Description
Who knows how to answer statistics questions using Statcrunch software ( see attached files )
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Explanation & Answer
See attached. Remember to add your name and section number
1
Data Analysis Assignment #4
Name
STAT 250_section number
1
2
Question 1
1a.
1b.
Column
n
Mean Median Std. dev.
Armspan_cm 374 167.55
167
14.07
1c..
The distribution of the data is approximately bell shaped. The data in centered around 167.55 cm. The data
is highly spread out as indicated by the standard deviation. Based on the box plot, there is presence of very
large outliers.
1d.
All the conditions are met.
The conditions are:
-The sample should be randomly picked and independent
2
3
-Sample should be large or the population should be normally distributed
-Population should be large
1e.
Confidence interval = sample mean ± t critical * s/ sqrt n
Confidence interval = 167.55 ± 1.96 * 14.07/ sqrt(374)
Confidence interval = 167.55 ± 1.43
Confidence interval = ( 166.12, 168.98)
1f.
95% confidence interval results:
Variable
Armspan_cm
Sample Mean
Std. Err.
DF
L. Limit
U. Limit
167.55481 0.72752257 ...