1. A researcher obtains t = 2.25 for a repeatedmeasures study using a sample of n = 10 participants. Based on this t value, what is the correct decision for a twotailed test?
a. 
Reject the null hypothesis with α = .05 but not with α = .01 

b. 
Reject the null hypothesis with both α = .05 and α = .01 

c. 
Fail to reject the null hypothesis with both α = .05 and α = .01 

d. 
Cannot make a decision without additional information 
2. Compute the Pearson correlation ( r ) for the following
data.
X 2 3 6 4
Y 3 1 5 4
a. SSX = 15, SSY = 15, SP = 10, r = 0.400
b. SSX = 10, SSY = 10, SP = 5, r = 0.500
c. SSX = 20, SSY = 20, SP = 5, r = 0.800
d. Need more information
3. A researcher obtains t = 2.25 for a repeatedmeasures study
using a sample of n = 10 participants. Based on this t value, what
is the correct decision for a twotailed test?
a. Reject the null hypothesis with α = .05 but not with α =
.01
b. Reject the null hypothesis with both α = .05 and α = .01
c. Fail to reject the null hypothesis with both α = .05 and α =
.01
d. Cannot make a decision without additional information
4. What value is estimated with a confidence interval using the
t statistic?
a. 
The value for an unknown sample mean 

b. 
The value for an unknown population mean 

c. 
The difference between two population means 

d. 
The difference between two sample means 
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