1. If the area of the shaded part of the t-distribution below is 0.15, what is the area of the unshaded region?
A. 0.15
B.0.75
C. 15%
D. 0.85
2. Using the t-table, if the t-value is -1.708 and the shaded region is on the left of the t-distribution, what is the area
of the unshaded region?
A. 0.05
B. 0.10
C. 0.90
D. 0.95 3.
3. Which t-distribution corresponds to t-value of 2.567 and whose shaded area on the right tail of the t-distribution
is 0.01?
A. at distribution with 7 degrees of freedom C. at distribution with 38 degrees of freedom
B. at distribution with 17 degrees of freedom D. at distribution with infinite degrees of freedom
4. Using the t table, if the t-value is 2.093 and the shaded area is on the right of the t-distribution, what are the
degrees of freedom?
A. 0.025
B. 1.9
C. 19
D. 20 5.
5. The shaded region is on the left tail of the t-distribution. If the degree of freedom is 25 and the area of the
shaded region is 0.05, what is the value of t?
A. 2.059
B. 1.708 C.1.316 D.-1.708
6. Using the t-table, find the area to the right of 1.83 under the t- distribution with 18 degrees of freedom?
A. between 0.01 to 0.02
C. between 0.025 to 0.05
B. between 0.02 to 0.025 D. between 0.05 to 0.10
7. It is the value on the t distribution whose left tail probability is 93% and whose right-tail probability is 7%.
A. left t-value B. right t-value C. 93rd percentile D. 7th percentile
9. Which of the following values is the 90th percentile of the t-distribution with 10 degrees of freedom?
A. 1.363
B. 1.372 C. 1.383
D. 1.812
10. If the degree of freedom is 24, what is the 95th percentile of the t-distribution?
A. 1.711
B. 1.714
C 1.717
D. 2.064
11. Which of the following values and percents illustrates the confidence level?
A. 32.8
B. 30-39
C. 90%
D. 90% - 94%
12. Which of the following symbols is used to get the mean?
A. E
B. u or X
C. n
D. o
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