An athlete completed five timed trials of a 20 m sprint test. What is the mean?

• 3.90s

• 3.95s

• 4.00s

• 4.05s

What does a large standard deviation indicate?

• The data is clustered closely to the mean.

• The data is spread widely around the mean.

• The data is normally distrubuted.

• The data is not normally distributed.

What does standard deviation represent?

• Deviation of negative values from a mean.

• Deviation of positive values from a mean.

• Spread of the variability of data around a mean.

• Statistical significance of variation around a mean.

What describes the difference between the two sets of group data in the table?

• A

• B

• C

• D

What can be represented by error bars on graphs?

• Reliability of data

• One standard deviation of data

• Percent change of data

• Validity of data

What is coefficient of variation?

• The ratio of the standard deviation to the mean expressed as a percent.

• The sum of the standard deviation and the mean.

• The ratio of the mean to the standard deviation expressed as a percentage.

• The sum of the standard deviation subtracted from the mean.

What can be represented by error bars on a graph?

• Ratio of the standard deviation to the mean value of a set of data.

• Variability of a set of data from the median.

• Variability of the mode value of a set of data.

• Variability of a set of data from the mean.

What do small standard deviation error bars show?

• A

• B

• C

• D

What percentage of the normal distribution lies within +/- 1 standard deviation of the mean?

• 98%

• 65%

• 95%

• 68%

Which is the equation for coefficient of variation?

• Coefficient of variation = standard deviation − mean

• Coefficient of variation = standard deviation ÷ mean × 100 %

• Coefficient of variation = mean − standard deviation

• Coefficient of variation = mean ÷ standard deviation × 100 %