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Lab 1 Online

# Lab 1 Online - Name Your physical location Lab 1 Sections...

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Name: August 27, 2010 Your physical location: 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 Texts SRS #2 1 2 3 4 5 Name Texts SRS #3 1 2 3 4 5 Name Texts SRS #4 1 2 3 4 5 Name Texts SRS #5 1 2 3 4 5 Name Texts 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 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.

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