Tecnologia Informatica

One-Variable Analysis - Nota
Data variable: Nota
50 values ranging from 1,0 to 5,0

The StatAdvisor
This procedure is designed to summarize a single sample of data. It will calculate various statistics and graphs. Also included in the procedure are confidence intervals and hypothesis tests. Use the Tabular Options and Graphical Options buttons on the analysis toolbar to access thesedifferent procedures.

Summary Statistics for Nota
Count|50|
Average|4,136|
Median|4,3|
Standard deviation|0,728924|
Range|4,0|
Lower quartile|3,8|
Upper quartile|4,5|
Kurtosis|6,33095|

The StatAdvisor
This table shows summary statistics for Nota. It includes measures of central tendency, measures of variability, and measures of shape. Of particular interest here are the standardizedskewness and standardized kurtosis, which can be used to determine whether the sample comes from a normal distribution. Values of these statistics outside the range of -2 to +2 indicate significant departures from normality, which would tend to invalidate any statistical test regarding the standard deviation. In this case, the standardized skewness value is not within the range expected for datafrom a normal distribution. The standardized kurtosis value is not within the range expected for data from a normal distribution.

Percentiles for Nota
|Percentiles|
1,0%|1,0|
5,0%|2,5|
10,0%|3,5|
25,0%|3,8|
50,0%|4,3|
75,0%|4,5|
90,0%|4,95|
95,0%|5,0|
99,0%|5,0|

The StatAdvisor
This pane shows sample percentiles for Nota. The percentiles are values below which specificpercentages of the data are found. You can see the percentiles graphically by selecting Quantile Plot from the list of Graphical Options.

Frequency Tabulation for Nota
|Lower|Upper|||Relative|Cumulative|Cum. Rel.|
Class|Limit|Limit|Midpoint|Frequency|Frequency|Frequency|Frequency|
|at or below|0,0||0|0,0000|0|0,0000|
1|0,0|0,857143|0,428571|0|0,0000|0|0,0000|2|0,857143|1,71429|1,28571|1|0,0200|1|0,0200|
3|1,71429|2,57143|2,14286|2|0,0400|3|0,0600|
4|2,57143|3,42857|3,0|1|0,0200|4|0,0800|
5|3,42857|4,28571|3,85714|17|0,3400|21|0,4200|
6|4,28571|5,14286|4,71429|29|0,5800|50|1,0000|
7|5,14286|6,0|5,57143|0|0,0000|50|1,0000|
|above|6,0||0|0,0000|50|1,0000|
Mean = 4,136 Standard deviation = 0,728924

The StatAdvisor
This option performs a frequency tabulation by dividing the rangeof Nota into equal width intervals and counting the number of data values in each interval. The frequencies show the number of data values in each interval, while the relative frequencies show the proportions in each interval. You can change the definition of the intervals by pressing the alternate mouse button and selecting Pane Options. You can see the results of the tabulation graphically byselecting Frequency Histogram from the list of Graphical Options.

Frequency Tabulation for Nota
|Lower|Upper|||Relative|Cumulative|Cum. Rel.|
Class|Limit|Limit|Midpoint|Frequency|Frequency|Frequency|Frequency|
|at or below|0,0||0|0,0000|0|0,0000|
1|0,0|0,857143|0,428571|0|0,0000|0|0,0000|
2|0,857143|1,71429|1,28571|1|0,0200|1|0,0200|
3|1,71429|2,57143|2,14286|2|0,0400|3|0,0600|4|2,57143|3,42857|3,0|1|0,0200|4|0,0800|
5|3,42857|4,28571|3,85714|17|0,3400|21|0,4200|
6|4,28571|5,14286|4,71429|29|0,5800|50|1,0000|
7|5,14286|6,0|5,57143|0|0,0000|50|1,0000|
|above|6,0||0|0,0000|50|1,0000|
Mean = 4,136 Standard deviation = 0,728924

The StatAdvisor
This option performs a frequency tabulation by dividing the range of Nota into equal width intervals and counting the number ofdata values in each interval. The frequencies show the number of data values in each interval, while the relative frequencies show the proportions in each interval. You can change the definition of the intervals by pressing the alternate mouse button and selecting Pane Options. You can see the results of the tabulation graphically by selecting Frequency Histogram from the list of Graphical...