Afra has just been hired to be the new manager of a movie theatre at the mall. She wants to know whether people of different ages spend different amounts of money on snacks. So, she simply records the age and amount of money spent. She compared three groups (people under 30, people in their 30s and people over 40) and found the average amount of money spent on snacks for each group. She compared these three means. Her results are shown in this graph. This is an example of a _____. Question 1 options: a) correlation b) t-test c) one-way ANOVA d) two-way ANOVA