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
One of the assumptions of t tests is that the populations from which the sample(s) are selected must be...
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, 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...
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?
In general, calculating a t statistic by hand has these three parts (a, b, c). The first and second parts are...
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].