WGU C207 DATA DRIVEN
DECISION MAKING TESTBANK
WITH ALL 290 CORRECT
ANSWERS
If the mean is 50 and the standard deviation is 5, what is the probability of
being between 45 and 55?
68.2%
What are the three probabilites of a bell curve?
68.2, 95.4, 99.7
68.2 of a sample will be withing ____ standard deviation of the mean
1
95.4% of a sample will be within ______ standard deviations of the mean.
2
99.7% of a sample will be within _____ standard deviations of the mean.
3
,The mean is 20 and the standard deviation is 2, what is the probability of
being between 14 and 26
99.7
_________ can be used to differentiate between two sample with the same
mean.
variation
which measurement can tell us where a single data point is on the bell curve
z-score
You want to know how your height compares to all of your family tree. How
do you calculate a z score?
me-mean/standard deviation
You are 63" tall and the family tree averages 67" with a standard deviation of
2". What is your z-score?
(63-67)/2 = -2, you are to standard deviations shorter than the family tree
Which measure lets you measure your height compared to your maternal
family tree and your height compared to your paternal family tree?
z-scores let us measure two samples by putting them to the same scale
,There are four shopping carts available. What is your probability of selecting
the care with the broken wheel
1/4 or 25%
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?
multiply
There is a 20% chance of parking close to the door and a 30% chance of
getting the shopping cart with the broken wheel. How to we calculate the
probability of either even occurring?
addition
multiplying two events calculates an
intersection
Adding two events calculates a _______________
union
The grocer is running a 10 for $10 special on cans of soup. You can mix and
match the 5 different flavors of soup. You decide to purchase 10 cans. What
can we use to count all the possible outcomes of flavors picked?
, combination
There is a 90% chance you will have to wait in line for more than 6 minutes
to check out at the grocer. What is the complement?
10% chance you will wait less than 6 minutes
50% chance it will rain. There is a 20% chance you park in the garage in the
rain and a 60% chance you park there if it is not raining. Given you are
parked in the garage, what is the probability it is raining? Which probability
technique applies?
Bayes
You conduct a quick survey asking friends to rate your new website on a
scale of 1 - 10. Which graph will show how the responses are distributed
Histogram. Keyword: Distribution (How many people answered 1, 2, 3......
NOTE: The histogram is a bar chart
You have the number of customers that visit your website by clicking on a
promotion email. Which graph can show you if sales are correlated to the
number of promotional emails each week?
Scatter Diagram
A relationship is stronger when r is closer to what number?
1
DECISION MAKING TESTBANK
WITH ALL 290 CORRECT
ANSWERS
If the mean is 50 and the standard deviation is 5, what is the probability of
being between 45 and 55?
68.2%
What are the three probabilites of a bell curve?
68.2, 95.4, 99.7
68.2 of a sample will be withing ____ standard deviation of the mean
1
95.4% of a sample will be within ______ standard deviations of the mean.
2
99.7% of a sample will be within _____ standard deviations of the mean.
3
,The mean is 20 and the standard deviation is 2, what is the probability of
being between 14 and 26
99.7
_________ can be used to differentiate between two sample with the same
mean.
variation
which measurement can tell us where a single data point is on the bell curve
z-score
You want to know how your height compares to all of your family tree. How
do you calculate a z score?
me-mean/standard deviation
You are 63" tall and the family tree averages 67" with a standard deviation of
2". What is your z-score?
(63-67)/2 = -2, you are to standard deviations shorter than the family tree
Which measure lets you measure your height compared to your maternal
family tree and your height compared to your paternal family tree?
z-scores let us measure two samples by putting them to the same scale
,There are four shopping carts available. What is your probability of selecting
the care with the broken wheel
1/4 or 25%
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?
multiply
There is a 20% chance of parking close to the door and a 30% chance of
getting the shopping cart with the broken wheel. How to we calculate the
probability of either even occurring?
addition
multiplying two events calculates an
intersection
Adding two events calculates a _______________
union
The grocer is running a 10 for $10 special on cans of soup. You can mix and
match the 5 different flavors of soup. You decide to purchase 10 cans. What
can we use to count all the possible outcomes of flavors picked?
, combination
There is a 90% chance you will have to wait in line for more than 6 minutes
to check out at the grocer. What is the complement?
10% chance you will wait less than 6 minutes
50% chance it will rain. There is a 20% chance you park in the garage in the
rain and a 60% chance you park there if it is not raining. Given you are
parked in the garage, what is the probability it is raining? Which probability
technique applies?
Bayes
You conduct a quick survey asking friends to rate your new website on a
scale of 1 - 10. Which graph will show how the responses are distributed
Histogram. Keyword: Distribution (How many people answered 1, 2, 3......
NOTE: The histogram is a bar chart
You have the number of customers that visit your website by clicking on a
promotion email. Which graph can show you if sales are correlated to the
number of promotional emails each week?
Scatter Diagram
A relationship is stronger when r is closer to what number?
1
