If a teacher wants to test her belief that more than 5 students in college classes typically receive A as a grade, she'll perform?
a. two tailed testing of a mean
b. two tail testing of a proportion
c. one tail testing of a proportion
d. one tail testing of a mean
I choose b..is this correct???
You are testing one tail.
The time spent (in days) waiting for a heart transplant in two states for patients with type A+ blood can be approximated by a normal distribution, as shown in the graph to the right. mean of =128 Standard deviation of=23.3
Yes, your choice of b. two tail testing of a proportion is correct.
To explain why:
In this scenario, the teacher wants to test her belief that more than 5 students in college classes typically receive A as a grade. This is a comparison of a proportion (the proportion of students receiving A) to a specific value (5 students).
Since the teacher is interested in whether the proportion is greater than the specific value (5 students), it is a one-tail test. However, it is also important to consider the possibility that the proportion could be less than the specific value. Therefore, a two-tail test is more appropriate.
Hence, the teacher would perform a two-tail test of a proportion as the correct choice.