STATS 7 Study Guide - Midterm Guide: Los Angeles Times, General Social Survey, The Sacramento Bee

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Homework #1
2.19 For each of the following situations reported in the news, specify what
variable(s) were measured on each individual and whether they are best
described as categorical, ordinal, or quantitative.
a. A Los Angeles Times survey found that 60% of the1515adult Californians
polled supported a state law banning smoking in bars (Sacramento Bee, May 28,
1998, p. A3).
Supported the law banning smoking in bars (YES/NO), so Categorical.
b. According to the College Board News (December1998,p.1), “Students using
either one of two major coaching programs [for the SAT] were likely to
experience an average gain of 5 to 19 points on verbal and 5 to 38 points on
math.”
After using the two major coaching programs, students gain average of 5 to 19 points
on verbal and 5 to 38 points on math, so Quantitative because the data are numerical.
2.28 In the 2008 General Social Survey, participants were asked, “Would you say
that you are very happy, pretty happy, or not too happy?” The results were that
599 people said very happy, 1100 people said pretty happy, and 316 people said
not too happy (Data source: http://sda.berkeley.edu).
a. Write the frequency and relative frequency table for these data. Use
Table 2.1 on p. 20 for guidance.
Response Frequency Relative Frequency
Very happy 599 599/2015= 0.297
Pretty happy 1100 1100/2015= 0.546
Not too happy 316 316/2015=0.157
Total 2015 1
b. Draw a bar graph of the percentages (or proportions) found for the relative
frequency distribution in part (a).
c. What percent of respondents said either “very happy” or “pretty happy?”
Very happy: 29.7%
Pretty happy: 54.6%
2.39 In an experiment, one female and one male restaurant server drew happy
faces on the checks of randomly chosen dining parties. The figure for this
exercise is a dotplot comparing tip percentages for the female (n=22 checks) to
the tip percentages for the male (n=23 checks).
a. Compare the two servers with respect to the approximate centers
(locations) of their tip percentages.
The center for females’ checks is greater than that of males. Females around 27% and
males a little less than 18%.
b. Compare the two servers with respect to the variation (spread) among tip
percentages.
The data for females are more spread than males.
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Document Summary

After using the two major coaching programs, students gain average of 5 to 19 points on verbal and 5 to 38 points on math, so quantitative because the data are numerical. 2. 28 in the 2008 general social survey, participants were asked, would you say that you are very happy, pretty happy, or not too happy? the results were that. 599 people said very happy, 1100 people said pretty happy, and 316 people said not too happy (data source: http://sda. berkeley. edu): write the frequency and relative frequency table for these data. 1: draw a bar graph of the percentages (or proportions) found for the relative frequency distribution in part (a), what percent of respondents said either very happy or pretty happy? . 2. 39 in an experiment, one female and one male restaurant server drew happy faces on the checks of randomly chosen dining parties. The center for females" checks is greater than that of males.

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