Exam 10: Standard Deviation

A double glazing firm compares the number of windows in customers' orders in one month and produces the following data [number of windows(frequency)]: 0 to 2(15); 3 to 5(6); 6 to 8(3). Calculate the standard deviation of this data (2 decimal places).

You are told that wage levels are skewed to the right. What does this tell you about the value for Pearson's measure of skewness?

The mean price of a house in Bristol is £210,000 . In which city do house prices vary more?

Calculate the standard deviation (2 decimal places) from the following set of data: 4, 8, 12, 16

How might the variability of two distributions be compared assuming the means are not similar?

Which of the following statements about the standard deviation IS true?

In a flour mill 6 bags of flour are weighed to check for consistency. The weights of the bags are 0.95kg, 1.00kg, 1.10kg, 1.05kg, 0.95kg, 1.10kg. Calculate the standard deviation of these samples (2 decimal places)

Calculate the coefficient of variation for a data set where the mean is 3 and the standard deviation is 0.5 (1 decimal place).

Calculate Pearson's measure of skewness for data that has a mean of 8, a mode of 4 and a standard deviation of 0.8

Why is the standard deviation often considered a better measure of dispersion than the mean deviation?