A poll was taken of 100 college freshmen to determine whether chocolate or vanilla was the preferred ice cream flavor. It was expected that 25% would prefer chocolate and 75% would prefer vanilla. Let's look at the results of the survey. Instead of 25% of the students polled preferring chocolate, it turns out that 39% preferred it, and instead of 75% of the students polled preferring vanilla, it turned out that 61% preferred it.
a. Compute for X2                                                                                                                                      
b. State and explain the conditions necessary for the application of X2