Statistics Quiz

What is the purpose of hypothesis testing?

• To draw conclusions about the sample data

• To draw conclusions about the population of interest

• To collect data for future research

• To create a hypothesis

What does the null hypothesis state?

• The researcher's experiment was successful

• There is a change or relationship between variables

• The treatment has no effect

• The sample mean is equal to the population mean

What is the decision rule for rejecting the null hypothesis?

• If obtained probability > a, reject Ho

• If obtained probability = a, reject Ho

• If obtained probability > a, retain Ho

• If obtained probability < a, retain Ho

When is the t-statistic used in hypothesis testing?

• To calculate the variance of a population

• To determine the standard deviation of a sample

• To measure an unknown population mean

• To compare the means of three or more groups

What is the purpose of a two-tailed t-test?

• To measure the effect of a treatment on a population

• To determine if one population is greater than the other

• To determine if two populations are different from each other

• To compare the means of two groups

What is a repeated measures design used for?

• To evaluate the mean difference between two populations

• To compare two independent samples

• To measure the change between two variables

• To simulate a repeated-measures design

What is the critical value based on in hypothesis testing?

• The mean difference

• The standard error

• The sample size

• The level of significance

When is an independent-measures research design used?

• To test the effect of a treatment on a population

• To evaluate the mean difference between two populations

• To measure the cognitive function of adults

• To compare two groups of individuals

What does the mean difference refer to in independent-measures research?

• The effect size of a treatment

• The correlation between two variables

• The standard deviation of the sample

• The average value of difference scores

What is the purpose of a one-tailed t-test?

• To measure the effect of a treatment on a population

• To compare the means of two groups

• To determine if one population is greater than the other

• To determine if two populations are different from each other