The mean or average for all the worksites within Sun Coast is 124.83dB. The median or
middle number for all noise levels is 125.72dB and the most common level of noise is 127.31dB.
UNIT VII SCHOLARLY ACTIVITY
26
Evaluation.
There are many variables that determine how much dB an employee will be exposed to in
the workplace. These variables can change at anytime and so could the location of the employee.
In my opinion, the assumption for parametric statistical data cannot be met because of these
many variables. However, if the mean is used for all workplaces, then it can be assumed that all
employees will need the best hearing protection as it is over the 120dB range.
Independent Samples
t
Test: Descriptive Statistics and Assumption
Testing
Frequency distribution table.
Group
A
Frequency
Group B
Frequenc
y
45-55
9
65-75
2
56-65
14
76-85
33
66-75
19
86-95
25
76-85
14
96-105
2
86-95
6
More
0
More
0
Histogram.
45-55
56-65
66-75
76-85
86-95
More
0
5
10
15
20
Histogram Group A
Prior Test Scores
Frequency
UNIT VII SCHOLARLY ACTIVITY
27
65-75
76-85
86-95
96-105
More
0
5
10
15
20
25
30
35
Histogram Group B
Revised Test Scores
Frequency
Descriptive statistics table.
Group A Prior Training Scores
Group B Revised Training Scores
Mean
69.79032258
Mean
84.77419355
Standard Error
1.402788093
Standard Error
0.659478888
Median
70
Median
85
Mode
80
Mode
85
Standard Deviation
11.04556449
Standard Deviation
5.192741955
Sample Variance
122.004495
Sample Variance
26.96456901
Kurtosis
-0.77667598
Kurtosis
-0.352537913
Skewness
-
0.086798138
Skewness
0.144084526
Range
41
Range
22
Minimum
50
Minimum
75
Maximum
91
Maximum
97
Sum
4327
Sum
5256
Count
62
Count
62
Measurement scale.
In my opinion, the measurement scale to use to compare training scores between an
updated training course and an original training course would be interval. This method allows
data to be compared to show an improvement or deficit in the new training program.
Measure of central tendency.
The average or mean of the test scores shows an improvement in the new training
program. The mean for the original test score was a score of 69 while the mean for the new
training was an 84. The median score for the original training program was a 75 while median
UNIT VII SCHOLARLY ACTIVITY
28
score for the new training was an 85. The most common score for the original training was an 80
while the new training was an 85.
Evaluation.
According to the descriptive statistics above, it can be assumed that the new training
program is more effective than the original training program if you are looking at it from a
statistical standpoint. In my opinion, the assumptions for parametric statistical testing were met
because the trends do show better test scores with a newer training session with the data
provided.
Dependent Samples (Paired-Samples)
t
Test: Descriptive Statistics and
Assumption Testing
Frequency distribution table.
Pre-
Exposure
Frequenc
y
Post-Exposure
Frequency
6-15
5
6-15
5
16-25
8
16-25
8
26-35
12
26-35
11
36-45
16
36-45
17
46-55
7
46-55
7
56-65
1
56-65
1
More
0
More
0
Histogram.
