A professor has been teaching statistics for many years
Question # 00140284
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Updated on: 11/25/2015 10:24 AM Due on: 12/25/2015
PSY 305 Assignment 1
1. A professor has been teaching statistics for many years. His records show that the
overall mean for final exam scores is 85 with a standard deviation of 10. He believes that
this year’s class is superb to the previous classes. The mean for the 40 students is 90.
a.
b.
c.
d.
e.
f.
g.
What is the null hypothesis?
What is the research hypothesis?
Is this a one or two tailed hypothesis?
Which test should you use? Why?
Calculate the appropriate statistical test.
What is the critical value for α = .05?
What do you conclude?
2. A researcher gives a group of participants (n = 15) a memory technique to use. He
finds that they remember on average 20 words (sample standard deviation = 3) while the
average number of words remembered in the population is 15.
a.
b.
c.
d.
e.
f.
g.
What is the null hypothesis?
What is the research hypothesis?
Is this a one or two tailed hypothesis?
Which test should you use? Why?
Calculate the appropriate statistical test.
What is the critical value for α = .05?
What do you conclude?
3. What is the difference between a z-test and a t-test (i.e., when would you use each
one)?
1. A professor has been teaching statistics for many years. His records show that the
overall mean for final exam scores is 85 with a standard deviation of 10. He believes that
this year’s class is superb to the previous classes. The mean for the 40 students is 90.
a.
b.
c.
d.
e.
f.
g.
What is the null hypothesis?
What is the research hypothesis?
Is this a one or two tailed hypothesis?
Which test should you use? Why?
Calculate the appropriate statistical test.
What is the critical value for α = .05?
What do you conclude?
2. A researcher gives a group of participants (n = 15) a memory technique to use. He
finds that they remember on average 20 words (sample standard deviation = 3) while the
average number of words remembered in the population is 15.
a.
b.
c.
d.
e.
f.
g.
What is the null hypothesis?
What is the research hypothesis?
Is this a one or two tailed hypothesis?
Which test should you use? Why?
Calculate the appropriate statistical test.
What is the critical value for α = .05?
What do you conclude?
3. What is the difference between a z-test and a t-test (i.e., when would you use each
one)?
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Solution: A professor has been teaching statistics for many years