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

1. Standard error decreases when:

A) Decreases
B) Confidence decreases
C) SD increases
D) Sample size increases

2. 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) .72
B) .76
C) .34
D) .32

3. Regression R² = 0.64. Interpretation?

A) 64% chance of prediction
B) 64% of variation in Y explained by X
C) Slope = 0.64
D) Correlation = 0.64

4. Boxplot shows:

A) Variance
B) Probability
C) Mean only
D) Median, quartiles, outliers

5. What is true about the correlation between the variables?

A) There is a strong negative correlation between the variables x and y.
B) There is a weak positive correlation between the variables x and y.
C) There is a weak negative correlation between the variables x and y.
D) There is a strong positive correlation between the variables x and y.

Solutions: