**1. A random sample is one ______**

** **

a. That is haphazard

b. That is unplanned

c. In which every unit of a particular size has an equal probability of being selected

d. That ensures that there will be no uncertainty in the conclusions

**2. The following distribution has:**

a. A positive skew

b. A left skew

c. No skew

d. A negative skew

**3. In an experiment on the effect of exercise on memory, the independent variable is: _____(choose only one answer)**

a. Number of hours of exercise

b. Recall score on a memory test

c. Gender of the subjects

d. Gender of the experimenter

**4. For the scores 3, 5, 8, 10, 14, 17, 21, 25, calculate the 75th percentile using the following formula: R = P/100 x (N + 1)**

a. 6.75

b. 17

c. 21

d. 20

**5. For the following data COMPUTE THE (ƩX) ^{2} AND THE ƩY^{2}**

X |
Y |

1 |
3 |

2 |
2 |

4 |
7 |

a. 21AND 62

b. 49 AND 144

c. 49AND 62

d. 21 AND 144

**6. How many 78s are there in the dataset is (multiply stems by 10.0):**

a. 0

b. 1

c. 3

d. 7

**7. Stem and leaf displays are NOT good for comparing two groups.**

a. True

b. False

**8. Although bar charts are often used to show means, what is typically a better displ**ay

a. Stem and leaf plots

b. Box plots

c. Histograms

d. Frequency tables

**9. Based on the frequency polygon of test scores displayed below, _____.**

a. Nobody scored below a 55

b. Nobody scored a 0

c. The most common score was a 75

d. Everyone got a perfect score

**10. Response times were generally shorter to the:**

a. Large target

b. Small target

**11. This bar chart shows percent increase in consumer price index for four, three-month periods ending the date shown, In which quarter did the CPI increase SECOND-MOST?**

** **

a. the quarter ending July 2000

b. the quarter ending October 2000

c. the quarter ending January 2001

d. the quarter endinig April 2001

**12. For the following histogram of test scores,the majority of test scores came between:**

a. 39.5 and 49.5

b. 89.5 and 99.5

c. 79.5 and 89.5

d. 159.5 and 169.5

**13. For the following line graph of quarterly percentage changes in five components of the CPI, which component steadily increased from quarter to quarter?**

a. Housing

b. Medical Care

c. Food and Beverage

d. Recreation

e. Transportation

**14. For the following stem and leaf plot, how many numbers are there between -2 and -1?**

4|33

3|56

2|00456

1|00134

0|1245589

-0|0679

-1|005559

-2|7

a. 0

b. 1

c. 5

d. 7

**15. For the following box plot, F represents:**

a. The mode

b. The mean

c. The median

d. A far out value

**16. A researcher collected BMI (Body Mass Index) of 10 students trained to become dietitians. The BMI for the ten students are: 18.4, 19.0, 21.4, 25.0, 23.5, 48.6, 23.6, 24.0, 18.1, 26.0**

**The researcher wants to know the MEAN AND THE MEDIAN BMI score (CALCULATE 2 NUMBERS):**

** **

**17. (SAME DATA SET) The researcher wants to know the MINIMUM, MAXIMUM AND RANGE of BMI scores (DETERMINE 3 NUMBERS)**:

**18. (SAME DATA SET) The researcher wants to know the VARIANCE AND STANDARD DEVIATION of BMI scores (CALCULATE 2 NUMBERS):**

**19. (SAME DATA SET) The researcher wants to know the interquartile range of BMI scores:**** (hint: ****25% of the BMI scores is 19****)****(CALCULATE 1 NUMBER)**

**20. (SAME DATA SET) The researcher wants to know the OUTLIER of the BMI scores****(DETERMINE 1 NUMBER)**

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