We Took a Sample of Children Who Had Been Learning

question 13

Multiple Choice

We took a sample of children who had been learning to play a musical instrument for five years. We measured the number of hours they spent practising each week and assessed their musical skill by how many of 8 increasingly difficult exams they had passed. We also asked them whether their parents forced them to practise or not (were their parents pushy?) . What does the graph suggest about children who spend approximately 1 hour practising a week?

• A)They were less affected by having a pushy parent than those that practised for 7 hours.
• B)They had less variability in their ability than those who didn't practise at all.
• C)On average, these children will be more musically skilled if they do not have pushy parents than if they do have pushy parents.
• D)On average, these children will be more musically skilled if they have pushy parents than if they do not have pushy parents.

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Definitions:

Observed Time

The actual amount of time measured for a task or process to be completed, as opposed to estimated or standard time.

Allowance Factor

A coefficient applied to account for uncertainties, variations, or additional capacity in calculations or designs.

Standard Time

The pre-determined time allowed for the completion of a specific task, under normal working conditions.

Performance Rating

An evaluation measure used to assess the efficiency, effectiveness, or output level of employees, processes, or equipment against predefined standards.