Aresearcher is interested in estimating the mean weight of a semi tracker truck to determine the potential load capacity. she takes a random sample of 17 trucks and computes a sample mean of 20,000 pounds with sample standard deviation of 1,500. she decides to construct a 98% confidence interval to estimate the mean. the degrees of freedom associated with this problem are

The degrees of freedom associated with this problem are 16.

Step-by-step explanation:

The degrees of freedom associated with a problem, independent of the confidence level, is the sample size subtracted by 1.

In this problem, we have that:

She takes a random sample of 17 trucks, so the sample size is 17.

This means that the degrees of freedom associated with this problem are 16.

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9

answer: your answer is a