STA 220 LATEST EDITION END
TERM COMPLETE EXAM
QUESTIONS WITH CORRECT
VERIIFIED SOLUTIONS!!!UPDATED
2025/2026 A+ GRADED!!!
1. When looking at the results of a 95% confidence interval, we can
predict what the results of the two-sided significance test will be: -
ANSWER ✓ at alpha = 0.05
2. In 2008, the General Social Survey asked 1335 people how many
hours a day did they watch television. A 95% confidence interval
for the average amount of hours that Americans watch television
per day is between 2.70 and 2.95. What can we conclude about the
significance test of Ho: mu = 2.5 vs. Ha: mu does not equal 2.5? -
ANSWER ✓ It's p-value will be smaller than 0.05 (since the 95%
confidence interval does NOT include 2.5, we would reject Ho: mu
= 2.5 at alpha = 0.05)
3. Suppose that you had consumer group wanted to test to see if
weight of participants in a weight loss program changed (up or
down). They computed a 95% confidence interval of the result (-
4.977, 2.177). Suppose that we had a significance test with the
following hypothesis:
4. Ho: population mean weight loss = 0
5. Ha: population mean weight loss does not equal 0
6. What do we know about the p-value for the test? - ANSWER ✓ it
would be greater than 0.05 (because the confidence interval goes
from negative to positive and that means that there's no significant
difference)
, 7. A test of Ho: mu=17 vs Ha: mu not=17 resulted in a p-value of
0.03. We can predict that, using the same data set:
8. -the 90% CI for mu BLANK include 17
9. -the 95% CI for mu BLANK include 17
10. -the 99% CI for mu BLANK include 17 - ANSWER ✓ 1.
will
11. 2. will not
12. 3. will not
13. The results of a confidence interval and significance test
should agree as long as: - ANSWER ✓ -both are conducted on the
same data set
14. -the significance test is two-sided
15. -we are making inferences about means
16. What is the probability of an event that is impossible?
Suppose that a probability is approximated to be zero based on
empirical results. Does this mean that the event is impossible? -
ANSWER ✓ 0, and No because when a probability is based on an
empirical experiment, a probability of zero does not mean that the
event cannot occur
17. In a probability model, the sum of the probabilities of all
outcomes must equal 1. - ANSWER ✓ true
18. In probability, ________ is any process that can be repeated
in which the results are uncertain. - ANSWER ✓ experiment
19. The probability 0.37 means that approximately 37 out of
every 100 dealt hands will be that particular hand. No, you will not
be dealt this hand exactly 37 times since the probability refers to
what is expected in the long-term, not short-term. - ANSWER ✓
yup
TERM COMPLETE EXAM
QUESTIONS WITH CORRECT
VERIIFIED SOLUTIONS!!!UPDATED
2025/2026 A+ GRADED!!!
1. When looking at the results of a 95% confidence interval, we can
predict what the results of the two-sided significance test will be: -
ANSWER ✓ at alpha = 0.05
2. In 2008, the General Social Survey asked 1335 people how many
hours a day did they watch television. A 95% confidence interval
for the average amount of hours that Americans watch television
per day is between 2.70 and 2.95. What can we conclude about the
significance test of Ho: mu = 2.5 vs. Ha: mu does not equal 2.5? -
ANSWER ✓ It's p-value will be smaller than 0.05 (since the 95%
confidence interval does NOT include 2.5, we would reject Ho: mu
= 2.5 at alpha = 0.05)
3. Suppose that you had consumer group wanted to test to see if
weight of participants in a weight loss program changed (up or
down). They computed a 95% confidence interval of the result (-
4.977, 2.177). Suppose that we had a significance test with the
following hypothesis:
4. Ho: population mean weight loss = 0
5. Ha: population mean weight loss does not equal 0
6. What do we know about the p-value for the test? - ANSWER ✓ it
would be greater than 0.05 (because the confidence interval goes
from negative to positive and that means that there's no significant
difference)
, 7. A test of Ho: mu=17 vs Ha: mu not=17 resulted in a p-value of
0.03. We can predict that, using the same data set:
8. -the 90% CI for mu BLANK include 17
9. -the 95% CI for mu BLANK include 17
10. -the 99% CI for mu BLANK include 17 - ANSWER ✓ 1.
will
11. 2. will not
12. 3. will not
13. The results of a confidence interval and significance test
should agree as long as: - ANSWER ✓ -both are conducted on the
same data set
14. -the significance test is two-sided
15. -we are making inferences about means
16. What is the probability of an event that is impossible?
Suppose that a probability is approximated to be zero based on
empirical results. Does this mean that the event is impossible? -
ANSWER ✓ 0, and No because when a probability is based on an
empirical experiment, a probability of zero does not mean that the
event cannot occur
17. In a probability model, the sum of the probabilities of all
outcomes must equal 1. - ANSWER ✓ true
18. In probability, ________ is any process that can be repeated
in which the results are uncertain. - ANSWER ✓ experiment
19. The probability 0.37 means that approximately 37 out of
every 100 dealt hands will be that particular hand. No, you will not
be dealt this hand exactly 37 times since the probability refers to
what is expected in the long-term, not short-term. - ANSWER ✓
yup
