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Sample Questions:
| Classify each of the following as qualitative (categorical) variables or as quantitative variables. For those which are quantitative, further classify as either discrete or continuous | ||
| (a) | Names of FHSU Math 250 on line students | |
| (b) | Price of your house (in dollars) | |
| (c) | A randomly selected integer number between 0 and 100, inclusive | |
| (d) | The distance from the Earch to the Sun |
| Identify the type of sampling (random, stratified, systematic, or cluster) that best describes each of the following cases: |
| Randomly selecting 20% of the students in each grade level (first, second, third, fourth, fifth) and including those students selected in the sample |
| Select every 50th name on the student list to be included in the sample |
| Randomly selecting two FHSU on line sections and including all students from those two sections in the sample |
| 18. | In 2012 at a certain small business in Kansas City, MO, the owner earns $665,000, four middle level managers each earn $55,000, and eighteen workers earn $38,000 each. Calculate the mean and the median of this data. Which of these two measures better represents the middle(average) salaries at this office? Why? |
| 13. | A survey of 210 registered voters revealed that 107 of them plan on voting for the incumbent. Find a 95% confidence interval for the proportion of all registered voters who plan on voting for the incumbent. Does it appear statistically valid to conclude that more than 50% of all registered voters plan on voting for the incumbent? Why or why not? |
| 16. | A social worker is concerned about the number of prescriptions elderly patients take per day. She would like to create a 90% confidence interval with a maximum error of 0.5 prescriptions/day. Assuming 5.2 is a good estimate of the population standard deviation, what is the minimum number of patients she must sample? |
