T-Test (Hypothesis Testing)

Created by

RAFAEL

Cards (35)

What is the purpose of t-test?
To compare the means of two groups
Which type of t-test is used for comparing the means of two independent groups?
Independent samples t-test
Which assumption is required for a t-test?
Homogeneity of variances
What is the null hypothesis in an independent samples t-test?
The means of the two groups are equal
What does a significant p-value in a t-test indicate?
The null hypothesis is rejected
What does Cohen's d measure in the context of a t-test?
The magnitude of the difference between group means
Which t-test is used when comparing the same group of individuals at two time points?
Paired t-test
If the Levene's test in an independent samples t-test is significant, what should you do?
Use the equal variances not assumed results
What is the critical value in a t-test?
The threshold of rejecting the null hypothesis
When is a one-sample t-test used?
To compare the mean of a single sample to a known value
Purpose of a t-test
To compare the means of two groups
Which t-test is used to compare two independent samples?
Independent samples t-test
What is the null hypothesis in a two-tailed t-test?
The means of two groups are equal
What assumption does the independent t-test require?
The variances of the two groups are equal
What does a p-value of 0.02 in a t-test suggest?
The null hypothesis is rejected at the 0.05 level
Which of the following measures the effect size in a t-test?
Tukey's HSD
When is the paired t-test used?
To compare means of a single group at two time points
Critical value in a t-test
The threshold for rejecting the null hypothesis
Test statistic in a t-test
The computed t-value used to assess significance
What does it mean if Levene's test is significant in an independent samples t-test?
The assumptions of the t-test are violated
Primary purpose of t-test
To compare the means of two groups
Which t-test is used to compare the means of a single group to a known value?
One-sample t-test
What is the null hypothesis in a one-sample t-test?
The sample mean equals the population mean
What is the main assumption of the independent samples t-test?
The variances between groups are equal
When is the paired samples t-test used?
To compare the same group at two times point
What does a two-tailed t-test assess?
Whether the means of two groups are significantly different in either direction
What does a significant p-value in a t-test indicate?
The null hypothesis is rejected
What is the formula of for degrees of freedom in an independent samples t-test?
$n1+$ $n2-2$
Which assumption is tested by Levene's test in a t-test?
Homogeneity of variances across groups
If Levene's test is significant, what should be done in an independent samples t-test
Use the "equal variances not assumed" results
What does Cohen's d measure in the context of a t-test?
The effect size or magnitude of the mean difference
Critical value in t-test
Threshold for rejecting the null hypothesis
Type I error in the context of t-test
Rejecting the true null hypothesis
It increases the power of a t-test
Increasing the sample size
Purpose of a one-sample t-test
To test whether the mean of a single group differs from a specified value.