·         Question 1

 

 

 

Seventy two percent of all observations fall within 1 standard deviation of the mean if the data is normally distributed.
 

Answer

 

 

 

Selected Answer:

False

Correct Answer:

False

 

 

 

 

·         Question 2

 

 

 

If two events are not mutually exclusive, then P(A or B) = P(A) + P(B)
 

Answer

 

 

 

Selected Answer:

False

Correct Answer:

False

 

 

 

 

·         Question 3

 

 

 

Probability trees are used only to compute conditional probabilities.
 

Answer

 

 

 

Selected Answer:

False

Correct Answer:

False

 

 

 

 

·         Question 4

0 out of 2 points

 

 

 

The minimin criterion is optimistic.
 

Answer

 

 

 

Correct Answer:

True

 

 

 

 

·         Question 5

0 out of 2 points

 

 

 

Using the minimax regret criterion, we first construct a table of regrets. Subsequently, for each possible decision, we look across the states of nature and make a note of the maximum regret possible for that decision. We then pick the decision with the largest maximum regret.
 

Answer

 

 

 

Correct Answer:

False

 

 

 

 

·         Question 6

 

 

 

Both maximin and minimin criteria are optimistic.
 

Answer

 

 

 

Selected Answer:

False

Correct Answer:

False

 

 

 

 

·         Question 7

0 out of 2 points

 

 

 

The equal likelihood criterion assigns a probability of 0.5 to each state of nature, regardless of how many states of nature there are.
 

Answer

 

 

 

Correct Answer:

False

 

 

 

 

·         Question 8

 

 

 

Assume that it takes a college student an average of 5 minutes to find a parking spot in the main parking lot.  Assume also that this time is normally distributed with a standard deviation of 2 minutes. Find the probability that a randomly selected college student will take between 2 and 6 minutes to find a parking spot in the main parking lot.

Answer

 

 

 

Selected Answer:

 

0.6247

Correct Answer:

 

0.6247

 

 

 

 

·         Question 9

0 out of 2 points

 

 

 

The chi-square test is a statistical test to see if an observed data fit a _________.

Answer

 

 

 

Correct Answer:

 

All of the above
 

 

 

 

 

·         Question 10

 

 

 

The metropolitan airport commission is considering the establishment of limitations on noise pollution around a local airport.  At the present time, the noise level per jet takeoff in one neighborhood near the airport is approximately normally distributed with a mean of 100 decibels and a standard deviation of 3 decibels.  What is the probability that a randomly selected jet will generate a noise level of more than 105 decibels?

Answer

 

 

 

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