OK, I am in big trouble in my Elementary Statistics class and I need help. We have a chapter test tomorrow. Long story short I have a 101% average in the class, so I have been doing extremely well. We went out of town 3 weeks ago to Atlanta and I missed 1 class. In this one clas I missed an important lecture and nothing has made sense since. We didn't have class last week so I took that opportunity to get a lot of work done in my Anatomy class, but now, and yes the night before the test I realize I can not answer any questions on the practice exam at all I am going to fail this test tomorrow and lose my A average which is really going to hurt me. I am so upset with myself, I can't believe I let myself get behind. I was just struggling so hard with anatomy.

Here is the 1st question on the review:

A sociologist found that in a sample of 49 retired men, the average number of jobs they had during their lifetimes was 7.2. The standard deviation of the sample was 2.1. Construct a 90% confidence interval for the mean number of jobs a man had during his lifetime.

Then interpret your result.

Does anyone know how to work that, I have the formulas but just don't understand how to use them.

Here is the 1st question on the review:

A sociologist found that in a sample of 49 retired men, the average number of jobs they had during their lifetimes was 7.2. The standard deviation of the sample was 2.1. Construct a 90% confidence interval for the mean number of jobs a man had during his lifetime.

Then interpret your result.

Does anyone know how to work that, I have the formulas but just don't understand how to use them.