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WGU Applied Probability and Statistics (FZO1 C955) Sample Questions:

1. A commuter has a .4 probability of taking the bus to work, a .4 probability of driving a car, and a .2 probability of cycling. The probability of being late is .15 when taking the bus, .05 when driving a car, and .1 when cycling.
What is the probability of taking the bus and being on time, or driving a car and being on time?

A) .34
B) .32
C) .72
D) .76

2. Probability of heads on 3 coin flips exactly twice?

A) 1/4
B) 1/8
C) 3/8
D) 1/2

3. Histogram vs bar chart:

A) None
B) Same
C) Histogram for numeric intervals, bar for categories
D) Bar for numeric, histogram for categories

4. Uniform distribution 0-10: P(X < 4) = ?

A) 0.25
B) 0.6
C) 0.4
D) 0.5

5. A team of scientists wants to understand the relationship between smoking and lung cancer. They collect data from 1,000 individuals, recording their smoking habits and whether they have been diagnosed with lung cancer. The scientists then analyze the data to find any correlations.
Is this study observational or experimental?

A) Observational, because the study involves a large sample size.
B) Experimental, because the researchers are testing the effects of smoking on lung cancer.
C) Experimental, because the researchers are analyzing the data to find correlations.
D) Observational, because the researchers are collecting data without manipulating any variables.

Solutions: