Free WGU Applied-Probability-and-Statistics Exam Dumps Questions & Answers

Sample mean = best point estimate of population mean?

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

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

Confidence interval = sample mean ± ?

• A.Median
• B.Critical value × SE
• C.Variance × n
• D.SD only

Correlation coefficient r = #0.5 #

• A.Weak positive
• B.Strong positive
• C.No relationship
• D.Moderate negative linear relationship

A researcher has collected information on students from a school. The researcher wants to display the ethnic groups represented in the school.
Which pair of graphs both display data in this manner?

• A.Bar graph and histogram
• B.Line graph and bar graph
• C.Pie chart and box plot
• D.Bar graph and pie chart