Worksheet 2B Old Faithful The aim this worksheet is to practice techniques that

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Worksheet 2B Old Faithful The aim this worksheet is to practice techniques that we use to explore data sets. The of prior to analysis. provides an overview of the data and is step procedures outlined are often collectively referred to as an EDA exploratory data analysis) and there are four key steps: 1 Determine the overall shape of the distribution of data in your dataset 2 Describe the central tendencies of the data 3 Evaluate the spread of the data within your dataset In this exercise, we will be conducting the EDA using SPss. Work through the worksheet at your own pace, consult your neighbor, instructor, magic 8 ball, but be sure to answer all questions The data set we will be using in this exercise describes the timing and duration of eruptions of Old Faithful, in Yellowstone Park. The eruptions over a 23 day period were monitored and the duration of the eruption, as well as the intervals between eruptions were timed and recorded in minutes, during select periods each day. Step 1: Take an overview of the data and explore the central tendencies: 1. Open up SPSS and the open up the old faithful data set, available on Blackboard under a. What is the first page you see? The Sato Editor b. How do you switch to variable view? coun the bottom key clicking the ole vie tab to the Data view tab c, What useful info is available on this page? 1 you can 4 thL name s, tue is the vann ble, decima s, the Mut etc. Its a good way ediy info mation d. Is the data on the length and frequency of eruptions quantitative or qualitative? buano trative e. What is the single best way to get an overview of your data set using SPss? Histogram Write out the steps you will use in SPSS to get this. Analyze Gro fo Data or Varia ble vicu graphs, acy dialogues, thstogram, and move the nate ran able into vanable anc click o le

Explanation / Answer

Working on page 16

Summary

It contains 222 cases, data was collected on 23 different days & the duration of each eruption was recorded in minutes.

The Mean duration of eruption was 3.5761 (SD. 1.08) minutes, and the median was 4.000 minutes.

95% confidence limits for the mean duration of an eruption of this geyser area from 3.4328 to 3.7195 . This range indicates if we take the sample several times then the true population mean will lie in the interval 3.4328 to 3.7195 for 95% of the times.

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