Multiple choice

1. The main purpose of descriptive statistics is to

2. The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called

3. The performance of personal and business investment is measured as a percentage, return on investment. What type of variable is return on investment?

4. What type of variable is the number of robberies reported in your city?

5. What level of measurement is the number of auto accidents reported in a given month?

6. The name of the positions in a corporation, such as chief operating officer or controller, are example of what level of measurement?

7. Shoe sizes, such as 7B,10D, and 12EEE, are example of what level of measurement?

8. Monthly commissions of first-year insurance brokers are $1,270,$1,310,$1,680,$1,410,$1,570,$1,180 and $1,420. These figures are referred to as

9. A small sample of computer operators shows monthly incomes of $1,950,$1,775,$2,060,$1,840,$1,795,$1,890,$1,925 and $1,810. What are these ungrouped numbers called?

10. The sum of the deviations of each data value from this measure of central locations will always be 0.

11. For any data set, which measures of central location have only one value?

12. A sample of single person receiving social security payment revealed these monthly benefits: $826, $699, $1,087, $880, $839, and $965. How many observations are below the median?

13. A dot plot shows

14. The test scores for a class of 147 students are computed. What is the test location of the test score associated with the third quartile?

15. The National Center for Health Statistics reported that of every 883 deaths in recent years, 24 resulted from an automobile accident, 182 from cancer, and 333 from heart disease. Using the relative frequency approach, what is the probability that a particular death is due to an automobile accident?

16. If two events A and B are mutually exclusive, what does the special rule of addition state?

17. A listing of all possible out comes of an experiment and their corresponding probability occurrence is called a

18. The shape of any uniform probability distribution is

19. The mean of any uniform probability distribution is

20. For the normal distribution, the mean plus and minus 1.96 standard deviations will include about what percent of the observations?

21. For a standard normal distribution, what is the probability that z is greater than 1.75?

22. A null hypothesis makes a claim about a

23. What is the level of signification?

24. Suppose we test the difference between two proportions at the 0.05 level of significance. If the computed z is 1.07, what is our decision?

25. Which of the following conditions must be met to conduct a test for the difference in two sample means?

26. For a hypothesis test comparing two population means, the combined degrees of freedom are 24. Which of the following statement about the two sample sizes is NOT true? Assume the population standard deviations are equal.

27. What is the chart called when the paired data (the dependent and independent variables) are plotted?

28. What is the variable used to predict the value of another called?

29. Twenty randomly selected statistics student were given 15 multiple-choice questions and 15 open-ended questions, all on the same material. The professor was interested n determining on which type of questions the student scored higher. This experiment is an example of

30. The measurement of which weight of 100 units of a product manufactured by two parallel processes have same mean but the standard of process A is 15while that of B is 7. what can you conclude?