mean } & \text { StDev } & \text { SEMean } \
\text { M1 } & 14 & 22.71 & 2.40 & 0.64 \
\text { M2 } & 13 & 25.31 & 2.29 & 0.64
\end{array}$
$95 \% \mathrm{Cl} \text { for } \mu_{2}-\mu_{1}:(0.74,4.45)$
$\text { T-Test } \left.\mu_{1}=\mu_{2} \text { (vs. } \mu_{1}<\mu_{2}\right): T=2.88 \quad P=0.0041 \quad D F=24.98$

Quizplus · Accepted Answer

The Answer of Gas mileage Hoping to improve the gas mileage of their cars, a car company has made an adjustment in the manufacturing process. Random samples of automobiles coming off the assembly line have been measured each week that the plant has been in operation. The data from before and after the manufacturing adjustments were made are in the table below. It is believed that measurements of gas mileage are normally distributed. Write a
complete conclusion about the manufacturing adjustments based on the statistical software
printout shown below. $\begin{array}{lllllllllllllll}
\text { SET M1 } & 24 & 21 & 26 & 25 & 23 & 24 & 19 & 22 & 20 & 24 & 20 & 21 & 27 & 22 \
\text { SET M2 } & 22 & 24 & 28 & 28 & 27 & 24 & 22 & 24 & 27 & 25 & 27 & 23 & 28
\end{array}$
$\text { Two Sample T for M1 vs M2 }$
$\begin{array}{lllll} 
& \mathrm{N} & \text { Mean } & \text { StDev } & \text { SEMean } \
\text { M1 } & 14 & 22.71 & 2.40 & 0.64 \
\text { M2 } & 13 & 25.31 & 2.29 & 0.64
\end{array}$
$95 \% \mathrm{Cl} \text { for } \mu_{2}-\mu_{1}:(0.74,4.45)$
$\text { T-Test } \left.\mu_{1}=\mu_{2} \text { (vs. } \mu_{1}<\mu_{2}\right): T=2.88 \quad P=0.0041 \quad D F=24.98$

Gas Mileage Hoping to Improve the Gas Mileage of Their