Pre-Assessment Unit 9 Data Analysis

Select the correct list which identifies all measures of central tendency.

• Mean, Median, Mode, Standard Deviation and Range

• Mean, Median, Mode and Standard Deviation

• Mean, Median and Mode

• Standard Deviation and Range

• Mean, Median, Mode and Range

Select the correct definition from the answers below which accurately defines mean.

• The “average” measure, calculated by adding up all the values and dividing the answer by the number of values.

• The middle value in a series of numbers

• The score that occurs mots frequently in a set of data

The histogram represents which type of modal distribution?

• Uni-modal

• Bi-modal

• Multi-modal

Select the correct list that identifies all measures of dispersion/variance.

• Range and Mean

• Standard Deviation, Median, Mean and Range

• Mean, Standard Deviation and Range

• Range and Standard Deviation

In academic research, a 'z-score' represents which measure of dispersion/variance?

• Range

• Standard Deviation

On a normal distribution curve, what percentage of values would be within 1 standard deviation of the mean?

• 99%

• 95%

• 68%

• 56%

How many peaks should a normal distribution curve have?

• 1

• 2

• 3

• 4

Select the correct definition which accurately defines 'positively skewed' (data).

• Longer tail of the curve points to the negative (lower) end of the scale, meaning scores are bunched to the right of the centre.

• Longer tail of the curve points to the positive (higher) end of the scale, meaning scores are bunched to the left of the centre.

• Asymmetry in a statistical distribution

The following histogram represents positively or negatively skewed data?

• Positively Skewed Data

• Negatively Skewed Data