1)  You want to find out the average number of friends people have on Facebook.   You decide to create a confidence interval answer this.  After surveying 50 people, you found a point of estimate of 124 and a standard deviation of 18.4.  Answer the following:

 

 (a) Find the MoE for a 90% confidence level.

 (b) Create a confidence interval at a 99% level.

 (c) Create a confidence interval at a 88% level.

 (d) Name two things that can be done to decrease the interval.

 (e) Using the same standard deviation, at a 99% level of confidence, how many people would need to be surveyed to have a MoE of 5?