# Lab 7 - Name Serenity Witten Friday T.A name/Class...

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Name: Serenity Witten October 15, 2010 Friday T.A. name/Class time:   Xiang Han, Online Monday/Wednesday lecturer:   Ellen Gundlach Lab 7: Sections 7.1, 7.2 When you have 2 columns of data, sometimes it can be tricky to tell the difference between a Matched Pairs and a 2-Sample Comparison of Means problem. Here’s how you know: Matched pairs : You get 2 measurements on the same unit (for example, before and after measurements or left-hand vs. right hand for each individual). 2-Sample Comparison of Means : You have 2 separate populations from which you get 2 independent samples, and you just measure each unit once (for example, freshmen vs. seniors or men vs. women). Here is the fuel economy data that you will use in this lab (you will type it into SPSS): Gas A 12.6 13.4 14.2 15.8 16.3 17.1 18.4 19.2 20.7 21.1 19.4 14.6 17.5 15.3 16.6 Gas B 13.9 12.8 14.9 17.5 15.8 16.3 18.9 19.5 21.8 22.3 20.2 16.6 17.2 15.5 16.7 Read the two stories below about separate experiments designed to determine with the fuel economy using Gas A is different from the fuel economy using Gas B. Story #1 : Thirty vehicles were selected for this test. Fifteen are assigned to use Gas A and the other fifteen to use Gas B. The driver of each vehicle was instructed to use three tanks of the assigned brand and keep records of the miles per gallon. Story #2: Fifteen vehicles were selected for this test. The driver of each vehicle was instructed to use three tanks of one brand, keep records of the miles per gallon, and then do likewise using three tanks of the other brand. The starting gasoline for each driver/vehicle combination was randomly assigned. 1.

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## This note was uploaded on 11/08/2010 for the course STAT 301 taught by Professor Staff during the Spring '08 term at Purdue.

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Lab 7 - Name Serenity Witten Friday T.A name/Class...

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