WGU C207 OA
1. A hardware store has found that there is a 0.25 probability that a customer buys an electrical
product, a 0.45 probability that a customer buys a plumbing product, and a 0.10 probability that
a customer buys an electrical part if theypurchase a plumbing part.
Given this information, which statistical rule can be used to determine the probability that a
customer buys a plumbing product given that this customerhas purchased an electrical
product?: Bayes' Theorem
2. Given the following data set:
9 12 14 10 8 11 12
What is the mode?: 12
3. Which graphical tool is used to illustrate a possible relationship or corre-lation between
two variables?: Scatterplot
4. What does it mean when an individual data point has a z-score of -2?: Thedata point is
two standard deviations less than the mean of the data set
5. A research study examined the impact of product advertisement exposureon that product's
brand awareness. The appropriate statistical test indicatesthat the null hypothesis should be
rejected with 95% confidence.
What can be concluded from this study?: The advertisement was effective inbuilding brand
awareness.
6. A manager is analyzing a dataset that includes information on individualincomes. The
manager knows that the dataset is fairly representative of thegeneral population and includes
several millionaires.
Based on this dataset, which measure of central tendency best represents themiddle of the
distribution?: Median
7. After evaluating manufacturing times for a particular product, a manager determines that
the times are spread out across the distribution.The managerhas been asked to determine how
far, on average, the time is from the mean.
, Which statistic roughly measures the average distance of a data point from the mean of the
distribution?: Standard deviation
8. The number of customers that an automobile service shop receives on any given day is
normally distributed with a mean of 75 and a standard deviation of 25. On a given day, 125 oil
changes are performed.
What is the probability on a given day of 125 or fewer oil changes performed?-
: 97.5%
9. A nonprofit organization ran an e-mail campaign with three different mes-sages to solicit
additional donations.
What should the nonprofit organization use to determine if the average dona-tion differs for the
different messages?: ANOVA
10. A manager of a call center is in charge of creating a staffing plan. Thenumber of calls
received per day is normally distributed.
Which two statistics would be needed in order to estimate the number of callsthat would be
received 95% of the time?
Choose 2 answers: Standard deviationMean
11. A hospital gathers the blood pressure readings of a sample of patients. They find that
mean, median and mode of this data set are all nearly equal andthat 50% of the blood pressure
readings are less than the mean and 50% aregreater than the mean.
Which histogram would correctly graph this data set? (hill): picture of a hill
12. A normally distributed data set has a mean of 10 and a standard deviationof 2.
What is the probability that a randomly selected event from the data set willbe between 8 and
12?: 68.2%
13. A manager uses a linear regression to examine how the store's retail salesare predicted by
advertising expenditures.
What will retail sales represent in this regression?: The dependent variable
1. A hardware store has found that there is a 0.25 probability that a customer buys an electrical
product, a 0.45 probability that a customer buys a plumbing product, and a 0.10 probability that
a customer buys an electrical part if theypurchase a plumbing part.
Given this information, which statistical rule can be used to determine the probability that a
customer buys a plumbing product given that this customerhas purchased an electrical
product?: Bayes' Theorem
2. Given the following data set:
9 12 14 10 8 11 12
What is the mode?: 12
3. Which graphical tool is used to illustrate a possible relationship or corre-lation between
two variables?: Scatterplot
4. What does it mean when an individual data point has a z-score of -2?: Thedata point is
two standard deviations less than the mean of the data set
5. A research study examined the impact of product advertisement exposureon that product's
brand awareness. The appropriate statistical test indicatesthat the null hypothesis should be
rejected with 95% confidence.
What can be concluded from this study?: The advertisement was effective inbuilding brand
awareness.
6. A manager is analyzing a dataset that includes information on individualincomes. The
manager knows that the dataset is fairly representative of thegeneral population and includes
several millionaires.
Based on this dataset, which measure of central tendency best represents themiddle of the
distribution?: Median
7. After evaluating manufacturing times for a particular product, a manager determines that
the times are spread out across the distribution.The managerhas been asked to determine how
far, on average, the time is from the mean.
, Which statistic roughly measures the average distance of a data point from the mean of the
distribution?: Standard deviation
8. The number of customers that an automobile service shop receives on any given day is
normally distributed with a mean of 75 and a standard deviation of 25. On a given day, 125 oil
changes are performed.
What is the probability on a given day of 125 or fewer oil changes performed?-
: 97.5%
9. A nonprofit organization ran an e-mail campaign with three different mes-sages to solicit
additional donations.
What should the nonprofit organization use to determine if the average dona-tion differs for the
different messages?: ANOVA
10. A manager of a call center is in charge of creating a staffing plan. Thenumber of calls
received per day is normally distributed.
Which two statistics would be needed in order to estimate the number of callsthat would be
received 95% of the time?
Choose 2 answers: Standard deviationMean
11. A hospital gathers the blood pressure readings of a sample of patients. They find that
mean, median and mode of this data set are all nearly equal andthat 50% of the blood pressure
readings are less than the mean and 50% aregreater than the mean.
Which histogram would correctly graph this data set? (hill): picture of a hill
12. A normally distributed data set has a mean of 10 and a standard deviationof 2.
What is the probability that a randomly selected event from the data set willbe between 8 and
12?: 68.2%
13. A manager uses a linear regression to examine how the store's retail salesare predicted by
advertising expenditures.
What will retail sales represent in this regression?: The dependent variable
