Summary statistics are given for independent simple random samples from two populations. Use the pooled t-intervalprocedure to obtain the specified confidence interval.
-$\overline { \mathrm { x } } _ { 1 } = 71.6 , \mathrm {~s} _ { 1 } = 3.9 , \mathrm { n } _ { 1 } = 11 , \overline { \mathrm { x } } _ { 2 } = 67.9 , \mathrm {~s} _ { 2 } = 3.4 , \mathrm { n } _ { 2 } = 9$
Determine a $99 \%$ confidence interval.
A)$- 1.07$ to $8.47$
B) $0.38$ to $7.02$
C) $- 1.83$ to $9.23$
D) $- 0.53$ to $7.93$

Question

Summary statistics are given for independent simple random samples from two populations. Use the pooled t-intervalprocedure to obtain the specified confidence interval.
-$\overline { \mathrm { x } } _ { 1 } = 71.6 , \mathrm {~s} _ { 1 } = 3.9 , \mathrm { n } _ { 1 } = 11 , \overline { \mathrm { x } } _ { 2 } = 67.9 , \mathrm {~s} _ { 2 } = 3.4 , \mathrm { n } _ { 2 } = 9$
Determine a $99 \%$ confidence interval.  
A)$- 1.07$ to $8.47$
B) $0.38$ to $7.02$
C) $- 1.83$ to $9.23$
D) $- 0.53$ to $7.93$

Quizplus · Accepted Answer

The correct answer is A because the 99% confidence interval is (-1.07, 8.47).

Summary Statistics Are Given for Independent Simple Random Samples from Two