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Lab #A

Lab #A (Descriptive Statistics)


A large group of grade school teachers throughout the US are asked to provide information regarding the television viewing habits of their students. Each of you have been assigned data from a 12-student classroom data set

For questions 1-6 treat your data as a population.

1. What is the mean?

2. What is the sum of x?

3. What is the sum of x-squared?

4. What is the population variance?

5. What score reflects the 97th percentile?

6. What percentage of scores fall between the mean and a score of 30?

For question 7-9 treat your data as a sample.

7. Find the 95% confidence interval around the mean.

8. Discuss what this interval means.