Question: Download the fluoride.sav data set and use it to answer the research question: "Is there is a change in the mean number of cavity-free children per 100 before and after the public water fluoridation project?" Use SPSS to complete the following calculations:
(1) Run a one-sample t test on DELTA.
(2) Run a paired-sample t test for the before and after mean numbers of cavity-free children to answer this research question.
(3) Calculate a 95% confidence interval for the mean change.

Note: Data Set: Fluoride.sav