Frequency Distribution of the Scores from a Mathematics Test Is

question 164

Short Answer

Frequency distribution of the scores from a mathematics test is given in the table below. Find the sample standard deviation.
  $$\begin{array} { | l | l | l | l | } \hline \text { Interval } & \text { Midpoint } x & \text { Frequency } f & \text { Product } x f \\\hline 58.5 - 65.5 & & 3 & \\\hline 65.5 - 72.5 & & 5 & \\\hline 72.5 - 79.5 & & 8 & \\\hline 79.5 - 86.5 & & 6 & \\\hline 86.5 - 93.5 & & 3 & \\\hline 93.5 - 100.5 & & 5 & \\\hline\end{array}$$  
Please round your answer to the nearest whole number, if necessary.

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Definitions:

Lever Pressing

An experimental task used in behaviorism to study learning and conditioning, where subjects press a lever to receive a reward.

Dependent Variable

The variable in an experiment that is tested and measured, often seen as the effect or outcome influenced by the independent variable.

Classical Conditioning

A learning process that occurs through associations between an environmental stimulus and a naturally occurring stimulus, famously demonstrated by Pavlov's dogs experiment.

Conditioned Response

A learned response to a previously neutral stimulus that occurs after conditioning or training.