Transcript ch 08 learning

Classify the pair of samples as dependent
or independent.
Sample 1: Exam scores for 25 students in
Dr. Smith’s morning statistics class.
Sample 2: Exam scores for 28 students in
Dr. Smith’s afternoon statistics class.
A. Dependent
B. Independent
Classify the pair of samples as dependent
or independent.
Sample 1: Exam scores for 25 students in
Dr. Smith’s morning statistics class.
Sample 2: Exam scores for 28 students in
Dr. Smith’s afternoon statistics class.
A. Dependent
B. Independent
State the null and alternative hypotheses.
The mean cell phone bill for females (1) is
higher than the mean cell phone for males
(2).
A. H0: μ1 > μ2 Ha: μ1 ≤ μ2
B. H0: μ1 < μ2 Ha: μ1 ≥ μ2
C. H0: μ1 ≤ μ2 Ha: μ1 > μ2
D. H0: μ1 ≥ μ2 Ha: μ1 < μ2
State the null and alternative hypotheses.
The mean cell phone bill for females (1) is
higher than the mean cell phone for males
(2).
A. H0: μ1 > μ2 Ha: μ1 ≤ μ2
B. H0: μ1 < μ2 Ha: μ1 ≥ μ2
C. H0: μ1 ≤ μ2 Ha: μ1 > μ2
D. H0: μ1 ≥ μ2 Ha: μ1 < μ2
Find the standardized test statistic z for the
following situation:
Claim: μ1 = μ2; x1  81.2 s1 = 3.7 n1 = 40
x2  78.9 s2 = 2.1 n2 = 35
A. z = 3.25
B. z = 3.36
C. z = 2.45
D. z = 5.89
Find the standardized test statistic z for the
following situation:
Claim: μ1 = μ2; x1  81.2 s1 = 3.7 n1 = 40
x2  78.9 s2 = 2.1 n2 = 35
A. z = 3.25
B. z = 3.36
C. z = 2.45
D. z = 5.89
Find the pooled estimate of the standard
deviation ̂ for the following situation:
x1  6.2
x2  6.9
s1 = 1.3
s2 = 0.8
A. ˆ  1.05
B. ˆ  1.10
C. ˆ  1.01
D. ˆ  1.09
n1 = 12
n2 = 15
Find the pooled estimate of the standard
deviation ̂ for the following situation:
x1  6.2
x2  6.9
s1 = 1.3
s2 = 0.8
A. ˆ  1.05
B. ˆ  1.10
C. ˆ  1.01
D. ˆ  1.09
n1 = 12
n2 = 15
Find the standardized test statistic t for the
following situation (assume the
populations are normally distributed and
the population variances are equal):
Claim: μ1 = μ2; x1  6.2 s1 = 1.3 n1 = 12
x2  6.9 s2 = 0.8 n2 = 15
A. t = –1.72
B. t = –1.63
C. t = –0.63
D. t = –0.69
Find the standardized test statistic t for the
following situation (assume the
populations are normally distributed and
the population variances are equal):
Claim: μ1 = μ2; x1  6.2 s1 = 1.3 n1 = 12
x2  6.9 s2 = 0.8 n2 = 15
A. t = –1.72
B. t = –1.63
C. t = –0.69
D. t = –0.63
State the null and alternative hypotheses.
The mean score before and after a
treatment are the same.
Before
After
7
5
5
4
8
4
A. H0: μ1 = μ2 Ha: μ1 ≠ 0
B. H0: μ1 ≠ μ2 Ha: μ1 = μ2
C. H0: μd = 0
Ha: μd ≠ 0
D. H0: μd ≠ μ2 Ha: μd = 0
3
2
6
7
4
3
State the null and alternative hypotheses.
The mean score before and after a
treatment are the same.
Before
After
7
5
5
4
8
4
A. H0: μ1 = μ2 Ha: μ1 ≠ 0
B. H0: μ1 ≠ μ2 Ha: μ1 = μ2
C. H0: μd = 0
Ha: μd ≠ 0
D. H0: μd ≠ μ2 Ha: μd = 0
3
2
6
7
4
3
Find the mean of the difference between
the paired data entries in the dependent
samples, d.
Before
After
A. 4.17
B. 4.83
C. 1.33
D. 5.5
7
5
5
4
8
4
3
2
6
7
4
3
Find the mean of the difference between
the paired data entries in the dependent
samples, d.
Before
After
A. 4.17
B. 4.83
C. 1.33
D. 5.5
7
5
5
4
8
4
3
2
6
7
4
3