Question

1) Timothy has finished calculating a z-test. Now he turns to the table of z-scores to find the:

a) Critical value

b) Test value

c) calculated value

d) obtained value

2) Joyce has calculated a Z-test with an alpha set to .05. She calculates a z-value of 6.36. What can she conclude?

a) none of these

b) reject the null hypothesis

c) fail to reject the null hypothesis

d) the result is too close to call

3) In order to calculate the standard error of the mean in the one-sample z-test, you should:

a) take the square root of the sample size and divide it by the population standard deviation

b) take the population standard deviation and divide it by the square root of the sample size

c) take the population standard deviation and divide it by the size of the sample

d) take the sample standard deviation and divide it by the size of the sample

4) Calculate the z-value for a one-sample z-test given the following information:
Sample mean: 20
Population mean: 10
Standard error of the mean: 2

a) −5

b) 0

c) 50

d) 5

5) If your sample mean is 25, your population average is 5, and your standard error of the mean is 10, what is your observed z value?

a) −2

b) 2

c) 2.5

d) 5

6) Matt wants to calculate a one-sample z-test. His data has a population standard deviation of 10 and a sample size of 4. What is the standard error of the mean?  

a) 5

b) −5

c) 6

d) 14

7) Which of the following accurately describes the null hypothesis in a one-sample Z-test?

a) The mean of sample 1 is less than the mean of sample 2.

b) The mean of the sample is equal to the mean of the population.

c) The mean of the sample is not equal to the mean of the population.

d) The mean of sample 1 is equal to the mean of sample 2.

8) When you are calculating a one-sample t-test, the population’s standard deviation is ______.

a) known

b) exact

c) not sure

d) not known

9) Paul conducts a one-sample t-test and reports the following results: t = 2.72 and p<.05. What can you conclude?

a) The results are unknown.

b) The results are important.

c) The results are statistically significant.

d) There is no statistical significance in the test

10) Jenna is calculating a two-sample t-statistic. What value should she plug in for n₁?  

a) variance for Group 1

b) scores for Group 1

c) means for Group 1

d) number of participants for Group 1

11) John in conducting a two-sample t-test. In his data, Group 1 has 32 participants and Group 2 has 30 participants. What are the degrees of freedom for his test?

a) 58

b) 60

c) 62

d) 59

12) Which of the following accurately describes the null hypothesis in a two-sample t-test?

a) The mean of sample 1 is not equal to the mean of sample 2.

b) The mean of the sample is equal to the mean of the population.

c) The mean of sample 1 is greater than the mean of sample 2.

d) The mean of sample 1 is equal to the mean of sample 2.

Answer 1

Date Page w when Timothy then he turns to calculate option (a) is calculate z test to the table of Critical value right statisha t table - Tour 20.95= 1.96 zstut - 6.36 d=0.05, z = 2 1-0 1-0.05 is the critical value Here 2stat > R Critical value Henece Reject hul hypothes Option (b is right S.E of mean= 6 Population std deviation square root of sample size right Option (6) is 2= x 4 o = 20-10 52 = 10 option (d) is right

2= X-M = 25. 25-6 10 2=2 Option (6) is right S. F Cmean) = S. F (mean) = 5