9 12 14 10 8 11 12 - product, a 0.45 probability that a customer buy...

WGU C207 OA

• 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 they purchase 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 customer has purchased an electrical

product?: Bayes' Theorem

2. Given the following data set:

9 12 14 10 8 11 12

What is the mode?: 12

• Which graphical tool is used to illustrate a possible relationship or corre- lation between

two variables?: Scatterplot

• What does it mean when an individual data point has a z-score of -2?: The data point is

two standard deviations less than the mean of the data set

• A research study examined the impact of product advertisement exposure on that product's

brand awareness. The appropriate statistical test indicates that the null hypothesis should be rejected with 95% confidence.

What can be concluded from this study?: The advertisement was effective in building brand awareness.

• A manager is analyzing a dataset that includes information on individual incomes. The

manager knows that the dataset is fairly representative of the general population and includes several millionaires.

Based on this dataset, which measure of central tendency best represents the middle of the

distribution?: Median

• After evaluating manufacturing times for a particular product, a manager determines that

the times are spread out across the distribution. The manager has been asked to determine how far, on average, the time is from the mean.

• / 2

Which statistic roughly measures the average distance of a data point from the mean of the

distribution?: Standard deviation

• 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%

• 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

• A manager of a call center is in charge of creating a staffing plan. The number of calls

received per day is normally distributed.

Which two statistics would be needed in order to estimate the number of calls that would be received 95% of the time?

Choose 2 answers: Standard deviation Mean

• 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 and that 50% of the blood pressure readings are less than the mean and 50% are greater than the mean.

Which histogram would correctly graph this data set? (hill): picture of a hill

• A normally distributed data set has a mean of 10 and a standard deviation of 2.

What is the probability that a randomly selected event from the data set will be between 8 and

12?: 68.2%

• A manager uses a linear regression to examine how the store's retail sales are predicted by

advertising expenditures.What will retail sales represent in this regression?: The dependent variable

• / 2