Question

1) A professor knows that in the past, the average amount of time spent studying the night before the first exam was 140

minutes with a normal distribution and a standard deviation of 75.1. The professor finds that the average amount of

time spent studying the night before the first exam for the current class of 40 students is 165 minutes.

a) Please identify the following values from the above study description.

The population mean (µ) equals ________________.

The population standard deviation (ơ) equals _________________.

The sample size (n) equals ______________________.

The sample mean (M) equals ____________________.

2) A z score question for you… (because there always is a z score question!)

A student earned a score of 82 on the first exam and finds that this score is located one and a half standard deviations

above the mean in a normal distribution. What is the z score that corresponds to this raw score of 82? (3 points)

(HINT: no calculations are necessary) 

Z = ____________________

Answer 1