Page 1 of 43
1
WGU C207 DATA DRIVEN DECISION -MAKING FINAL
EXAM LATEST ACTUAL EXAM WITH 350 EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) A+GRADE
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 at the 5% significance level.What can be concluded from this study?
The advertisement was effective in increasing sales.The advertisement was effective in building brand awareness.Five percent of the subjects did not like the advertisement.Ninety-five percent of the subjects liked the brand. - ANSWER-The advertisement was effective in building brand awareness.
A manager analyzes a data set that includes information on individual incomes. The manager knows that the data set is fairly representative of the general population and includes several millionaires.Based on this data set, which measure of central tendency best represents the middle of the distribution?
Mean Median Frequency Mode - ANSWER-Mean
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 1 / 4
Page 2 of 43
2 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?
Median Standard deviation Mode Arithmetic mean - ANSWER-Standard deviation
A nonprofit organization ran an email campaign with three different messages to solicit additional donations.What should the nonprofit organization use to determine if the average donation differs for the different messages?
T-test Mean ANOVA Median - ANSWER-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 to estimate the number of calls that would be received 95% of the time?Choose 2 answers.
Standard deviation Mean Median Interquartile range - ANSWER-Standard deviation 2 / 4
Page 3 of 43
3 Mean
A manager uses a linear regression to examine how the store's retail sales are predicted by advertising expenditures.Which type of variable do retail sales represent in this regression?
Independent variable Dependent variable Control variable Predictor variable - ANSWER-Dependent variable
An analyst used multiple linear regression to explore how Store A's sales ( y) are predicted by Store A's advertising expenditure dollars (variable x1) and the advertising expenditure dollars of Store A's competitor (variable x2).The estimated regression is y = 532 + 80.5 x1 - 35.6 x2.How much sales would be predicted if x1 is $1,000 and x2 is also $1,000?
$45,432
$116,632
$44,900
$44,367 - ANSWER-$45,432
A company decides to auction excess inventory on an auction website. The company has performed a regression analysis to identify how the length of the auction impacts the final price.Which statistic indicates the strength of the relationship between the length of the auction and final price? 3 / 4
Page 4 of 43
4
R-squared Z-score P-value F-statistic - ANSWER-R-squared
A researcher looks at moving average data on store sales and wishes to perform a multiple regression of interest rates and disposable income.
What is a particular concern when performing time series multiple regression?
Multicollinearity Heteroscedasticity Homoscedasticity Autocorrelation - ANSWER-Autocorrelation
A retail store notices a spike in turkey sales every November.Which time series pattern are turkey sales likely to exhibit?
Trend Cyclical Seasonal White noise - ANSWER-Seasonal
- / 4