Communicating with Databases in Natural Language. by Wallace M.

By Wallace M.

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Thus, the mean represents proportion of passengers who survived the ship’s sinking. 8 Frequency Distribution and Mean of a Dichotomous Variable Compute the mean using the Frequencies procedure. From the frequency distribution (Fig. 3%. 32. sav” contains information on the size (number of books in the collection) and staff in 22 college libraries. Use this file to perform the following analyses with SPSS: a. Determine the mean and median of the distribution of staff using the Frequencies procedure.

Sav” contains information on the size (number of books in the collection) and staff in 22 college libraries. Use this file to perform the following analyses with SPSS: a. Determine the mean and median of the distribution of staff using the Frequencies procedure. How do these measures compare? What do you think accounts for the differences? b. What value is at the 10th percentile? The 90th percentile? c. Create a histogram of the variable. Describe the distribution. Do any of the observations seem to be outliers?

In the display box, click on the Statistics option. Click on OK. In addition to the mean, this procedure lists the median and several other descriptive statistics (see Fig. 7). For instance, the median is 14 weeks. We will discuss some of the other statistics, such as the variance, standard deviation, and range in the Chapter 4. Proportion as a Mean There is an exception to the rule that requires a variable to have numerical properties in order to calculate the mean — it is the dichotomous categorical variable.

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