A research group wants to determine whether the proportion of car accidents caused by drivers using cell phones has changed from the previous value of 13%. They obtained 10,000 accident reports and found that 12% were caused by drivers using cell phones. The hypotheses are:

H_0: p= 0.13, H_a: p 0.13, where p is the proportion of accidents caused by cell phones.

Compute the value of the test statistic.

a) -4.134

b) -2.974

c) -1.011

d) -5.948