Psychology Data Test Revision IA1 Unit 3

How do you calculate the mean of a dataset?

Add all values together, then divide by the number of values

Why is the mean sensitive to outliers?

Because extreme values can skew the average significantly

How do you find the median in a dataset?

Order the data from smallest to largest, then find the middle value (or average of two middle values if even count)

What does the median represent compared to the mean?

The median shows the central value and is less affected by outliers

What is the mode of a dataset?

The value that occurs most frequently

Can a dataset have more than one mode?

Yes, it can be bimodal or multimodal

What does a smaller standard deviation mean?

Less variability

Which condition shows more consistency: SD = 2.34 or SD = 1.96?

SD = 1.96 (experimental condition)

What is the threshold for statistical significance?

p < 0.05

If p = 0.02, is it significant? Which hypothesis is supported?

Significant

If p = 0.45, is it significant? Which hypothesis is supported?

Not significant

If p = 0.97, is it significant? Which hypothesis is supported?

Not significant

If p = 0.05, is it significant? Which hypothesis is supported?

Borderline significant

If p = 0.04, is it significant? Which hypothesis is supported?

Significant

If p = 0.11, is it significant? Which hypothesis is supported?

Not significant

What does r = 0.97 mean?

Strong positive correlation

What does r = -0.83 mean?

Strong negative correlation

What does r = 0.22 mean?

Weak positive correlation

What does r = 0.15 mean?

Very weak positive correlation

What does r = -45 mean?

Impossible value

What does extrapolation mean in graph analysis?

Predicting values beyond the measured data using the trend line

If snow depth at 400m is 12cm (line of best fit), what does that show?

The relationship between altitude and snow depth can be estimated using the trend line

If snow depth is 10cm, what does the line of best fit show about altitude?

Estimate the altitude where snow depth reaches 10cm using the trend line

If altitude is 600m, what does the line of best fit show about snow depth?

Estimate the snow depth at 600m using the trend line