SRiS Ch. 6 Review

How can you tell when data is paired in an experiment?

• When each subject does both treatments
• When there are two subjects
• When there are two variables
• When there are two people in the experiment
• None of the above are correct

Which choice is the only false statement?

• In a numerical distribution, about 25% of the data values are greater than or equal to the value of the 3rd quartile
• In a boxplot, the IQR equals the length of the box
• In an experiment, control means not letting any of the subjects know what treatment they are trying
• To estimate the p-value from a dotplot, divide the total number of dots into the number of dots that are equal to or more extreme than the test statistic
• A simulation is a controllable event that has the same probability of success as an athlete’s or team’s ABILITY, and that can be repeated many times

Which choice is the only true statement?

• paired data can only result from an experiment, never from an observational study
• in a hypothesis test, the alternative hypothesis is always that there is no difference in ABILITY
• the “mean difference” from paired data is calculated the same way as the “difference in means” from unpaired data
• A Type II error occurs when the null hypothesis is rejected but it turns out to be true
• none of the above are correct

Which choice correctly completes the statement? “In experiments where each subject gets both treatments, the data are paired because ______ “

• there are two values of the test statistic for each subject
• there are two values of the response variable for each subject
• there are two values of the p-value for each subject
• there are two subjects for each treatment, one subject is blind and one subject is not blind
• none of the above are correct

Which choice correctly describes the concept of control in an experiment?

• use two subjects for each treatment, one subject is blind and one subject is not blind
• don’t let any of the subjects know that they are part of an experiment
• have the subjects do the treatments in random order
• keep every variable the same, except for the variable being investigated
• none of the above are correct

12, 9, 5, 14, 8, 10, 3, 12, 15, 18, 14, 28, 18 What is the IQR?

• 9
• 10
• 8
• 6
• none of the above are correct

12, 9, 5, 14, 8, 10, 3, 12, 15, 18, 14, 28, 18 What is the LOB?

• -3
• -6.5
• 1.5
• -3.5
• none of the above are correct

12, 9, 5, 14, 8, 10, 3, 12, 15, 18, 14, 28, 18 What is the mean?

• 12.769
• 14.231
• 14.615
• 15.308
• none of the above are correct

12, 9, 5, 14, 8, 10, 3, 12, 15, 18, 14, 28, 18 Are there any outliers?

• 28 is the only outlier
• no outliers
• both 3 and 28 are outliers
• 3 is the only outlier
• none of the above are correct

After 5 games a softball player has made 13 outs and has 3 hits. What fraction would be used to compute her batting average?

• 16/3
• 13/3
• 0.23076923076923078
• 0.1875
• none of the above are correct