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

1. Standard deviation measures:

A) Central tendency
B) Frequency
C) Spread of data
D) Probability

2. In a city's public transportation system, the distribution of commuters by mode of transport is as follows: 40% use buses, 25% use trains, 20% use bicycles, 10% walk, and 5% use other means of transportation.
What is the probability that a randomly selected commuter uses either a bus or a train?

A) 30%
B) 65%
C) 45%
D) 50%

3. A hospital analyzes the recovery rates of patients undergoing two different treatments for a specific condition.
Treatment X has an overall recovery rate of 80%, while Treatment Y has a recovery rate of 90%. However, when the data is divided by age groups, Treatment X has a higher recovery rate in each age group compared to Treatment Y.
Is Simpson's paradox present in this study?

A) Yes, because the overall recovery rates are inconsistent with the age group-specific rates.
B) No, because the overall recovery rate is higher for Treatment Y.
C) No, because the study does not involve a confounding variable that affects recovery rates.
D) Yes, because the recovery rates differ between the two treatments.

4. Correlation r = 0.8 # strong positive relationship #

A) True
B) True only when r is negative
C) True only for categorical variables
D) False

5. Which distribution models number of successes in fixed independent trials?

A) Binomial
B) Poisson
C) Uniform
D) Normal

Solutions: