Step 1 :A simple random sample of size $n$ is drawn from a population that is normally distributed. The sample mean, $\bar{x}$, is found to be 114 , and the sample standard deviation, $\mathrm{s}$, is found to be 10.
Step 2 :Compare the results to those obtained in part (a). How does decreasing the level of confidence affect the size of the margin of error, $E$ ?
Step 3 :The margin of error, E, is calculated using the formula E = Z * (s/√n), where Z is the Z-score corresponding to the desired level of confidence, s is the sample standard deviation, and n is the sample size.
Step 4 :As the level of confidence decreases, the Z-score decreases. Since the Z-score is a multiplier in the formula for E, a decrease in the Z-score will result in a decrease in E.
Step 5 :Therefore, as the level of confidence decreases, the size of the interval decreases.
Step 6 :\(\boxed{\text{Final Answer: The correct answer is C. As the level of confidence decreases, the size of the interval decreases.}}\)