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QMB 3200 Test 1.
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Exam of 10 pages for the course NR 509 Final Exam at NR 509 Final Exam (QMB 3200 Test 1.)
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QMB 3200 Test 1What is the z score formula? - ANS-(the observation - mean) / standard deviation
What does a z score tell us? - ANS-how many standard deviations a value of from the
mean
How do you find the range? - ANS-biggest value minus smallest value
What is the formula used in excel to find the range? - ANS-=max(array) - min (array)
If a data set has an odd number of observations, the median
a. Cannot be determined
b. is the value of the middle item when all items are arranged in ascending order
c. is the average value of the two middle items when all items are arranged in
ascending order.
d. must be equal to the mean - ANS-b. is the value of the middle item when all items are
arranged in ascending order
Which of the following represents the data point that occurs most frequently in a set of
observations?
a. Mean
b. Mode
c. All of these choices are correct
d. Median - ANS-b. Mode
The median of a data set is represented by the:
a. 50th percentile
b. 75th percentile
c. 100th percentile
d. 25th percentile - ANS-a. 50th percentile
Which of the following is a possible reason for an outlier in a data set?
a. A mistake was made while taking a measurement or entering it into the computer
, b. The individual in question belongs to a different group than the bulk of individuals
measured
c. The outlier is a legitimate data value and represents natural variability for the group
and variables measured
d. All of these choices are possible reasons for an outlier - ANS-d. All of these choices
are possible reasons for an outlier
The following is the frequency distribution for the ages of a sample of senior citizens
who attend a local bingo night. What is the standard deviation for this data set?
Age / Frequency
60-
65-
70-
75-
Total: 40
a. 47.8
b. 4.19
c. 17.54
d. 68 - ANS-b. 4.19
A table or rule that assigns probabilities to the possible values of a discrete random
variable X is called the:
a. probability function
b. expected value
c. conditional probability
d. five-number summary - ANS-a. probability function
Which of the following is a characteristic of a binomial experiment?
a. The trials are dependent
b. Each trial results in one of three outcomes
c. The probability of a failure, 1 - p remains constant from trial to trial
d. The experiment consists of n different trials - ANS-c. The probability of a failure, 1 - p
remains constant from trial to trial
A random variable:
a. can be classified as being continuous
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