Question

Gardeners on the west coast of the United States are investigating the difference in survival rates of two flowering plants in drought climates. Plant A has a survival rate of 0.74 and plant B has a survival rate of 0.48. The standard error of the difference in proportions is 0.083. What is the margin of error for a 99% confidence interval? Use critical value z = 2.576.

Answer 1

The 99% confidence interval would be given (0.004;0.436).