Question

Pick one

*Dr. Keke examined if students would study better while listening to classical music. She
conducted that classical music makes a difference in the study habits among students, bit it
actually did not. This is an example of
Critical Region
Type I
Type II
Beta
*A class consist of 10 history and 30 math student. A random sample of n = 4 students is
selected. If the first three students are math students, what is the probability that the fourth
student is a history student
10/40
10/37
7/37
10/36
*If an entire population with u= 60 and o = 8 is transformed into z-scores, then the distribution of
z-scores will have a mean of ___ and a standard deviate of ___
0;8
60;1
60;8 (unchanged)
0;1
*It is known that the average halfwayterm sore among NYC student who take math class is u=73 A
researcher want to test the effect of a new learning website for NYC students. A sample of 50
math students at NYC was selected and used the website for one semester. What is expected if
the new website has an effect on the halfwayterm score?
-The sample mean after the treatment should be close 73 and should lead you to fail to reject the
null hypothesis.
-The sample mean after the treatment should be very different from 73 and should lead you to
reject the null hypothesis
-The sample mean after the treatment should be very different form 73 and should lead you to
fail to reject the null hypothesis
-The sample mean after the treatment should be close to 73 and should lead you to reject the
null hypothesis.
*What Z-score value separates the highest (top) 40percent of the exam scores in a normal
distribution form the lowest 60 percent?
1.28
0.25
-1.28
-0.25

Answer 1

1) Option - B) Type I

Because Type I error is the probability of rejecting the true null hypothesis.

2) Option - B) Probability = 10/37

3) The distribution of z-scores will have a mean of 60 and a standard deviation of 8.

Option - C) 60;8 (unchanged)

4) Option - B) The sample mean after the treatment should be very different from 73 and should lead you to reject the null hypothesis.

5) P(Z > z) = 0.4

or, 1 - P(Z < z) = 0.4

or, P(Z < z) = 0.6

or, z = 0.25

Option - B) 0.25