Test yourself (Chapter 4)

Circle the best answer:
1. The probability of selecting a digit 3 from all single digits is
A. 1/10          
B. 3/10
C. 1/9.

 2. When a meteorologist says that there is a 30% chance of showers, what type of probability is the person using
A. Classical probability.           
B. Empirical probability.           
C. Subjective probability.

3. Students told Dr. Chen that “the probability of parking in the front of Collins Hall is 0%!” This is an example of
A. Classical probability.           
B. Empirical probability.           
C. Subjective probability.

4. When three coins are tossed, the sample space consists of how many possible outcomes?
A. 6.                            
B. 8.              
C. 12.                         
D. 36

5. In an experiment of rolling a die, let event A be “getting a number great than 1” and event B be “getting a number less than 1,” are A and B mutually exclusive?
A. Yes.                       
B. No.             
C. It cannot be determined.

6. In an experiment of rolling a die, let event A be “getting a number greater than 5,” what is the complement of A?
A. Getting a number less than 5.           
B. Getting a number less than or equals to 5.                                         
D. It cannot be determined.

7. When a die is rolled, what is the probability of getting a 4 or a 6?
A. 2/6                           
B. 1/3                
C. 1/6                     
D. It cannot be determined.

Answer:

1. a
2. b
3. c
4. b
5. a
6. b
7. b

Test yourself (chapter 2)

1. Name the following graphs:
(a)       (b)     (c)

(d)       (e)

2. One of the graph above is wrong. Can you tell which one?

3. What are the relationship between X and Y? Can you guess the value of the correlation coefficient r?

(f)                         (g)

Answer:

1. (a) Ogive.   (b) Pie chart   (c) Time series   (d) Pareto chart   (e) Histogram
2. (d) Pareto chart is wrong because it should be arranged in order from highest to lowest.
3. In graph (f) X and Y are perfectly linearly related. The correlation coefficient r is 1.
In graph (g) There is no clear linear relationship between X and Y. The correlation coefficient should be close to 0.