1. A simple random sample of 400 students is taken at a large university. The average height of the sampled students is 68 inches and the SD is 2 inches. The distribution of heights in the sample follows the normal curve very closely.

An approximate 68% confidence for the average height of students at the university is 68 inches plus or minus ____________ inches.

Approximately 68% of the students in the sample have heights in the range 68 inches plus or minus ____________ inches.