Fill the blanks in the statement below by choosing from the following options. You may use these more than once. Options: range, wider, standard deviation, average, mean. You are measuring the concentration of stress hormone cortisol in saliva samples from volunteers. As a measure of how closely the data are grouped around the mean, you might simply state the highest and lowest measurements - i.e. the of the data - but this is not ideal because the more measurements you take, the the becomes, so it is better to describe this using the