To determine if the relationship exists between blood uric acid (BUA) level and sex, the researcher screened 465 males and 656 females and classified them as to whether they had normal or elevated BUA levels. The study disclosed that 143 of the males and 133 of the females had elevated BUA. Do these findings suggest that there is a difference in the proportion of elevated BUA between males and females, with a level of significance of 0.05?

1.What is the null hypothesis?

a. The proportion of elevated BUA in males is equal to the proportion of elevated BUA in females.

b. The proportion of elevated BUA in males is not equal to the proportion of elevated BUA in females

c. The proportion of elevated BUA in males is higher than the proportion of elevated BUA in females

d. The proportion of elevated BUA in females is higher than the proportion of elevated BUA in males

2.What is the alternative hypothesis?

a. The proportion of elevated BUA in males is equal to the proportion of elevated BUA in females

b. The proportion of elevated BUA in males is not equal to the proportion of elevated BUA in females

c. The proportion of elevated BUA in males is higher than the proportion of elevated BUA in females

d. The proportion of elevated BUA in females is higher than the proportion of elevated BUA in males

3.What is the appropriate test statistic? Please provide the formula.

4.What is the region of rejection (or the critical region)?

a.z >= 1.28 and z <= -1.28

b.z >= 1.96 and z <= -1.96

c.z >= 1.64 and z <= -1.64

d.z >= 2.58 and z <= -2.58