How would you compare percentages for this data (that relates to dolphin activity)?
First you need to determine what the explanatory and response variables are, because dolphin activity was the variable being measured in this observational study, (and time is usually explanatory as it does not depend on any other variable), 'activity' is the response variable. Therefore in order to make a comparison between the variables, we will need to compare two different times of day, on the basis of one type of activity.
I think you're confused on how to add up the percentages, and for this one you would need to add up the columns (as this is where the explanatory variables are) conveniently, the sum of each column already adds up to 100, so you will not have to do a calculation.
My answer for this question would be:
The two-way table, suggests that there is an association between the time of day, and observed dolphin activity. For example, the percentage of dolphins who spent time travelling, differed based on whether it was morning, or noon, increasing from 8% to 40%
im pretty sure this is how to answer it... (according to past VCAA questions that are simillar)