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Probability Topics: Review Questions

Module by: Roberta Bloom. E-mail the author

Based on: Probability Topics: Review by Susan Dean, Barbara Illowsky, Ph.D.

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Summary: Copy of Review Questions module m16842 (http://cnx.org/content/ m16842/) from Collaborative Statistics by Dean and Illowsky http://cnx.org/content/col10522/ , 12/18/2008 . The FORMAT only of the question numbering has been changed.

The first six exercises refer to the following study: In a survey of 100 stocks on NASDAQ, the average percent increase for the past year was 9% for NASDAQ stocks. Answer the following:

Exercise 1: REVIEW QUESTION 1

The “average increase” for all NASDAQ stocks is the:

  • A. Population
  • B. Statistic
  • C. Parameter
  • D. Sample
  • E. Variable

Solution

REVIEW QUESTION 1 Solution: C. Parameter

Exercise 2: REVIEW QUESTION 2

All of the NASDAQ stocks are the:

  • A. Population
  • B. Statistic
  • C. Parameter
  • D. Sample
  • E. Variable

Solution

REVIEW QUESTION 2 Solution : A. Population

Exercise 3: REVIEW QUESTION 3

9% is the:

  • A. Population
  • B. Statistic
  • C. Parameter
  • D. Sample
  • E. Variable

Solution

REVIEW QUESTION 3 Solution : B. Statistic

Exercise 4: REVIEW QUESTION 4

The 100 NASDAQ stocks in the survey are the:

  • A. Population
  • B. Statistic
  • C. Parameter
  • D. Sample
  • E. Variable

Solution

REVIEW QUESTION 4 Solution : D. Sample

Exercise 5: REVIEW QUESTION 5

The percent increase for one stock in the survey is the:

  • A. Population
  • B. Statistic
  • C. Parameter
  • D. Sample
  • E. Variable

Solution

REVIEW QUESTION 5 Solution : E. Variable

Exercise 6: REVIEW QUESTION 6

Would the data collected be qualitative, quantitative – discrete, or quantitative – continuous?

Solution

REVIEW QUESTION 6 Solution: quantitative - continuous

The next two questions refer to the following study: Thirty people spent two weeks around Mardi Gras in New Orleans. Their two-week weight gain is below. (Note: a loss is shown by a negative weight gain.)

Table 1
Weight Gain Frequency
-2 3
-1 5
0 2
1 4
4 13
6 2
11 1

Exercise 7: REVIEW QUESTION 7

Calculate the following values:

  • a. The average weight gain for the two weeks
  • b. The standard deviation
  • c. The first, second, and third quartiles

Solution

REVIEW QUESTION 7 Solution

  • a. 2.27
  • b. 3.04
  • c. -1, 4, 4

Exercise 8: REVIEW QUESTION 8

Construct a histogram and a boxplot of the data.

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