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Question 1)
Frequencies
Statistics
Hours
N
Valid
53
Missing
0
Mean
4.464
Median
4.400
Mode
4.7(a)
Std. Deviation
.9305
Variance
.866
a
Multiple modes exist. The smallest value is shown
Hours
Frequency
Percent
Valid Percent
Cumulative
Percent
Valid
2.8
2
3.8
3.8
3.8
3.1
2
3.8
3.8
7.5
3.2
1
1.9
1.9
9.4
3.4
2
3.8
3.8
13.2
3.5
1
1.9
1.9
15.1
3.6
3
5.7
5.7
20.8
3.6
1
1.9
1.9
22.6
3.7
2
3.8
3.8
26.4
3.8
1
1.9
1.9
28.3
3.9
3
5.7
5.7
34.0
4.1
3
5.7
5.7
39.6
4.2
2
3.8
3.8
43.4
4.3
2
3.8
3.8
47.2
4.4
2
3.8
3.8
50.9
4.5
3
5.7
5.7
56.6
4.6
1
1.9
1.9
58.5
4.7
5
9.4
9.4
67.9
4.8
1
1.9
1.9
69.8
4.9
1
1.9
1.9
71.7
5.1
2
3.8
3.8
75.5
5.3
5
9.4
9.4
84.9
5.4
1
1.9
1.9
86.8
5.6
1
1.9
1.9
88.7
5.7
1
1.9
1.9
90.6
5.8
1
1.9
1.9
92.5
6.1
1
1.9
1.9
94.3
6.2
1
1.9
1.9
96.2
6.4
1
1.9
1.9
98.1
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1
1.9
1.9
100.0
Total
53
100.0
100.0
Hours
7.0
6.0
5.0
4.0
3.0
2.0
Frequency
8
6
4
2
0
Histogram
Mean =4.46
Std. Dev. =0.93
N =53
Report
Hours
Level
Mean
N
Std. Deviation
Variance
Exec
5.150
26
.7301
.533
Mgr
3.804
27
.5438
.296
Total
4.464
53
.9305
.866
We observed that the mean hours used on email per staff is 4.464. At least half of the
staff will use 4.464 hours.
The most number of staff will use 4.7 hours or 5.3 hours. The minimum number of hours
used are 2.8 hours and the maximum number of hours used are 6.7 hours.
The median 4.400 hours is quite near the mean 4.464 hours. This indicates the
distribution is symmetrical.
The standard deviation for hours spent on email is 0.9305. This indicates a fairly wide
variability in time used across levels. This variability is quite a bit smaller for the
executive level with difference in standard deviation of 0.2004 (0.93050.7301).
Question 2a)
TTest
OneSample Statistics
N
Mean
Std. Deviation
Std. Error
Mean
Hours
53
4.464
.9305
.1278
OneSample Test
Test Value = 0
t
df
Sig. (2tailed)
Mean
Difference
95% Confidence Interval
of the Difference
Lower
Upper
Hours
34.927
52
.000
4.4642
4.208
4.721
The confidence limits are 4.208 and 4.721. The two figures are a range of values
constructed so that the time used on email usage is likely to occur within that range at a
95% level of confidence.
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This note was uploaded on 02/12/2012 for the course PHYSICS 321 taught by Professor M during the Spring '11 term at Jordan University of Science & Tech.
 Spring '11
 M
 Physics

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