Problem set 2 -Micaela Martin
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BIOL 4500
–
Statistics Problem Set # 2 Name: Micaela Martin
1. Assemble an SPSS data file with this information. Now, calculate the
mean, median, variance, standard deviation, range, sample size and a 95%
confidence interval for the mean of the male data and the female data
(separately). Present these statistics here. Is the confidence interval you
generated appropriate to use? (3 pts.)
Statistics
Male size
(mm)
Female size
(mm)
N
Valid
16
16
Missing
0
0
Mean
77.3938
93.1250
Median
75.3500
92.0000
Std. Deviation
12.10683
10.41976
Range
40.00
34.70
Minimum
59.70
77.90
Maximum
99.70
112.60
-
When looking at the statistics we can say that we need to use the
2. Produce a histogram of body size for males and females (separately). (4
pts.)
3. Now produce a bar graph that shows the mean for males and females
together in the same graph. Add error bars to your bar chart under the
“options” button. Make the error
bars ± 1 standard deviation. The default is
the 95% confidence interval. DO NOT USE THE CONFIDENCE INTERVAL FOR
ERROR BARS!!! (4 pts.)
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