Mat540-quiz-2 ANSWER

·         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