MODULE 4 EXAM - DTSC 550 Question
and answers already passed
We run a chi-square test of independence and find a p-value of .005. Which of
the following is accurate? - correct answers The test was significant, so we
reject the null
Degrees of freedom for a chi-square test of independence is equal to which of
the following? - correct answers NOT n1+n2
In ANOVA, sum of squares is very similar to variance except - correct
answers it is not scaled to sample size
Which of the following is true for the F and t-distributions? - correct answers
The F-distribution is one-tailed
You are interested in seeing if there is a mean difference between number off
hours spent watching baseball for Yankees fans and Red Sox fans. You
would most likely want to run which test? - correct answers independent
samples t-test
In ANOVA, if a p-value is lower than alpha, which of the following can we
conclude? - correct answers At least one pair of population means are
different from each other (but we can't yet tell which one)
You are interested in determining if there is a mean difference between
people from Canada, Zimbabwe, and Germany. Which of the following would
be the best to run? - correct answers ANOVA
, If studying reading and writing scores of high school students, the average
difference between the scores of all high school students could be referred to
as the - correct answers parameter of interest
If you did multiple t-tests to see where group differences could be found, you
would inflate - correct answers Type I error
When doing multiple comparisons after an ANOVA, the Bonferroni correction
adjusts alpha by doing what? - correct answers Dividing alpha by the number
of comparisons
Chi-square goodness of fit tests utilize two or more categorical variables -
correct answers False
Which of the following are true? - correct answers All chi-square tests are
one-tailed
All chi-square values are positive
We have a p-value of 0.02 in a chi-square goodness of fit test. Which of the
following can we conclude? - correct answers NOT The test is significant and
we accept the alternative
Needs to reject
Two t-test:
Test 1: Group A and B have mean difference = 10
Test 2: Group C and D have mean difference = 15
and answers already passed
We run a chi-square test of independence and find a p-value of .005. Which of
the following is accurate? - correct answers The test was significant, so we
reject the null
Degrees of freedom for a chi-square test of independence is equal to which of
the following? - correct answers NOT n1+n2
In ANOVA, sum of squares is very similar to variance except - correct
answers it is not scaled to sample size
Which of the following is true for the F and t-distributions? - correct answers
The F-distribution is one-tailed
You are interested in seeing if there is a mean difference between number off
hours spent watching baseball for Yankees fans and Red Sox fans. You
would most likely want to run which test? - correct answers independent
samples t-test
In ANOVA, if a p-value is lower than alpha, which of the following can we
conclude? - correct answers At least one pair of population means are
different from each other (but we can't yet tell which one)
You are interested in determining if there is a mean difference between
people from Canada, Zimbabwe, and Germany. Which of the following would
be the best to run? - correct answers ANOVA
, If studying reading and writing scores of high school students, the average
difference between the scores of all high school students could be referred to
as the - correct answers parameter of interest
If you did multiple t-tests to see where group differences could be found, you
would inflate - correct answers Type I error
When doing multiple comparisons after an ANOVA, the Bonferroni correction
adjusts alpha by doing what? - correct answers Dividing alpha by the number
of comparisons
Chi-square goodness of fit tests utilize two or more categorical variables -
correct answers False
Which of the following are true? - correct answers All chi-square tests are
one-tailed
All chi-square values are positive
We have a p-value of 0.02 in a chi-square goodness of fit test. Which of the
following can we conclude? - correct answers NOT The test is significant and
we accept the alternative
Needs to reject
Two t-test:
Test 1: Group A and B have mean difference = 10
Test 2: Group C and D have mean difference = 15
