Students are asked to rate their preference for one of four video games. The following table lists the observed preferences in a sample of 120 students. State whether to reject or retain the null hypothesis for a chi-square goodness-of-fit test given the following expected frequencies.

(a) Expected frequencies: 25%, 25%, 25%, 25%, respectively
(b) Expected frequencies: 70%, 10%, 10%, 10%, respectively

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Video Bames Tic-TacSilly Super McStats Stats Stats Stats Frequency observed 30 30 30 30