Question

Qa. Which statement is correct?

Multiple Choice

Web searches (e.g., Google) often yield unverifiable data.

Analysts rarely consult business periodicals (e.g., Bloomberg Businessweek).

Private statistical databases (e.g., CRSP) are usually free.

Government data sources (e.g., www.bls.gov) are often costly.

Qb. Heights of male students in a certain statistics class range from Xmin = 61 to Xmax = 79. Applying the Empirical Rule, a reasonable estimate of σ would be:

Multiple Choice

3.50

2.75

3.25

3.00

Qc. A large number of applicants for admission to graduate study in business are given an aptitude test. Scores are normally distributed with a mean of 460 and standard deviation of 80. What fraction of applicants would you expect to have scores of 600 or above?

Multiple Choice

0.5401

0.0401

0.0852

0.4599

Answer 1

(Qa)

Correct option:

Web searches (e.g., Google) often yield unverifiable data.

(Qb)

Correct option:

3.50

Explanation:
Range = Maximum - Minimum = 79 - 61 = 18

So,

Applying Empirical Rule:

= 18/4 = 3.5

(Qc)

Correct option:

0.0401

Explanation:

= 460

= 80

To find P(X>600):

Z = (600 - 460)/80

= 1.75

Table gives area = 0.4599

So,

P(X>600) = 0.5 - 0.4599 = 0.0401