Joliet Junior College Random Sample Quiz

Description

A random sample of 48 calculus test scores has an average of 68.5 with a standard deviation of 12.1. The sample data was not too strongly skewed. Answer the following questions.

What is the standard error of \overline{x}

x¯

? Round to 2 decimal places.

Use the theory-based applet to find the lower bound of a 98% CI for \mu

μ

. Round to one decimal place.

Use the theory-based applet to calculate the upper bound of for a 98% CI for \mu

μ

. Round to one decimal place.

A 99% confidence interval for the average score on a calculus test is (54.6, 72.5) based on 24 tests. Answer the following questions based on this.

What was the value of the average test score or \overline{x}

x¯

? Round to 1 decimal place.

What is the margin of error? Round to 1 decimal place.