A study of helmet users and non-users injured in bicycle crashes yielded the randomly selected sample data summarized in the output provided below. Using a 0.05 significance level, test the claim that helmet use is associated with the occurrence of facial injuries resulting from bicycle accidents.

What is the expected frequency for non-helmet users who receive facial injuries?

What is the contribution to the overall test statistic of the cell corresponding to non-helmet users who did not receive a facial injury (i.e., what is the value of B in the SAS output)?