Exam
Name___________________________________
MULTIPLE CHOICE.
Choose the one alternative that best completes the statement or answers the question.
For the given event, state whether the difference between what occurred and what you would have expected by chance is
statistically significant or not statistically significant.
1) A multiple choice question has 13 possible answers, only one of which is correct. A student makes a
random guess on the question and is correct.
1)
A) statistically significant
B) not statistically significant
Interpret the level of statistical significance for the event described.
2) A study of 600 college students taking Statistics 101
revealed that 58 students received the grade of
A.
Typically 10% of the class gets an A.
The difference between this group of students and the
expected value is not significant at the 0.05 level.
What does this mean in this case?
2)
A) The probability that the difference occurred due to chance is less than 0.05.
B) The probability of getting an A is 10% and only 9% got an A in this study.
The difference is
less than 5% so it is not significant.
C) The probability that the difference occurred due to chance is more than 0.05.
D) There is not enough information to make any conclusion.
For the observation described, state whether there is one way for the given observation to occur (outcome) or more than
one way for the given observation to occur (in which case it is an event).
3) Rolling at least one 5 with two fair dice
3)
A) Event
B) Outcome
4) Rolling a sum of 12 with two fair dice
4)
A) Event
B) Outcome
Find the indicated probability.
5) If you flip a coin three times, the possible outcomes are HHH, HHT, HTH, HTT, THH, THT, TTH,
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 Spring '08
 MOODY
 Statistics, Correlation and dependence, Pearson productmoment correlation coefficient, Dice, Spearman's rank correlation coefficient, negative correlation

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