Dr. lombardi is interested in the effect of three different computer software programs for teaching calculus. she randomly assigned 20 high school students into four groups (the fourth group was a control group that did not use any software). following the instruction phase, she administered a 100-item standardized calculus test and recorded the number of errors for each participant. the results are as follows: group 1 group 2 group 3 group 4 10 3 19 23 7 8 12 14 9 7 16 16 8 5 14 18 15 6 7 12 using all the steps in hypothesis testing, determine if there are any significant differences among the groups.
