Confidence Intervals and Effect Sizes
A common level of confidence for a confidence interval is...
What is 80, 90, 95, or 99%
The exact shape of the t distribution depends on this
The purpose of a one-sample t test
The purpose of an independent samples t-test
What is to compare the means of two independent groups
The purpose of a related samples t-test
What is to compare the means of two related sets of scores?
In a confidence interval, the ________ extends equally in both directions away from the sample mean
What is the margin of error?
What is the population standard deviation?
Degrees of freedom for one-sample (and related samples) t-tests is calculated as...
The type of variance that we calculate for an independent samples t-test is...
What is pooled variance?
MD means this
What is sample mean difference?
A Cohen's d value of 0.8 corresponds to a ______ effect size
When a researcher rejects a null hypothesis that is actually true, what may have occurred?
The formula for a t statistic is the sample mean subtract population mean divided by...
What is the estimated standard error?
The degrees of freedom for independent samples t-test is...
Related samples t-tests can be used when one sample is in two conditions/tested twice, or when...
Two samples are paired/matched?
A confidence interval is a range of values centered around __________.
What is a sample statistic or sample mean?
The two factors that impact results of a hypothesis test are...
What are variability and sample size?
The value for the population mean could be known, or it could be obtained from...
What is a theory, logical prediction, previous evidence, etc?
Homogeneity of variances is most important when...
One of the problems with related samples designs when the same group is measured twice is...
Cannot account for outside factors that caused the change; participation in condition 1 could impact performance in condition 2 unless there is counterbalancing
The two factors that affect the width of a confidence interval
What are the confidence level/percentage of confidence and sample size?
What the Greek letter beta refers to
What is Type II error?
A basic conclusion frame for a one-samples t test is...
There is [or is not] a significant difference between the sample mean and the population mean
A basic conclusion frame for an independent samples t-test is...
There is [or is not] a significant difference in [dependent variable] between group 1 and group 2.
A basic conclusion frame for a related samples t-test is...
There is [or is not] a significant mean difference in [dependent variable] between [condition 1] and [condition 2].