To estimate the average students' scores in a standardize test, a sample of 35 scores yielded a mean of 80 and a standard deviation of 9. what is a lower limit for a 98% confidence interval for the population mean?

The lower limit for a 98% confidence interval for the population mean is 79.40.

Step-by-step explanation:

Given : To estimate the average students' scores in a standardize test, a sample of 35 scores yielded a mean of 80 and a standard deviation of 9.

To find : What is a lower limit for a 98% confidence interval for the population mean?

Solution :

The confidence interval formula is given by,

The lower limit is

Where, is the mean

is the standard deviation

n=35 is the number of element

at 98% is 2.33.

Substitute all values in the formula,

Therefore, The lower limit for a 98% confidence interval for the population mean is 79.40.

5/12, or 5: 12

step-by-step explanation: