WGU C207 Data Driven Decision Making
Questions and Answers Updated
2026/2027 Version | Verified Answers
1. A good sample of the population being studied will be the right size and
___________ - ANSWER ✅ Random
2. If a sample is not random it creates ____________ - ANSWER ✅
Measurement Bias
3. If a sample is not the right size it creates ___________ - ANSWER ✅
Measurement Bias
4. Measuring the housing market in North Carolina when making an inference
about the entire East coast is an example of __________ - ANSWER ✅
Non-representative Sample
5. Lemonade sales increase when it is warmer than 75 degrees. Weather and
lemonade are __________ - ANSWER ✅ Correlated. "NOT CAUSE"
6. Pulling names from a hat is a tool to create a ______ sample - ANSWER ✅
Random
,7. Asking participants to taste test a yellow candy and a blue candy and select
one can create bias. How can we prevent bias? - ANSWER ✅ Blinding
8. You are taking a survey and the question is leading. It seams advantageous
to answer a specific way. What type of bias is this? - ANSWER ✅
Conscious KEYWORD: Benefit
9. A question is not leading, but you feel your boss might want you to answer a
specific way - ANSWER ✅ Response You feel there is an "expected"
response and may not answer honestly (no leading )
10.pread of the data - ANSWER ✅ Standard Deviation A normally distributed
sample spreads from -3 to +3 standard deviations from the mean
11.We should not use this measure of central tendency alone for decisions
because it includes outliers - ANSWER ✅ Mean
12.The best measure of central tendency when making decisions - ANSWER ✅
Median
13.We use this measure of central tendency if we want to know what happens
the most - ANSWER ✅ Mode (most can also be defined as typical or
common)
14.If the mean is 50 and the standard deviation is 5, what is the probability of
being between 45 and 55? - ANSWER ✅ 68.2% (of the sample will be
within 1 standard deviation of the mean) 50 - 5 = 45 and 50 + 5 + =55
,15.What are the three probabilities of the bell curve? - ANSWER ✅ 68.2%
95.4% 99.7%
16.68.2% of a sample will be within _______ standard deviation of the mean. -
ANSWER ✅ 1
17.95.4% of a sample will be within ______ standard deviations of the mean. -
ANSWER ✅ 2
18.99.7% of a sample will be within _____ standard deviations of the mean. -
ANSWER ✅ 3
19.The mean is 20 and the standard deviation is 2, what is the probability of
being between 14 and 26 - ANSWER ✅ 99.7% (of the sample will be
within 3 standard deviations of the mean) 20 + 2 + 2 + 2 = 26 and 20 - 2 - 2 -
2 = 14
20._______ can be used to differentiate between two samples with the same
mean. - ANSWER ✅ Variation
21.Which measurement can tell us where a single data point is on the bell
curve? - ANSWER ✅ z-score. (Tip: Remember z for me. Where are you in
the curve of your peers)
22.You want to know how your height compares to all of your family tree. How
do you calculate a z score? - ANSWER ✅ (Your height - the mean of the
family tree height) divided by the standard deviation of the family tree
height (me-mean)/standard deviaiton
, 23.You are 63" tall and the family tree averages 67" with a standard deviation
of 2". What is your z-score? - ANSWER ✅ (63-67)/2 = -2 You are 2
standard deviations shorter than the family tree.
24.Which measure lets you measure your height compared to your maternal
family tree and your height compared to your paternal family tree? -
ANSWER ✅ z-scores let us measure two samples by putting them to the
same scale.
