IB SEHS Topic 6

What do error bars represent?

• The value of the group mean

• A correlation between two variables

• The independent variable

• The standard deviation

In the scientific display of data what is the function of error bars?

• To show the difference between two or more means

• To show variation around the mean or mean values

• To demonstrate whether statistical tests are one tailed or two tailed

• To display the range of data

Which set of results shows the greatest variability?

• A

• B

• D

• C

What do error bars represent?

• Range

• Variability

• Coefficient

• Significance

Based upon the following set of results for a sit and reach test, what is the mean result?

Trial 1: 23 cm

Trial 2: 15 cm

Trial 3: 19 cm

• 17 cm

• 18 cm

• 19 cm

• 20 cm

What is the mean flexibility score of an athlete from 6 cm, 7 cm and 11 cm?

• 7 cm

• 8 cm

• 9 cm

• 10 cm

A hurdler performs three 100m trials as recorded below. What is the mean time achieved in seconds?

Trial 1: 14.2 s

Trial 2: 14.4 s

Trial 3: 14.9 s

• 14.4

• 14.5

• 14.6

• 14.7

An athlete scores 25.7 cm, 24.5 cm, 23.3 cm, and 26.5 cm in a vertical jump test. What is the mean score?

• 26 cm

• 27 cm

• 24 cm

• 25 cm

What percentage of data is normally distributed within +/- 2 standard deviations of the mean?

• 99%

• 95%

• 50%

• 68%

How many standard deviations fall within 68% of values for normally distributed data?

• +/- 1

• +/- 2

• +/- 3

• +/- 4