Question

7. Cluster samples typically cost less but they also increase sampling error. A. True B. False

8. Your gender is a nominal variable. A. True B. False

9. Your final grade in a course (A, B, C, D, E) is a nominal variable. A. True B. False

10. The values of quantitative data are categories. A. True B. False

11. Nominal data are also called qualitative or categorical data. A. True B. False

12. A variable is some characteristic of a population or sample. A. True B. False

13. With nominal data, there is one and only one way the possible values can be ordered. A. True B. False

14. You cannot calculate and interpret differences between numbers assigned to nominal data. A. True B. False

15. Which of the following situations is best suited for a pie chart? A. The number of dollars spent this year on each type of legal gambling. B. The percentage of a charitable donation that goes to administrative costs vs. directly to the charity. C. The number of students in your class who received an A, B, C, D, F on their exam. D. All of these choices are true.

16. Which situation identifies when to use pie charts and/or bar charts? A. You want to describe a single set of data. B. Your data is nominal. C. You want to show the number or the percentage of individuals in each category. D. All of these choices are true.

17. Which of the following statements about histograms is false? A. A histogram is a summary of numerical data. B. A histogram is made of a series of intervals, called classes or bins. C. The classes in a histogram cover the complete range of observations. D. All of these choices are true.

18. Which of the following statements about shapes of histograms is true? A. A histogram is said to be symmetric if, when we draw a vertical line down the center of the histogram, the two sides are identical in shape and size. B. A negatively skewed histogram is one with a long tail extending to the left. C. A positively skewed histogram is one with a long tail extending to the right. D. All of these choices are true.

19. Observations that are measured at successive points in time is what type of data? A. Time-series data B. Cross-sectional data C. Successive data D. None of these choices.

20. Observations that are measured at the same time represent what type of data? A. Time-series data B. Cross-sectional data C. Successive data D. None of these choices.

21. The two most important characteristics revealed by the scatter diagram are the strength and direction of the linear relationship. A. True B. False

22. If the data in a scatter diagram is scattered completely at random, what do you conclude? A. There is no linear relationship between X and Y. B. There is a strong linear relationship between X and Y. C. There is a strong linear relationship between X and Y that is described by a horizontal (flat) line. D. None of these choices.

23. If two variables have a strong linear relationship, it means one variable is causing the other variable to go up or down. A. True B. False

please help me i am really desperate and confused

Answer 1

7. True.

Since only few groups are selected for sampling they require few resourses and cost less, but the samples are biased and they cause sampling error.

8. True.

The gender is qualitative, and has categories therefore it is nominal data.

9. False.

The grading is Ordinal data. The data is catagorical and can be ranked therefore it is ordinal.

10. False.

The values of quantittative data are numerical.

11. True.

Nominal data are also called qualitative ot categotical data.

12. False.

The characteristic of a populatation is called parameter and of sample it is called statistic.

13. False.

With nominal data, there is not only one way the possible values can be ordered.

14.True.

You cannot calculate and interpret differences between numbers assigned to nominal data. You can do it for ordinal data.

15. C. The number of students in your class who received an A, B, C, D, F on their exam.

16. D. All of these choices are true.

17.  D. All of these choices are true.

18. D. All of these choices are true.

19. A. Time-series data

Data that is collected at the different point in time is called time series data. Reading of the milage of a vehical years apart.

20. B. Cross-sectional data

Data that is collected at the same point in time is called cross sectional data. Such as sample of individuals, households, firms, cities, etc.,

21. A. True

The two most important characteristics revealed by the scatter diagram are the strength and direction of the linear relationship.

22. A. There is no linear relationship between X and Y.

If the data in a scatter diagram is scattered completely at random, then there is no linear relationship between X and Y.

23. A. True

Yes, if two variables are have a strong linear relationship then change in one varible will cause proportionate change in other variables as well. It is the reason we say their exists a relationship.