1. Which of the following will make a confidence interval narrower and more precise?
A. Larger sample size and higher confidence level
B. Smaller sample size and higher confidence level
C. Smaller sample size and lower confidence level
D. Larger sample size and lower confidence level Reset Selection
2. If Z is a standard normal random variable, the area between z = 0.0 and z =1.30 is 0.4032, while the area between z = 0.0 and z = 1.50 is 0.4332. What is the area between z = -1.30 and z = 1.50?
A. 0.0300
B. 0.0968
C. 0.0668
D. 0.8364