A hospital reported that the normal death rate for patients with extensive burns (more than 40% of skin area) has been significantly reduced by the use of new fluid plasma compresses. Before the new treatment, the mortality rate for extensive burn patients was about 60%. Using the new compresses, the hospital found that only42of91patients with extensive burns died. Use a 1% level of significance to test the claim that the mortality rate has dropped.

What is the value of the sample test statistic? (Round your answer to two decimal places.)