A Wildlife Biologist Wants to Determine the Mean Weight of Adult

Multiple Choice

A wildlife biologist wants to determine the mean weight of adult red squirrels. She captures 10 Squirrels she believes to be representative of the species and weighs them, finding a mean of 12.32 Grams and standard deviation of 1.88gm. Assuming these squirrels can be considered a random Sample of all red squirrels which of the following formulas gives a 95% confidence interval for the Mean weight of all squirrels?

A) $12.32 \pm 2.262 \left( \frac { 1.88 } { \sqrt { 10 } } \right)$
B) $12.32 \pm 2.228 \left( \frac { 1.88 } { \sqrt { 9 } } \right)$
C) $12.32 \pm 2.262 \left( \frac { 1.88 } { \sqrt { 9 } } \right)$
D) $12.32 \pm 2.228 \left( \frac { 1.88 } { \sqrt { 10 } } \right)$
E) $12.32 \pm 1.96 \left( \frac { 1.88 } { \sqrt { 10 } } \right)$