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

1. A child's parents want to analyze the relationship between the daily high temperature and ice cream sales at their child's ice cream stand. They create the following scatterplot.

What is the estimated value of r, the correlation coefficient, between these variables?

A) 0.39
B) #0.93
C) #0.39
D) 0.93

2. A road safety research group wants to enhance road safety by analyzing the stopping distance of a car at different speeds. The group has recorded their data in the following scatterplot.

What is true about the outlier in the scatterplot?

A) The stopping distance of a car traveling at 40 mph is 560 feet.
B) The stopping distance of a car traveling at 10 mph is 20 feet.
C) The stopping distance of a car traveling at 30 mph is 190 feet.
D) The stopping distance of a car traveling at 60 mph is 500 feet.

3. 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) Observational, because the researchers are collecting data without manipulating any variables.
C) Experimental, because the researchers are analyzing the data to find correlations.
D) Experimental, because the researchers are testing the effects of smoking on lung cancer.

4. Sample mean = best point estimate of population mean?

A) Only for categorical data
B) Only when the sample size is 1
C) True
D) False

5. Standard deviation squared = ?

A) Mean
B) Median
C) Standard error
D) Variance

Solutions: