Question: A dental hygienist wants to evaluate the effect of a dental film on the frequency with which children brush their teeth. 30 children were randomly selected and randomly assigned to one of two conditions. One group of 15 children watched the film and the other 15 did not. The number of times the children brushed their teeth over a one month period was recorded and shown below. Can the educator conclude using alpha =.01 that the film has an effect on the frequency with which children brush their teeth. State any assumptions you must make as part of step 2. Show all 4 steps of our hypothesis testing procedure. Interpret your results as if you were addressing a group of parents.

Film No film
22 22
28 25
27 22
30 26
30 28
25 26
25 22
30 30
29 19
29 26
27 25
27 24
30 27
28 25
26 22