Excel Practice #1 - Answers to Excel Practice Problems Part...

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Answers to Excel Practice Problems Part 1 Nicole Hammond & Camille Hooper Economics 261- Dr. Djeto Assané Fall 2011
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Problem #1: Relationship between time spent studying & grades received A.) Descriptive Statistics Table 1 Variable Mean Standard Deviation Minimum Maximum Time 38.7 7.60 25 48 Grade 71.9 14.71 47 90 Given the data set and subsequent summary statistics, the average time spent studying for this course is 38.7 hours, while the average grade score for this course is 71.9. The minimum and maximum for each variable create a range of 23 and 43, respectively. The ranges seem extremely large for a data set so small. Sixty percent of the data in the time category fall within one standard deviation of the mean. A standard deviation of 7.60 suggests there are some extreme outliers in this data set. Similarly, eighty percent of the data in the grade category fall within one standard deviation of the mean. A standard deviation of 14.71 suggests there are also some extreme outliers in this data set. The distributions of the data sets suggest they are a skewed distribution. B.) Correlation Coefficient Table 2 Variable Time Grade Time 1 Grade .901049 1 The correlation between time
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