B. Samples are chosen at random from the population. C. Every other element in a population is chosen. D. Only the first half of a population is selected. 7. Look at the survey questions that Good Tunes sent to their customers. What kind of variables and scales of measurement do the questions concerning overall service and quality of the items purchased represent? A. Categorical variables measured on an ordinal scale. B. Categorical variables measured on the nominal scale. C. Categorical variables measured on the interval scale. D. Continuous variables measured on a ratio scale. 8.
The number of leaves at present on the trees in a yard is an example of a continuous variable. True False 9. The weight of each page of your textbook is an example of a numerical variable measured on a ratio scale. TrueFalse 10. Considering the various types of tables and charts introduced in this chapter, which table, chart, diagram or plot would you use to depict categorical data for two variables in a visual format? A. A side-by-side bar chart. B. A contingency table. C. A pie chart. D. A scatter plot/diagram. 11. How might an extreme value in the sample data set affect the value of the mean?
A. All values are treated equally when determining the mean so an extreme value cannot affect it. B. One extreme value is still only one value, so it cannot affect the mean very much. C. An extreme value cannot affect the mean if it is close to the mean. D. Since all values are summed, any extreme value can influence the mean to a large extent. 12. When a distribution of values is skewed to the right, is the value of the median less than or greater than the mean? A. The median is greater than the mean. B. The median is less than the mean. C. The mean and median should be the same. D.
Have you ever compared your own childhood with the childhood of kids nowadays? What do you feel when looking at your children, little siblings or any young person in your family spending a whole day stuck in front of a computer or laying on a sofa watching television? Have you ever thought about the impact that the overexposure to the media produces over the youth? The truth is that, nowadays, the ...