Medidas descriptivas

Statistics



	Introduction Central Tendency Measures Mean Geometric Mean Media Armónica Mediana Moda Measures of Location Centiles Deciles Cuartiles Ejercicio Measures of Position Introducción Rango Desviación media Varianza Desviación típica Coeficiente de variación Ejercicio Medidas de Forma Asimetría Apuntamiento Test

Which of the following is NOT a measure of central tendency?
1. Median
2. Mode
3. Variance
What is the mean test score for the 15 scores listed below?
5          6          4          7          8
1          2          0          6          9
8          4          8          6          3
1. 6
2. 5,1333…
3. 6,111…
A small business recorded the number of computers that were faulty each day for 10 days:
1 1 2 2 2 2 3 3 3 3
Find the mode.
1. 2
2. 2 and 3
3. The is no mode
The number of minutes a train is late each day for a period of 10 days are:
0 1 2 2 2 3 3 3 3 5
Find the median.
1. 2’5
2. 2 and 3
3. There is no median
Second quartile coincides with the
1. mean
2. median
3. mode
A group of friend have the following hair colours:
black blonde black blonde red
brown black brown brown blonde
The mean is:
1. Brown
2. Blonde
3. The mean cannot be calculated
Which of the following is NOT a measure of dispersion?
1. Range
2. Mean deviation
3. Skewness
The coefficient of variation is not very useful when:
1. the mean value is near zero
2. the extrema values are very big
3. there coefficient of variayion can always be calculated
A distribution is called leptokurtic when:
1. the excess kurtosis is positive
2. the excess kurtosis is zero
3. the excess kurtosis is negative
When the skeness is positive:
1. the distribution is skewed to the right
2. the distribution is symmetrical
3. the distribution is skewed to the left