Chapter 3: Q 3.3. (page 100)
Of the mean, median and mode which is the only one appropriate for use with quantitative data.
Mode is appropriate for use with quantitative data.
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In Exercises 3.201-3.206, we have provided simple data sets for you to practice the basics of finding a
a. population mean
b. population standard deviation
3.205
How many standard deviations to either side of the mean must we go to ensure that for any data set, at least of the observations lie within?
Magazine Ads. Advertising researchers F. Shuptrine and D. McVicker wanted to determine whether there were significant differences in the readability of magazine advertisements. Thirty magazines were classified based on their educational level-high, mid, or low-and then three magazines were randomly selected from each level. From each magazine, six advertisements were randomly chosen and examined for readability. In this particular case, readability was characterized by the numbers of words, sentences, and words of three syllables or more in each ad. The researchers published their findings in the article "Readability Levels of Magazine Ads" (Journal of Adrertiving Reseanch, Vol. ). The number of words of three syllables or more in each ad are provided on the Weissstats site.
Explain why minimum and maximum observations are added to the three quartiles to describe better the variation in a data set.
The data set has observations and has mean and standard deviation . Approximately how many observations lie between and .
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