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Analysis of test scores part 2
Generated Apr 13, 2015 by shavmiller18

interesting observation steam and leaf: all the stem numbers are in pairs except for the first and last number

boxplot: majority of the test scores seem to be 87.5 which is the median and less.

yes they are correlated, because the quartile are the same.

Result 1: Stem and Leaf Plot   [Info]
Variable: test score

Decimal point is 1 digit(s) to the right of the colon.
Leaf unit = 1
 5 : 5555
 6 : 2
 6 : 55
 7 : 333
 7 : 699
 8 : 
 8 : 778888999
 9 : 33
 9 : 599
10 : 000



Result 2: Boxplot   [Info]
Right click to copy



Result 3: Regression test scores by class   [Info]
Simple linear regression results:
Dependent Variable: test scores
Independent Variable: class
test scores = 98.009259 - 6.8240741 class
Sample size: 15
R (correlation coefficient) = -0.55403449
R-sq = 0.30695422
Estimate of error standard deviation: 13.21731

Parameter estimates:
ParameterEstimateStd. Err.AlternativeDFT-StatP-value
Intercept98.0092598.1437257 ≠ 01312.034941<0.0001
Slope-6.82407412.8439124 ≠ 013-2.39953740.0321

Analysis of variance table for regression model:
SourceDFSSMSF-statP-value
Model11005.86851005.86855.75777960.0321
Error132271.0648174.69729
Total143276.9333