INFERENCE FOR RELATIONSHIPS CHECKPOINT test
The following questions present you with a scenario, and you need to choose the most appropriate statistical test in each case.
Question 1 of 8
At the beginning of the semes
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INFERENCE FOR RELATIONSHIPS CHECKPOINT test
The following questions present you with a scenario, and you need to choose the most appropriate statistical test in each case.
Question 1 of 8
At the beginning of the semester, students who registered for a statistics course were randomly assigned to two sections, each taught by a different instructor. At the end of the semester, we would like to test whether there are differences in performance on the final exam between the two sections.
matched pairs t-test
two-sample t-test
ANOVA
chi-squared test for independence
inference for regression
Good job! By randomly assigning students to a section, we've formed two independent samples. A two-sample t-test is therefore the appropriate test.
Question 2 of 8
Advertising researchers claim that the power of curiosity can be harnessed to design an effective Internet advertising strategy that results in a better evaluation of the advertised product. They develop six advertising texts with varying amounts of "curiosity" triggers. College students are randomly assigned to one of the six versions of the advertisement text and their evaluation score of the advertised product is recorded.
matched pairs t-test
two-sample t-test
ANOVA
chi-squared test for independence
inference for regression
Good job! ANOVA is used for comparing more than two groups, and therefore can be used to determine if the mean evaluation score is the same for all six advertising texts.
Question 3 of 8
To test whether Internet use increases depression score, we measure the depression scores of a random sample of non-Internet-users, have them use the Internet for a specified time, then measure their depression scores again.
matched pairs t-test
two-sample t-test
ANOVA
chi-squared test for independence
inference for regression
Good job! Since we are measuring the depression scores of the same group of subjects, before and then after using the Internet, the matched pairs t-test is appropriate.
Question 4 of 8
Researchers question whether college students' choice of declared academic major is related to gender.
matched pairs t-test
two-sample t-test
ANOVA
chi-squared test for independence
inference for regression
Good job! A chi-squared test for independence will determine if there is an association between the two categorical variables, gender and declared academic major.
Question 5 of 8
We want to test for a relationship between race and marital status (married/never married/divorced/widowed).
matched pairs t-test
two-sample t-test
ANOVA
chi-squared test for independence
inference for regression
This is not quite right. Notice that each subject falls into one race category as well as one marital status category and you want to test if there is a significant relationship between these two variables. Consider the remaining options. (D) is the right answer.
The next three questions refer to the following information:
A researcher wants to explore the relationship between the following two variables, Weight 1 and Weight 2.
For each question below, choose the most appropriate inference method to analyze these data, under the given scenarios.
Question 6 of 8
Suppose that Weight 1 is the weight (in pounds) of a sample of five individuals before beginning a weight-loss diet, and Weight 2 is the weight in (pounds) of the same five individuals after the diet. If we would like to test the effectiveness of the diet, which of the following is the appropriate inference method?
matched pairs
two independent samples
inference for regression
Good job! A matched pairs study may be carried out, where each observation in one sample is matched/paired/linked with an observation in the other sample. In this case, we have the pairs of before-diet and after-diet weights of each individual.
Question 7 of 8
In preparing for a balsa wood bridge challenge, students weighed (in g) a random sample of five balsa wood designs and recorded these data as Weight 1. They also recorded the maximum weight (in kg) that the bridge could support. If the students want to know if there is an association between the weight of the bridge (in g) and the maximum weight supported (in kg), which of the following is the appropriate inference method?
matched pairs
two independent samples
inference for regression
Good job! The students want to know if there is an association between the weight of the balsa wood and the weight that the bridge supported.
Question 8 of 8
If Weight 1 is the weight (in pounds) of a random sample of five men who were accepted as models, and Weight 2 is the weight (in pounds) of a random sample of five men who were rejected as models, which of the following is the appropriate inference method?
matched pairs
two independent samples
inference for regression
Good job! The weights are from two independent samples that we are comparing.
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