Ashford BUS 308 Week 2 Quiz with 100% Correct Answers

1. Question : In the application of Bayes' Theorem the sample information is combined with prior probabilities to obtain posterior probabilities.

  Student Answer:     True

     False

 2. Question : The actual weight of hamburger patties is an example of a continuous random variable.

  Student Answer:     True

     False

 3. Question : A student's grade on an examination was transformed to a z value which is negative. Therefore, we know that he scored

  Student Answer:   higher than 16% of the class.

     higher than 45% of the class.

     above the first quartile.

      below the mean.

     above the mean but below the median.

 4. Question : The expected value of a discrete random variable is:

  Student Answer:    ∑x p(x)

     n ∙p ∙q

     ∑(x - µx)2 p(x)

 5. Question : The following formula: P(A U B) = P(A) + P(B) - P(A ∩ B) represents

  Student Answer:    the conditional probability.

      the addition rule.

     independence.

     the multiplication rule.

     None of the above.

 6. Question : A standard normal distribution has a mean of ____and standard deviation of ____

  Student Answer:   zero, zero.

      zero, one.

     one, one.

     one, zero.

 7. Question : A(n) __________ is a measure of the chance that an uncertain event will occur.

  Student Answer:   experiment

     sample space

      probability

     complement

     population

 8. Question : The MPG (mileage per gallon) for a mid-size car is normally distributed with a mean of 32 and a standard deviation of .8. What is the probability that the MPG for a selected mid-size car would be less than 33.2?

  Student Answer:   43.32%

     6.68%

      93.32%

     86.64%

     13.36%

 9. Question : For a Poisson random variable the mean and the variance equal the average number of occurrences over the time interval (µx = ó2x = µ)

  Student Answer:     True

      False

 10. Question : In a statistical study, the random variable X = 1, if the house is colonial, and X = 0 if the house is not colonial, then it can be stated that the random variable is continuous.

  Student Answer:     True

      False