According to a University Center for Logistics Management, 7% of all merchandise sold in the United States gets returned. A Seattle department store sampled 90 items sold in January and found that 9 of the items were returned.
If you have the following null and alternative hypotheses for a test you are running:
H0:p=0.07
Ha:p≠0.07
Calculate the test statistic, rounded to 3 decimal places
z=_________________________