The weights at birth of five randomly chosen baby giraffes were 111, 115, 120, 103, and 106 pounds. Assume the distribution of weights is normally distributed. Find a 95% confidence interval for the mean weight of all baby giraffes. Use technology for your calculations. Give the confidence interval in the form "estimate ± margin of error." Round to the nearest tenth of a pound.
A)110.0 ± 8.5 pounds
B)111.0 ± 8.5 pounds
C)111.5 ± 9.0 pounds
D)There is not enough information given to calculate the confidence interval.

Question

Quizplus · Accepted Answer

The sample mean is 111.0 pounds, and using a t-distribution with 4 degrees of freedom, the margin of error is approximately 8.5 pounds.

The Weights at Birth of Five Randomly Chosen Baby Giraffes