Descriptive Statistics for the Number of Chocolate Bars Consumed By 16-Year Old Girls in a Month
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chocolatefrequencies.docxRunning head: DESCRIPTIVE STATISTICS FOR THE NUMBER OF CHOCOLATE BARS 1
DESCRIPTIVE STATISTICS FOR THE NUMBER OF CHOCOLATE BARS 2
Descriptive Statistics for the Number of Chocolate Bars
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Descriptive Statistics for the Number of Chocolate Bars Consumed By 16-Year Old Girls in a Month
1. Identify the level of measurement used in this study.
The number of chocolate bars consumed by 16-year old girls on any given day of the month is a scale variable.
2. Create a frequency table with six classes.
Table 1 Group frequencies of chocolate bars consumed in a given day
|
Group frequency |
|||||
|
|
Frequency |
Percent |
Valid Percent |
Cumulative Percent |
|
|
Valid |
less than 20 |
6 |
20.0 |
20.0 |
20.0 |
|
|
21 to 30 |
5 |
16.7 |
16.7 |
36.7 |
|
|
31 to 40 |
4 |
13.3 |
13.3 |
50.0 |
|
|
41 to 50 |
3 |
10.0 |
10.0 |
60.0 |
|
|
51 to 60 |
8 |
26.7 |
26.7 |
86.7 |
|
|
more than 60 |
4 |
13.3 |
13.3 |
100.0 |
|
|
Total |
30 |
100.0 |
100.0 |
|
3. Create a histogram based on the Frequency table in problem 2.
Figure 1Histogram of the bars of chocolate consumed by 16-year old girls
4. Find the mean, median, and mode of the number of chocolate bars consumed by 16-year-old girls in a month.
Table 2 mean, median and mode for the number of chocolate bars consumed by 16-year old girls in a month
|
Statistics |
||
|
Number of chocolate bars |
||
|
N |
Valid |
30 |
|
|
Missing |
0 |
|
Mean |
15.50 |
|
|
Median |
15.50 |
|
|
Mode |
1a |
|
|
a. Multiple modes exist. The smallest value is shown |
Mean: 15.5
Median: 15.5
Mode: 1
5. Find the variance and standard deviation of the number of chocolate bars consumed by 16-year-old girls in a month.
Table 3 Standard Deviation and variance of the number of chocolate bars consumed by 16-year old girls in a month
|
Statistics |
||
|
Number of chocolate bars |
||
|
N |
Valid |
30 |
|
|
Missing |
0 |
|
Std. Deviation |
8.803 |
|
|
Variance |
77.500 |
Standard deviation: 8.803
Variance: 77.500