25.There are four shopping carts available and one has a broken wheel. What is
your probability of selecting the cart with the broken wheel? - ANSWER ✅
25% (1/4 = 0.25)
26.There is a 20% of parking close to the door and a 30% chance of getting the
shopping cart with a squeaky wheel. How do we calculated the probability
of both events occurring? - ANSWER ✅ Multiply Key Words: AND, ALL,
BOTH
27.There is a 20% of parking close to the door and a 30% chance of getting the
shopping cart with a squeaky wheel. How do we calculated the probability
of either event occurring? - ANSWER ✅ Addition Key Words: OR,
EITHER
28.Multiplying two events calculates an ____________ - ANSWER ✅
Intersection
29.Adding two events calculates a _______________ - ANSWER ✅ Union
Questions and Answers Updated
2026/2027 Version | Verified Answers
1. A good sample of the population being studied will be the right size and
___________ - ANSWER ✅ Random
2. If a sample is not random it creates ____________ - ANSWER ✅
Measurement Bias
3. If a sample is not the right size it creates ___________ - ANSWER ✅
Measurement Bias
4. Measuring the housing market in North Carolina when making an inference
about the entire East coast is an example of __________ - ANSWER ✅
Non-representative Sample
5. Lemonade sales increase when it is warmer than 75 degrees. Weather and
lemonade are __________ - ANSWER ✅ Correlated. "NOT CAUSE"
6. Pulling names from a hat is a tool to create a ______ sample - ANSWER ✅
Random
,7. Asking participants to taste test a yellow candy and a blue candy and select
one can create bias. How can we prevent bias? - ANSWER ✅ Blinding
8. You are taking a survey and the question is leading. It seams advantageous
to answer a specific way. What type of bias is this? - ANSWER ✅
Conscious KEYWORD: Benefit
9. A question is not leading, but you feel your boss might want you to answer a
specific way - ANSWER ✅ Response You feel there is an "expected"
response and may not answer honestly (no leading )
10.pread of the data - ANSWER ✅ Standard Deviation A normally distributed
sample spreads from -3 to +3 standard deviations from the mean
11.We should not use this measure of central tendency alone for decisions
because it includes outliers - ANSWER ✅ Mean
12.The best measure of central tendency when making decisions - ANSWER ✅
Median
13.We use this measure of central tendency if we want to know what happens
the most - ANSWER ✅ Mode (most can also be defined as typical or
common)
14.If the mean is 50 and the standard deviation is 5, what is the probability of
being between 45 and 55? - ANSWER ✅ 68.2% (of the sample will be
within 1 standard deviation of the mean) 50 - 5 = 45 and 50 + 5 + =55
,15.What are the three probabilities of the bell curve? - ANSWER ✅ 68.2%
95.4% 99.7%
16.68.2% of a sample will be within _______ standard deviation of the mean. -
ANSWER ✅ 1
17.95.4% of a sample will be within ______ standard deviations of the mean. -
ANSWER ✅ 2
18.99.7% of a sample will be within _____ standard deviations of the mean. -
ANSWER ✅ 3
19.The mean is 20 and the standard deviation is 2, what is the probability of
being between 14 and 26 - ANSWER ✅ 99.7% (of the sample will be
within 3 standard deviations of the mean) 20 + 2 + 2 + 2 = 26 and 20 - 2 - 2 -
2 = 14
20._______ can be used to differentiate between two samples with the same
mean. - ANSWER ✅ Variation
21.Which measurement can tell us where a single data point is on the bell
curve? - ANSWER ✅ z-score. (Tip: Remember z for me. Where are you in
the curve of your peers)
22.You want to know how your height compares to all of your family tree. How
do you calculate a z score? - ANSWER ✅ (Your height - the mean of the
family tree height) divided by the standard deviation of the family tree
height (me-mean)/standard deviaiton
, 23.You are 63" tall and the family tree averages 67" with a standard deviation
of 2". What is your z-score? - ANSWER ✅ (63-67)/2 = -2 You are 2
standard deviations shorter than the family tree.
24.Which measure lets you measure your height compared to your maternal
family tree and your height compared to your paternal family tree? -
ANSWER ✅ z-scores let us measure two samples by putting them to the
same scale.
25.There are four shopping carts available and one has a broken wheel. What is
your probability of selecting the cart with the broken wheel? - ANSWER ✅
25% (1/4 = 0.25)
26.There is a 20% of parking close to the door and a 30% chance of getting the
shopping cart with a squeaky wheel. How do we calculated the probability
of both events occurring? - ANSWER ✅ Multiply Key Words: AND, ALL,
BOTH
27.There is a 20% of parking close to the door and a 30% chance of getting the
shopping cart with a squeaky wheel. How do we calculated the probability
of either event occurring? - ANSWER ✅ Addition Key Words: OR,
EITHER
28.Multiplying two events calculates an ____________ - ANSWER ✅
Intersection
29.Adding two events calculates a _______________ - ANSWER ✅ Union
