T OR F

1. Probability is used as the basis for inferential statistics, *

* True * False

2. The lengths of the mountains in the states of Alaska are an example of a variable * * True * False

3.The boundary of a value such as 6 inches would be 5.9-6.1 inches. *

* True * False * 4. In construction of a frequency polygon, the class limits are used for the x-axis. *

* True * False * 5. Histogram can be drawn by using the vertical and horizontal bars *

* True * False

6. in the construction of frequency distribution it is good idea to have overlapping class limits, such as 10-20, 20-30, 30-40. *

* True * False

7. The lowest level of measurement is the nominal level. *

* True * False

8. Frequency distribution can aid the researcher in drawing charts and graphs *

* True * False

9. The type of graph used to represent data is determined by the type of data collected and by the researcher's purpose. *

* True * False

10. Data collected over the period of time can be graph using a pie graph. *

* True * False

Choose the correct letter

11. What is the another name of the ogive? *

a. Histogram b. Frequency polygon c. Cumulative frequency graph d. Pareto chart

12. If the mean of the value is 64, find the sum of the value. a. 310 b. 320 c.330 d. 340

13. If the mean of the value is 8.2 and four of the values are 6,10,7, and 12, find the fifth value. *

a. 6 b. 8 c.7 d.11

15. A sales person drives 50 miles to West Chester at 40 miles/hr., and returns driving 25 miles/hr. Find the average miles per hour. *

a. 27.77mph b. 28.77 mph c. 29,77 mph d. 30.77 mph

16. For these situation, state which measure of central tendency should be used No. 16 and 17. The most typical case is desired. *

a. Mean b. Median c. Mode

17. 16. For these situation, state which measure of central tendency should be used No. 16 and 17. The distribution is open-ended. *

a. Mean b. Median c. Mode

18. Except for rounding errors, relative frequencies should add up to what sum? *

a. 0 b. 1 c 50 d. 100

19. The three type of frequency distribution are _______, ________,and ________ *

20. In a frequency distribution, the number of classes should be between _____and____ *

21. Tell whether descriptive or inferential statistics have been used. a) By 2040 at least 3.5 billion people will run short of water *

a. Descriptive Statistics b. Inferential Statistics

22. Classify the given statement as random, systematic, stratified, or cluster. a) in a large school district, all teachers from two buildings are interviewed to determine whether they believe the students have less homework to do now than in previous year. *

a. Random b. Systematic c. Stratified d. Cluster

23. A study that involves no researcher intervention is called * a. An experimental study b. A noninvolvement study c. An observational study d. A quasi-experimental study

24. A variables that interferes with other variables in the study is called *

a . A confounding variable b. An explanatory variable c. An outcome variable d. An interfering variable

25. The number of ads on a one-hour television show is what type of data? *

a . Nominal b. Qualitative c.Discrete d. Continuous

26. What is the median of a given distribution: 8, 3, 1, 4, an 7 * a. 1 b.3 c.4 d. 7