1) Select any 5 states and write down income rounded by thousands (for example, Alabama - 44, Alaska - 72 and so on). This will be your sample collection.

Alaska-72

Hawaii-68

New York-59

Texas-53

Puerto Rico-20

2) Calculate Mean and Standard Deviation for your sample. 3) Based on sample statistics estimate Confidence Interval for Population Mean. Because population standard deviation is not known, use Appendix Table for t-Distribution to find t-value for your case. For Confidence Level use 90%. 4) Consider the Normal Distributionwith Meanequalyour sample mean andStandard Deviation equalyour sample standard deviation. Find x-value that identifies the position of top 5% in thisNormal Distribution (z-value should be found fromAppendix Table for Normal Distribution).