Find the confidence interval specified. Assume that the population is normally distributed.
-The football coach randomly selected ten players and timed how long each player took to perform a certain drill. The times (in minutes)were: $$\begin{array} { r r r r r }
12.9 & 13.3 & 13.3 & 7.7 & 11.7 \
9.9 & 12.5 & 6.5 & 10.8 & 12.2
\end{array}$$ Determine a 95% confidence interval for the mean time for all players.
A)12.80 to 9.40 minutes
B)9.50 to 12.70 minutes
C)12.70 to 9.50 minutes
D)9.40 to 12.80 minutes

Question

Find the confidence interval specified. Assume that the population is normally distributed.
-The football coach randomly selected ten players and timed how long each player took to perform a certain drill. The times (in minutes)were: $$\begin{array} { r r r r r } 
12.9 & 13.3 & 13.3 & 7.7 & 11.7 \
9.9 & 12.5 & 6.5 & 10.8 & 12.2
\end{array}$$ Determine a 95% confidence interval for the mean time for all players. 
A)12.80 to 9.40 minutes
B)9.50 to 12.70 minutes
C)12.70 to 9.50 minutes
D)9.40 to 12.80 minutes

Quizplus · Accepted Answer

The sample mean and standard deviation are calculated from the given data. Using the t-distribution for a 95% confidence interval with 9 degrees of freedom, the interval is calculated to be approximately 9.40 to 12.80 minutes.

Find the Confidence Interval Specified 12.913.313.37.711.79.912.56.510.812.2\begin{array} { r r r r r } 12.9 & 13.3 & 13.3 & 7.7 & 11.7 \\9.9 & 12.5 & 6.5 & 10.8 & 12.2\end{array}12.99.9​13.312.5​13.36.5​7.710.8​11.712.2​

Find the Confidence Interval Specified $\begin{array} { r r r r r } 12.9 & 13.3 & 13.3 & 7.7 & 11.7 \\9.9 & 12.5 & 6.5 & 10.8 & 12.2\end{array}$