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Grade 12 Mathematics, Data handling and probability

Define the term correlation.

Grade 12 Mathematics, Data handling and probability

Correlation is the extent of the correspondence between the ordering of two random variables. We can use the correlation coefficient below to describe the strength of the correlation.

Grade 12 Mathematics, Data handling and probability

What is the correlation formula?

Grade 12 Mathematics, Data handling and probability

The formula for correlation is:

Grade 12 Mathematics, Data handling and probability

What do we mean by a frequency distribution?

Grade 12 Mathematics, Data handling and probability

A frequency distribution is a graphical representation of data in which you plot sample items on the horizontal axis and the frequency of their occurrence on the vertical axis.

Grade 12 Mathematics, Data handling and probability

In statistics, what is the interquartile range?

Grade 12 Mathematics, Data handling and probability

The interquartile range is the difference between the lower quartile and the upper quartile of a list of numerical data.

Grade 12 Mathematics, Data handling and probability

In statistics, what is the least squares regression line?

Grade 12 Mathematics, Data handling and probability

The least squares regression line is the line that best fits the data, calculated according to the least squares method of regression.

Grade 12 Mathematics, Data handling and probability

In statistics, what is the line of best fit?

Grade 12 Mathematics, Data handling and probability

The line of best fit is a line drawn by hand that best fits the general tendency of the data on a scatter plot.

Grade 12 Mathematics, Data handling and probability

In statistics, how do we find the lower and upper quartiles?

Grade 12 Mathematics, Data handling and probability

The lower quartile is the median of the lower half of a list of numerical data. The upper quartile is the median of the upper half of data.

Grade 12 Mathematics, Data handling and probability

What are the measures of central tendency of a set of data?

Grade 12 Mathematics, Data handling and probability

The measures of central tendency describe the data and include the mode, median and quartiles of a set of numerical data.

Grade 12 Mathematics, Data handling and probability

In statistics, what is the median?

Grade 12 Mathematics, Data handling and probability

The median is the middle value in a list of numerical data.

Grade 12 Mathematics, Data handling and probability

In statistics, what is the mode?

Grade 12 Mathematics, Data handling and probability

The mode is the value that occurs most often in a list of numerical data.

Grade 12 Mathematics, Data handling and probability

Describe a normal distribution of data.

Grade 12 Mathematics, Data handling and probability

A normal distribution is a bell-shaped distribution of the data.

Grade 12 Mathematics, Data handling and probability

In statistics, what is the difference between a population and a sample?

Grade 12 Mathematics, Data handling and probability

The population is the entire group of people or items that researchers want to study. The sample is a small group of people or items selected from the population.

Grade 12 Mathematics, Data handling and probability

Define probability.

Grade 12 Mathematics, Data handling and probability

Probability is the likelihood or chance of an event occurring.

Grade 12 Mathematics, Data handling and probability

What is a scatter plot?

Grade 12 Mathematics, Data handling and probability

A scatter plot is the graphical representation of data with individual dots at each data point.

Grade 12 Mathematics, Data handling and probability

In statistics, what is the standard deviation?

Grade 12 Mathematics, Data handling and probability

The standard deviation is the measure of the range of possible values given by the data.

Grade 12 Mathematics, Data handling and probability

In statistics, what is the variance?

Grade 12 Mathematics, Data handling and probability

The variance is the average of the squared deviations from the mean. The standard deviation is the square root of the variance.

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