AN INTRODUCTION TO STATLETS

AN INTRODUCTION TO STATLETS

Web site: http://www.statlets.com/statletsindex.htm

INTERNET ACCESS

Version 1.1B, MENU VERSION

Class data file:

Female = 1 Male = 2

Blue = 3 brown = 4 green = 5

Biology = 6 chemistry = 7 compsci = 8 geology = 9 health = 10 other = 11

How to load data into Statlets:

Click on data file.

EDIT, SELECT ALL, COPY

Then go to Statlets.

CLIPBOARD, click inside the clipboard and do CNTL V

The data is now in the clipboard.

DATA, CLIP-IN

Exercise 1: We just looked at a histogram for height and played with the OPTIONS button. Do the same for weight. What happens if you change the limits? The bin size?

Exercise 2: Open Statlets, load in the data, do a t-test on weight. (ANALYSE,ONE SAMPLE, ONE VARIABLE ANALYSIS, t-test) Test H_o: m=98lbs. Do you reject the null hypothesis? What is the 95% confidence interval?

Homework Problem: Open Statlets, load the data. After speaking to the person who put down that they were 8’7" we found out that they actually wrote 5’7" but the 5 looked like an 8. Find this outlier in the data in the Statlets data screen and change 103.0" to 67.0". What is the 95% confidence interval? Then do a t-test on H_o: m=68". Do we reject at 5%? Give another reason why you know this to be the case. For what value of m would we not reject at 5%?