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Confidence Intervals
Test Description: Confidence intervals for mu and p
Instructions: Answer all questions to get your test result.
1) Create a CI for mu using x bar = 10 and E = 2
A
(5, 20)
B
(2, 10)
C
(6, 14)
D
(8,12)
2) Create a CI for mu using x bar = 5.3 and E = 1.1
A
(4.2, 6.4)
B
(2.1, 8.6)
C
(3.2, 7.5)
D
(1.1, 5.3)
3) Create a CI for p using p hat = 7 and E = 0.94
A
(4, 6.94)
B
(2.75, 4.83)
C
(0.94, 7)
D
(6.06, 7.94)
4) Create a CI for p using p hat = 25 and E = 8
A
(17, 33)
B
(13, 27)
C
(15, 30)
D
(11, 24)
5) How would increasing a CL from 90% to 95% affect a CI?
A
It would not affect the CI.
B
It would decrease the margin of error resulting in a narrower interval.
C
It would increase the margin of error resulting in a wider interval.
D
not enough information
6) The z-score for a CL of 90% is
A
1.645
B
2.381
C
1.079
D
1.960
7) The z-score for a CL of 95% is
A
1.960
B
1.079
C
1.645
D
2.381
8) When the sample size n is less than 30, you can use a
A
t-distribution
B
p-distribution
C
n-distribution
D
q-distribution
9) Degrees of freedom d.f. are equal to
A
t-score t - 1
B
sample size n - 1
C
margin of error E - 1
D
z-score z - 1
10) You can get a degree of freedom at
A
a party hat store
B
a restaurant
C
law school
D
the mall
*select an answer for all questions
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