AQA Psychology Descriptive Statistics

Which of the following is not a measure of central tendency?

• Mean

• Standard deviation

• Median

• Mode

Which of the following statements about the mean is false?

• It is more representative of the scores in a data set than the other measures of central tendency

• It is the most sensitive measure of central tendency

• It includes all of the scores in the data set in its calculation

• It is the best measure of central tendency to use if there are extreme values

Which of the following is not a strength of the mode?

• There may be more than one mode

• It is the only measure of central tendency you can use with data in categories

• It is easy to calculate

• It is always a value in the data set

Which of the following is a limitation of the median?

• It is badly affected by extreme scores

• There may be more than one median

• It is less sensitive than the mean as it does not include all the

  scores

• It is difficult to calculate

Which of the following is a measure of dispersion?

• Bar chart

• Scattergram

• Mean

• Range

What type of graph is used to represent a relationship between two variables?

• Line graph

• Pie Chart

• Histogram

• Scattergram

Which of the following statements about bar charts is false?

• The bars on a bar chart should touch each other

• Bar charts are used when data is divided into categories

• The bars on a bar chart should not touch each other

• Bar charts can be used to display differences in mean scores

Which of the following statements about normal distributions is false?

• The pattern of scores is sometimes called the 'bell shaped curve'

• Data can be skewed at one end

• The pattern of the data is symmetrical

• If data is normally distributed the mean, median and mode are all at the midpoint of the curve

If data is normally distributed, what percentage of scores fall between one standard deviation below and one standard deviation above the mean value?

• 62.50%

• 34.13%

• 68.26%

• 99.73%

If the standard deviation for a set of data is low, what does this tell us about the scores?

• The standard deviation is wrong

• They are skewed

• They are tightly clustered around the mean

• They are normally distributed