How Do They Know My Opinion?

Interim 2000

Notation: n manditory problem (n) helper problem {n} thought problem [n] ungraded problem Bracketed problems do not have to be turned in. Chap Prob Description/Notes ==== ==== ================= Homework 10 13 1 postage stamps 2 inflation by decade 4 weighting of items in the CPI [5,8] problems with CPI 6 medical care index 7 birthday money [10] other price indexes 11 updating the CPI [12] percentage increase vs. index value 13 bracket creep 14 COLAs [15] leading economic indicators Supplemental problems: 1. Suppose a certain medical condition affects 3 percent of the population. You sample 400 Calvin College graduates and find that 20 of them have the condition. Is this difference (between the general population and Calvin alumni) statistically significant? Explain. 2. Your friend claims to have ESP and be able to tell the suit (clubs, diamonds, hearts, or spades) of a card you are looking at without actually seeing it. You don't believe it, so you conduct an experiment in which you repeatedly shuffle a deck of cards, draw one card, and look at it while your friend tries to guess the suit. You did this 100 times and your friend was correct 32 of those 100 times. "See, I got more than 25%," your friend boasts. Should you be impressed? How likely would it be to get 32 (or more) of 100 correct by simply guessing? 3. If you have a choice between a 1-tailed Z-test and a 2-tailed Z-test, which will have the larger p-value? Why?

Homework 11 14 1-2 what's the trend? seasonal component? 6 displaying homocides 7 rates per 100,000 13 seasonal adjustments 14 computer sales drop 15 presidential salary 16 adjusting the dow jones for inflation

This page maintained by:

Randall Pruim

Department of Mathematics and Statistics

Calvin College

rpruim@calvin.edu