Online Access Free Applied-Probability-and-Statistics Exam Questions

Standard deviation increases #

• A.Data closer
• B.Variance decreases
• C.Data more spread out
• D.Mean increases

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

A university surveys faculty and students to determine support for a new campus recycling initiative.
The results of the survey are shown in the following 2 × 2 contingency table:

Which statement is true?

• A.Faculty members are much less likely than students to support the recycling initiative.
• B.Faculty members are slightly less likely than students to support the recycling initiative.
• C.Faculty members are much more likely than students to support the recycling initiative.
• D.Faculty members are slightly more likely than students to support the recycling initiative.

The dot plot illustrates the frequency of outdoor games played by students per week.

Which statement is true?

• A.The mean and median cannot be compared.
• B.The mean is almost the same as the median.
• C.The mean is significantly bigger than the median.
• D.The mean is significantly smaller than the median.

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