Typical methods of recruiting new cashiers and clerks are newspaper advertisements, notices in the store, and employee referrals. A recent study of new employees at one grocery chain had supervisors classify new recruits as "successful" and "unsuccessful". A summary of the number of "successful" and "unsuccessful" recruits by source is given below.

That all 542 employees were screened through interviews and subsequently hired. The "successful/unsuccessful" assessment was made after a 3-month probationary period.
a) Is there evidence to suggest that some methods of recruitment are better than others? Use the classical approach at a significance level of 5%.
b) Is there evidence to suggest there is a difference in the proportion of "successful" and "unsuccessful" recruits hired through "In store notice". Use the p-value approach at a significance level of 1%

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Successful Unsuccessful Newspaper ad In store notice Employee referral 54 112 126 36 90 124