Analysis of the Lectura data, using Tiempo_primeralectura as the response variable and Instructor as the single grouping factor.

Prepared by BrailleR

Group summaries

Level Mean Standard deviation n Standard error
Instructor 1 88.9382 10.62567 100 1.062567
Instructor 2 86.3614 10.11707 100 1.011707
Instructor 3 89.7064 10.62257 100 1.062257
Instructor 4 88.5433 10.22326 100 1.022326

The ratio of the largest group standard deviation to the smallest is 1.05

Comparative boxplots

Comparative boxplots

 This graph has 4 boxplots printed vertically
 with the title: 
 "" appears on the x-axis.
 "" appears on the y-axis.
 Tick marks for the y-axis are at: 60, 70, 80, 90, 100, 110, and 120 
 Group Instructor 1 has 100 values.
 An outlier is marked at: 59.29 
 The whiskers extend to 61.76 and 111.71 from the ends of the box, 
 which are at 81.76 and 96.62 
 The median, 88.565 is 46 % from the lower end of the box to the upper end.
 The upper whisker is 0.75 times the length of the lower whisker.
 Group Instructor 2 has 100 values.
 An outlier is marked at: 115.49 
 The whiskers extend to 64.74 and 109.8 from the ends of the box, 
 which are at 77.775 and 92.43 
 The median, 86.73 is 61 % from the lower end of the box to the upper end.
 The upper whisker is 1.33 times the length of the lower whisker.
 Group Instructor 3 has 100 values.
 An outlier is marked at: 62.39 
 The whiskers extend to 66.78 and 116.84 from the ends of the box, 
 which are at 84.09 and 97.41 
 The median, 88.935 is 36 % from the lower end of the box to the upper end.
 The upper whisker is 1.12 times the length of the lower whisker.
 Group Instructor 4 has 100 values.
 An outlier is marked at: 119.91 
 The whiskers extend to 64.2 and 111.53 from the ends of the box, 
 which are at 82.525 and 95.3 
 The median, 88.13 is 44 % from the lower end of the box to the upper end.
 The upper whisker is 0.89 times the length of the lower whisker.

Comparative dotplots

Warning in dotplot.formula(tiempo_primeralectura ~ Instructor, xlab =
"Tiempo_primeralectura", : The dotplot command is a wrapper for stripchart, and
is not a base R function.

Comparative dotplots

This graph has 400 dotplots printed horizontally
with the title: 
"" appears on the x-axis.
"" appears on the y-axis.
Tick marks for the x-axis are at: 60, 70, 80, 90, 100, 110, and 120 
the data that range from 59.29 to 119.91 has been broken into 6 bins.
The counts are:
Instructor 1: 1 0 0 0 0 0 
Instructor 2: 1 0 0 0 0 0 
Instructor 3: 1 0 0 0 0 0 
Instructor 4: 1 0 0 0 0 0 
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One-way Analysis of Variance


The p value for Instructor is 0.1286

The ratios of the group standard deviations to the overall standard deviation 
 (groups ordered by increasing mean) are:
 1.02 0.97 1.02 0.98


             Df Sum Sq Mean Sq F value Pr(>F)
Instructor    3    617   205.7   1.902  0.129
Residuals   396  42829   108.2

Residual analysis

Tests for homogeneity of Variance


    Bartlett test of homogeneity of variances

data:  tiempo_primeralectura by Instructor
Bartlett's K-squared = 0.38638, df = 3, p-value = 0.943


    Fligner-Killeen test of homogeneity of variances

data:  tiempo_primeralectura by Instructor
Fligner-Killeen:med chi-squared = 1.3492, df = 3, p-value = 0.7175