WGU C955 Applied Probability
and Statistics Elaborate Study
Questions with Correct Answers
1. In a statistics class, 40 students are asked to write their age on a piece of
paper and place the paper in a box. After rotating and shaking the box, 5
pieces of paper are drawn from the box at random. The data results are as
follows:
36
22
21
20
19
What is the median for this data set?
A) 17
B) 21
C) 24
D) 28 - ANSWER 21
2. Histogram - ANSWER A graphical representation -- bars, measuring the
frequency within each interval
3. Skewed right - ANSWER Not a symmetric distribution, the tail is on the
right
,4. Measures of center - ANSWER Median, the mean (and mode)
5. Measures of spread - ANSWER Range, IQR & standard deviation
6. Standard Deviation Rule - ANSWER 68% of the data are within 1 standard
deviation,
95% are within 2,
99.7% are within 3 standard deviations from the mean.
7. median (for center) & IQR (for spread) - ANSWER skewed data uses these
for center and spread
8. Scatter plot - ANSWER A graphical representation of Q -> Q
9. Two way table - ANSWER A graphical representation of C -> C
10.Side-by side box - ANSWER A graphical representation of C -> Q
11.Which statement is true regarding the distribution of the histogram below?
{{ Positively skewed histogram }}
A) The mean of the distribution is greater than its median.
B) The median of the distribution is greater than its mean.
C) The mean and the median of the distribution are equal.
, D) The relationship between the mean and the median cannot be
determined from the histogram. - ANSWER The mean of the
distribution is greater than its median.
12.In one 12-hour shift, a nurse spends four hours at patient bedsides, two hours
pulling medications, one hour on breaks, two hours documenting, and three
hours doing other activities. An analyst would like to display the data by
representing the 12-hour shift as one whole.
Which display method should the analyst use to meet this goal?
A) Box plot
B) Stem plot
C) Histogram
D) Pie chart - ANSWER Pie chart
13.For which type of website data would a histogram be most appropriate?
A) Length of visit in minutes
B) Location of visitor by country
C) Frequently viewed pages
D) Most popular method of arrival - ANSWER Length of visit in
minutes
14.A coin has two sides: heads and tails. The coin is flipped three times.
Using H for heads and T for tails, what is the sample space for the given
experiment?
A) HHH, HHT, HTH, THH, HTT, THT, TTH, TTT
, B) HHH, HHT, TTH, TTT
C) HTH, THT, HTT, TTH, TTT, HHH
D) HHH, HHT, HTH, THH, TTT - ANSWER HHH, HHT, HTH, THH,
HTT, THT, TTH, TTT
15.A quiz consists of three true or false questions.
What is the probability that there are exactly two true answers?
A) 1/8
B) 3/8
C) 1/4
D) 3/4 - ANSWER 3/8
16.A six-sided die, with a number from 1 to 6 on each side, is rolled twice.
What is the probability that two odd numbers are rolled consecutively?
A) 1/2
B) 1
C) 1/4
D) 1/6 - ANSWER 1/4
17.A and B are events associated with an experiment with P( A) = .3 and P( B)
= .5.
If A and B are independent, then what is the probability that A or B occurs?
A) .15
B) .5
and Statistics Elaborate Study
Questions with Correct Answers
1. In a statistics class, 40 students are asked to write their age on a piece of
paper and place the paper in a box. After rotating and shaking the box, 5
pieces of paper are drawn from the box at random. The data results are as
follows:
36
22
21
20
19
What is the median for this data set?
A) 17
B) 21
C) 24
D) 28 - ANSWER 21
2. Histogram - ANSWER A graphical representation -- bars, measuring the
frequency within each interval
3. Skewed right - ANSWER Not a symmetric distribution, the tail is on the
right
,4. Measures of center - ANSWER Median, the mean (and mode)
5. Measures of spread - ANSWER Range, IQR & standard deviation
6. Standard Deviation Rule - ANSWER 68% of the data are within 1 standard
deviation,
95% are within 2,
99.7% are within 3 standard deviations from the mean.
7. median (for center) & IQR (for spread) - ANSWER skewed data uses these
for center and spread
8. Scatter plot - ANSWER A graphical representation of Q -> Q
9. Two way table - ANSWER A graphical representation of C -> C
10.Side-by side box - ANSWER A graphical representation of C -> Q
11.Which statement is true regarding the distribution of the histogram below?
{{ Positively skewed histogram }}
A) The mean of the distribution is greater than its median.
B) The median of the distribution is greater than its mean.
C) The mean and the median of the distribution are equal.
, D) The relationship between the mean and the median cannot be
determined from the histogram. - ANSWER The mean of the
distribution is greater than its median.
12.In one 12-hour shift, a nurse spends four hours at patient bedsides, two hours
pulling medications, one hour on breaks, two hours documenting, and three
hours doing other activities. An analyst would like to display the data by
representing the 12-hour shift as one whole.
Which display method should the analyst use to meet this goal?
A) Box plot
B) Stem plot
C) Histogram
D) Pie chart - ANSWER Pie chart
13.For which type of website data would a histogram be most appropriate?
A) Length of visit in minutes
B) Location of visitor by country
C) Frequently viewed pages
D) Most popular method of arrival - ANSWER Length of visit in
minutes
14.A coin has two sides: heads and tails. The coin is flipped three times.
Using H for heads and T for tails, what is the sample space for the given
experiment?
A) HHH, HHT, HTH, THH, HTT, THT, TTH, TTT
, B) HHH, HHT, TTH, TTT
C) HTH, THT, HTT, TTH, TTT, HHH
D) HHH, HHT, HTH, THH, TTT - ANSWER HHH, HHT, HTH, THH,
HTT, THT, TTH, TTT
15.A quiz consists of three true or false questions.
What is the probability that there are exactly two true answers?
A) 1/8
B) 3/8
C) 1/4
D) 3/4 - ANSWER 3/8
16.A six-sided die, with a number from 1 to 6 on each side, is rolled twice.
What is the probability that two odd numbers are rolled consecutively?
A) 1/2
B) 1
C) 1/4
D) 1/6 - ANSWER 1/4
17.A and B are events associated with an experiment with P( A) = .3 and P( B)
= .5.
If A and B are independent, then what is the probability that A or B occurs?
A) .15
B) .5
