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.