C207 WGU OA multi choice questions

C207 WGU OA multi choice questions

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than :045. The Chi-Square test statistic has a value of 78.0

(greater than the table value of critical chi-square for the F). What does your analysis show?A - Not enough data was used B - p is significant C - p is NOT significant D - p is borderline B - p is significant • P-value less than 0.05 and high Chi-square stat • Over 5 data points counted each day Question - You conduct a trend analysis. You find that R- square is over 0.8 and p-value is 0.023. What does your analysis show? You had 3 years of monthly incidence rates.A - High R-square is good fit and low p is significant B - Not enough data was used C - High R-square is good fit but p is NOT significant D - R-square is Not a good fit but low p is significant A - High R-square is good fit and low p is significant •P-value less than 0.05 • R-square greater than 0.5 • Over 30+ data points

Question - Part of our success was the new point of sale system. Our customer sales representatives were trained in utilizing the system to data mine and apply new marketing techniques. They had to pass their final exam with a 90% or higher. What type of test is this?A - Criterion referenced B - Six Sigma C - Test-Retest D - Norm referenced A - Criterion referenced

Key words: pass, 90% or higher

Question - An Organization seeks to shift its business strategy to development of new products for the future while still growing sales of its current products. Which tool could help the company focus on both its financial objective and growth of new products?A - Net Promoter Score B - Six Sigma C - Results Based Management D - Balanced Scorecard D - Balanced Scorecard

Key words: strategy, focus on both, financial, growth

Question - There is an 70 percent chance of rain.When it rains, there is a 10 percent chance of Todd walking to the store and there is also a 15 percent chance of Todd having an umbrella. It is raining today. What probability principle will determine if Todd will at least have his umbrella today?A - Multiplication B - Addition C - Bayes D - Combination B - Addition

• There are two possibilities: walking

OR umbrella . "At least one of these" means one OR the Other • Use Addition Question - There is an 70 percent chance of rain.When it rains, there is a 10 percent chance of Todd walking to the store. On days that it doesn't rain, there is a 60 percent chance of Todd walking to the store. What is the ilkelihood that it will not rain today and Todd will walk to the store?

A - 18%

B - 12%

C - 42%

D-7%

A - 18%

% always = 100 100 - 70 rain = 30 no rain • Chance of no rain = 30% • Chance of walking = 60% • Keyword is AND • Multiply for chance of BOTH

• 30% × 60% = 18%

Question - Mr. Wonka notices that the last twenty times he invented a new chocolate candy, his major competitors, Count Chocula, and the Easter Bunny, have big sales in late October. Mr. Wonka feels directly responsible for the profit of his competitors.What is the flaw in this experiment?A - Small Sample Size B - Double blinding C - Association vs. Causation D - Response bias C - Association vs. Causation

Key words: directly responsible

• Assuming causality is one of the biggest misuse of analysis; it usually requires lots and lots of testing to conclude a cause!!Question - If you came in first, second, or third in a race, this would be an example of a type of data. Rankings are an example of which kind of data?A - Nominal B - Continuous C - Discrete D - Ordinal D - Ordinal • Nominal - names • Ordinal - order • Interval - equal distance • Ratio - Unique zero point Question - Is there a trend in the incidence of child abuse in a particular State? 2 years of monthly incidence rates of child abuse A - Paired sample t-test B - Time series trend analysis C - Chi-square D - Logistic regression B - Time series trend analysis

Key wards: trend, monthly, rates

• Time Series is an approach that usually requires regression to see the relationship over time as a trend Question - Is there a relationship between number of training hours for counselors and number of patient incidents requiring physical restraint? Staff training hours and 3 years of monthly incidence data.A - Regression

B - ANOVA

C - Multiple Regression D - Chi-square A - Regression

Key words: relationship, hours, indicates

• If you see a 3, do not just assume that it is about ANOVA • This is the relationship between one X and one Y Question - Are there differences in average police salaries across 3 adjoining precincts? Annual salaries of individual police officers from 3 precincts A - paired sample t-test

B - ANOVA

C - multiple regression D - chi-square

B - ANOVA

Key words: salaries, 3 precincts

Question - Are there differences in police staffing across

• adjoining precincts? Staffing of individual police

officers from 3 precincts A - paired sample t-test

B -ANOVA

C - multiple regression D - chi-square D - chi-square

Key word: staffing

• Did you NOTICE the wording changed??

• STAFFING IS HEADCOUNT!!

•IF WE ARE COUNTING, THAT IS A FREQUENCY - We CAN'T use ANOVA

• WE NEED CHI-SQUARE

• PAY ATTENTION SINCE CHANGING ONE WORD HAS CHANGED THE

ANSWER!

Question - You own a Yoga Studio. You want to look at donation amount, driving distance, and zip code to predict impact on donations.A - Multiple Regression B - Paired sample t-test C - Decision Tree D - Time Series A - Multiple Regression

Key word: predict

Question - You are an HR manager.You need to determine the differences in effectiveness rating for new and old employee incentive plans?A - Paired sample t-test B - Linear regression C - Multiple Regression D - simple t test A - Paired sample t-test

Key words: differences, new and old

•Did you immediately eliminate REGRESSION Analytics since this is about differences?• Did you see that new and old are likely paired?A car mechanic finds out that the amount spent by customers has an average of $200 and standard deviation $30. What is the probability that the next customer will spend between $110 and $290 (assume normal distribution)?

A - 68.3%

B - 95.4%

C - 99.7%

D - 100%

C - 99.7%

Use Z score According to The Empirical Rule, approximately 68.3% of the data points in a dataset will be within 1 standard deviation of the mean.Approximately 95.4% of the data points in a dataset will be within 2 standard deviations of the mean.And almost all 99.7% of the data points in a dataset will be within 3 standard deviations Two general categories of analysis techniques... 1.Statistical Analyses (i.e., Inferential Statistics) Statistical Analyses •Goal is to make an inference about a larger population based on analysis of a smaller sample •Is there a statistically significant finding (trend, group difference, etc.)?•e.g., regression, t-test, ANOVA Two general categories of analysis techniques... 2.Decision Science Decision Science •Analytics to derive an optimal solution/decision •e.g., linear programming, break-even analysis, simulation