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Homework assignment Week 2: Statistical Data Analysis: Descriptive Statistics, Graphical Representations, and Case Study Evaluations

Week 2 homework solving problems in descriptive statistics, visualization, and case study evaluations.

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    Homework assignment week 2 : Statistical Data Analysis: Descriptive Statistics, Graphical Representations, and Case Study Evaluations 7. For the data from the 1977 Stat. and Biom. 200 class for eye color, construct: Eye Color Number of Students Brown 11 Blue 10 Green 4 Gray 1 a. pie graph b. horizontal bar graph Pie chart Brown Blue Green Gray 0 2 4 6 8 10 12 Brown Blue Green Gray horizontal bar graph Number of Students

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    c. vertical bar graph d. a frequency table with the relative frequency of each eye color Eye Color Number of Students R Fi Brown 11 0.423 Blue 10 0.385 Green 4 0.154 Gray 1 0.038 26 1.000 0 2 4 6 8 10 12 Brown Blue Green Gray vertical bar graph Number of Students

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    9. Which of the box plots on the graph has a large positive skew? Which has a large negative skew? The Boxplot is an Indicator of Symmetry . If t he line is close to the center of the box and the whisker lengths are the same then sample is from a symmetric population. If the top whisker is much longer than the bottom whisker and the line is gravitating towards the bottom of the box, then sample is from population which is skewed to the right. While, if t he bottom whisker is much longer than the top whisker and the line is rising to the top of the box, then sample is from population which is skewed to the left. Here, Box plot B. has a large positive skew . And, Box plot C. has a large negative skew . 6. You recorded the time in seconds it took for 8 participants to solve a puzzle. These times appear below. However, when the data was entered into the statistical program, the score that was supposed to be 22.1 was entered as 21.2. You had calculated the following measures of central tendency: the mean, the median, and the mean trimmed 25%. Which of these measures of central tendency will change when you correct the recording error?

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