The data relating to these variables for the 20 participants is as follows:
Exercise Type
running only
running only
running only
running only
combination of exercise
running only
combination of exercise
combination of exercise
combination of exercise
runn

1. Calculate data for a sixth variable, Improvement, by subtracting the value for the Pre Time
variable from the value of the Post Time variable for each participant. Then use this data to
complete the following:
[6 marks]
a. Determine the mean of the Imp

a. Which, if any, values are outliers for the
Post Time variable?
1. For the Pre Time and Post Time variables:
[6 marks]
a. Determine the standard deviation of both variables for this population, rounded to two
decimal places
b. Comment on how the dispers

Use the information provided on the previous page to complete the following tasks (show working
where you can, as in some cases this may allow you to obtain partial marks for incorrect solutions):
1. For each of the following variables, state whether the

1. Calculate data for a sixth variable, Improvement, by subtracting the value for the Pre Time
variable from the value of the Post Time variable for each participant. Then use this data to
complete the following:
[6 marks]
a. Determine the mean of the Imp

1. Display the data for the Gender variable in a column graph, and state what percentage of
participants were male
[3 marks]
2. Display the data for the Weight variable in a frequency distribution table using class intervals of
equal width (the first one

1
Calculate data for a sixth variable, Improvement, by subtracting the value for the Pre Time
variable from the value of the Post Time variable for each participant. Then use this data to
complete the following:
[6 marks]
a Determine the mean of the Impro

1. The following is a box plot for the Post Time variable, which you should use to answer the
questions below:
[4 marks]
a. What is the median of the Post Time variable?
b. What are the upper and lower quartiles and hence what is the interquartile range o

1. Calculate data for a sixth variable, Improvement, by subtracting the value for the Pre Time
variable from the value of the Post Time variable for each participant. Then use this data to
complete the following:
[6 marks]
a. Determine the mean of the Imp