Psychology Statistics

When comparing data, if one has a larger Standard Deviation this means

• It has a bigger average

• The data is less variable and spread

• The data is more variable and less consistant

• It has more participants responding

For a P value to be significant it must be

• More than 50%

• Less than 50%

• 0.10 and below

• <0.05

We can calculate and r vulue using Pearson's Correlation Coefficient to

• Show the strength of relationship between two variables and how this close this is to the line of best fit

• See how spread data is

• conclusively determine if one variable causes changes in the other variable

• Make the graph look better by putting a straight line in

What is true about error bars?

• They only show Standard Deviation

• If they are small, the data is more accurate than if they are large.

• If they are big, data is more reliable than if they are small

• If they overlap, this suggests that data is not statistically significant

What are the two conditions that must be present in a data set for a t-test to be correctly used?

• The sample size of each group in the data must be more than 20

• Heaps of people have been used

• It is longitudinal research, using one group

• The data must be normally distributed

Which r value/s indicates the strongest relationship?

• -0.7

• -0.3

• 0.3

• 0

• 0.7

Identify the type of relationship between weight and price.

• The price is never 0 on the graph

• There is a positive linear correlation between weight and price

• There is a negative linear correlation between weight and price

• The price gets high at the end of the graph

Choose the options that fill in the blanks:

The r value in a set of data shows a stronger relationship between variables when it is closest to/is _______ and weaker when it is near or is _______.

• 0.5 and 1

• 0 and 1

• -1/1 and 0

• 1 and 0

A t-test is used

• To see if results were wrong

• By one researcher to make another's research invalid

• To determine if there is a statistically significant difference between 2 means

• On any research you conduct in Psychology

A p value of 0.04 indicates that the difference between two group means....

• Is the best possible number to get

• Results are not statistically significant

• That it has a probability of 4% that it happened by chance

• Results are statistically significant