Lab 1 Online-serenity witten

# Lab 1 Online-serenity witten - Name Serenity Witten Your...

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Name: Serenity Witten August 27, 2010 Your physical location: MATH Building Lab 1: Sections 3.1, 3.2, 3.3 and 3.4 A class of 20 students was asked to complete a short survey asking for their first name and the number of texts that they sent last week. The data set has been copied into the “Lab 1 data.doc” file. Use this data to complete the lab. 1. (5 points) Using SPSS, enter all first names only for the class into a column labeled “Name.” Use SPSS to take a simple random sample (SRS) of 5 students from this list. Write down the names that were selected, and then use the data collected to record the number of texts sent last week for each student selected. Repeat this process for 4 more SRS. SRS #1 1 2 3 4 5 Name Karl Chao Young Mike Gang Texts 15 12 53 21 15 SRS #2 1 2 3 4 5 Name Karl Zhaonan Young Duncan Gang Texts 15 10 53 14 15 SRS #3 1 2 3 4 5 Name Karl Jeff Mike David Callum Texts 15 28 21 17 0 SRS #4 1 2 3 4 5 Name Chao Allison Mike Gang Callum Texts 12 45 21 15 0 SRS #5 1 2 3 4 5 Name Karl Zhaonan Kathy Mike Elizabet Texts 15 10 13 21 20 2. (5 points) For each of these SRSs, find the sample mean for the number of texts sent last week by the students. (Add up the five numbers, and then divide by 5 for each SRS.) SRS #1 SRS #2 SRS #3 SRS #4 SRS #5 i x 23.2 21.4 16.2 18.6 15.8 Were all of the sample means in # 2 the same? Probably not. Sample statistics will vary from sample to sample. Our sample size is fairly small, so we have a lot of variability. The larger the sample size, the

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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 1 Online-serenity witten - Name Serenity Witten Your...

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