An Experiment Was Done to Look at Whether There Is

question 12

Multiple Choice

An experiment was done to look at whether there is an effect of the number of hours spent practising a musical instrument and gender on the level of musical ability. A sample of 30 (15 men and 15 women) participants who had never learnt to play a musical instrument before were recruited. Participants were randomly allocated to one of three groups that varied in the number of hours they would spend practising every day for 1 year (0 hours, 1 hours, 2 hours) . Men and women were divided equally across groups. All participants had a one-hour lesson each week over the course of the year, after which their level of musical skill was measured on a 10-point scale ranging from 0 (you can't play for toffee) to 10 ('Are you Mozart reincarnated?') .
-An ANOVA was conducted on these data, and the results revealed significant main effects of gender and the number of hours spent practising. Which of the following contrasts could we use to break down the effect of gender?

• A)Repeated contrast
• B)Helmert contrast
• C)None
• D)Simple contrast

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Definitions:

Significance Level

A threshold in hypothesis testing that determines the probability of rejecting a true null hypothesis, denoted as alpha (α).

Population Variance

The measure of the dispersion of all values in a population from the population mean.

Population Variance

A measure of the spread or dispersion within a set of data points in a population, indicating how much the data varies from the average.

Dog Food

A type of food specifically formulated and intended for consumption by dogs, made from various ingredients.