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WGU C955 - Module 5: Descriptive Statistics for Two Variables Exam/60 Q’s and A’s
WGU C955 - Module 5: Descriptive Statistics for Two Variables Exam/60 Q’s and A’s
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WGU C955 - Module 5: DescriptiveStatistics for Two Variables Exam/60 Q’s
and A’s
The relationship between the two variables on a scatterplot can be measured
by what statistic?
{{ Scatterplot of sales on the x-axis and profit index on the y-axis. }}
a Correlation coefficient ( r )
b Regression
c ANOVA
d Chi-square - -Correlation coefficient ( r )
-A study was completed to investigate if commutes of longer than 30
minutes increased the risk of burnout. The results of the study are in the
table below.
,Lenth of Commute ,<30 Minutes ,>30 Minutes ,Total
Risk of Burnout ,Negative for Burnout ,185 ,72 ,257
,Positive for Burnout ,98 ,247 ,345
,Total ,283 ,319 ,602
What percentage of commuters with commutes greater than 30 minutes
expressed being burned out?
a 66.39%
b 77.43%
c 81.62%
d 70.74% - -77.43%
-Describe the relationship of the two variables on the scatterplot.
{{ Scatterplot displaying data points with advertising dollars on the x-axis
and units sold on the y-axis. The data points are tightly clustered in a pattern
that slopes upward from right to left in a non-linear fashion. }}
a Weak negative
b Strong negative
c Weak/No relationship
d Non-linear/Curved relationship - -Non-linear/Curved relationship
-What percentage of connections using Service Provider A were suspicious?
Web Hosting Service
, Service Provider A Service Provider B Total
Web Server Safe Connections 87 14 101
Suspicious Connections 37 89 126
Total 124 103 227
a 13.6%
b 29.8%
c 70.2%
d 86.4% - -29.8%
-Out of the total number of connections, what percentage of safe
connections were reported by Service Provider A?
Web Hosting Service
Service Provider A Service Provider B Total
Web Server Safe Connections 87 14 101
Suspicious Connections 37 89 126
Total 124 103 227
a 6.2%
b 16.3%
c 38.3%
d 39.2% - -38.3%
-In the side-by-side box plot below, gender represents what type of variable?
{{ Side by side box plots comparing the hourly wages of both males and
females. Gender is on the y-axis }}
a Quantitative variable
b Response variable
c Controlled variable
d Categorical variable - -Categorical variable
-What percentage of the students who took the eight-week online course
were unsuccessful in passing the certification exam?
Successful Unsuccessful Total
Eight Week Online Certification Course 118 26 144
Self-directed Certification Study Program 42 14 56
Total 160 40 200
a 7.3%
b 18.1%
c 20%
d 25.6% - -18%
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