WGU C207 Data Driven Decision Making Quizzes Verified Solutions

WGU C207 Data Driven Decision Making Quizzes Verified Solutions (Quiz 1) 1. For companies to attract and retain their best customers they need a complete portrait of who they are. To develop this portrait companies turn to... A) Statistics B) Analytics C) Management Science D) Histograms B (Quiz 1) 2. A manufacturer wants to maximize their factory output while specifically minimizing labor costs. What type of analytics might they employ to achieve this goal? A) Descriptive Analytics B) Predictive Analytics C) Prescriptive Analytics D) Diagnostic Analytics C 00:0201:41 (Quiz 1) 3. What type of data error that occurs in measurement is constant within a data set and is sometimes caused by faulty equipment or bias? A) Random B) Omission C) Outlier D) Systematic D (Quiz 1) 4. An Educator develops a new standardized test to measure math skills of ninth graders. She has students in her home state of Ohio take the test. If the test is to be used on a national level, what type of error might be found in her data? A) Omission Error B) Systematic Error C) Measurement Bias D) Information Bias C (Quiz 1) 5. A city government is trying to determine the national origins of its recent immigrant population. If a survey of the immigrant population is conducted in English what type of error might be present in the data? A) Random B) Omission C) Outlier D) Accuracy B (Quiz 1) 6. The use of Big Data is increasingly important to businesses in competitive markets. Which of the following characteristics is NOT true of big data? A) Requires the use of analytics B) Contains structured data C) Contains unstructured data D) Can be analyzed with traditional spreadsheets D (Quiz 1) 7. The Davenport-Kim three-stage model consists of framing the problem, solving the problem, and communicating results. Which two of the following are part of framing the problem stage? A) Determine the scope of the problem B) Data collection C) Review of previous findings D) Presenting a recommendation A & C (Quiz 1) 8. A healthcare provider is researching blood glucose levels before and after exercising. What two elements should be part of any experimental study such as this? A) Treatment procedures B) Patient observation C) Statistical validity D) Experimental response A & D (Quiz 1) 9. Runners cover 26.2 miles in the Olympics marathon. What level of measurement is this? A) Nominal B) Ordinal C) Interval D) Ratio D (Quiz 1) 10. What level of measurement is the type of cars produced in Ford factory? A) Nominal B) Ordinal C) Interval D) Ratio A (Quiz 1) 11. What level of measurement is this the 10 best cities in the U.S. to retire in? A) Nominal B) Ordinal C) Interval D) Ratio B (Quiz 1) 12. What level of measurement are women's dress sizes (2,4,6, etc.)? A) Nominal B) Ordinal C) Interval D) Ratio C (Quiz 1) 13. A local school board is studying the impact of a proposed change in testing on math scores. Bias can be introduced into the study by both students and teachers. Which research technique would eliminate this type of bias? A) Observation study B) Blind study C) Cohort study D) Double blind study D (Quiz 1) 14. A Company's product development team test 3 new car waxes by waxing 5 cars with each wax and then running them through a car wash. They then record number of washes it takes before the wax begins to deteriorate. What is the term for the five cars? A) The response B) The construct validity C) The experimental unit D) The treatment C (Quiz 2) 1. An online retailer selling workout apparel has a large increase in sales during December and declares that their weekly newspaper ad resulted in higher sales. What misuse of statistics may the retailer have used in making this decision? A) Conscious Bias B) Missing Data C) Association and Causation D) Small Sample Size C (Quiz 2) 2. An educator collects eighth grade math scores from a local school and used this data to recommend curriculum changes for grades 8 - 12. What misuse of statistics may the educator have used in making this recommendation? A) Not a representative sample B) Conscious Bias C) Lack of Binding D) Missing Data A (Quiz 2) 3. An economist wishes to study the distribution of household income in a Midwestern city. He randomly selects a sample from 12 households. He notices two large incomes in his sample. Which measure best represents the middle of the incomes? A) Mode B) Median C) Variance D) Mean B (Quiz 2) 4. A cable company offers its customers both cable television and internet. What statistical rule should be used to determine the probability that customers will have both cable television and internet? A) Multiplication B) Bayes Theorem C) Combination D) Addition A (Quiz 2) 5. A department store is considering a new credit policy to reduce defaults on payments. Its records show that 95% of defaults have at least 2 late payments. Also, 3% of all customers default and 30% of those customers who have not defaulted have a least 2 late payments. What statistical rule should be used to find the probability that a customer will default given that at least 2 payments were late? A) Central Limit Theorem B) Multiplication Rule C) Bayes Theorem D) Combination Rule C (Quiz 2) 6. Based on quality checks at plastic bags manufacturer, the breaking strength of their bags has a mean of 50.5 and a standard deviation of 1.6. A customer's test of the bags finds bag strength of 54.2 or less. Which statistical measure should be used to help determine the probability of the customer's test occurring? A) t-test B) z-score C) p-value D) R-Square B (Quiz 2) 7. The mean of 100 bank customers' waiting times for teller service is 5.8 minutes with a standard deviation of 1.5. What time range would represent a 95.4% probability customer waiting time? A) 4.3 to 7.3 B) 2.8 to 8.8 C) 1.3 to 13.0 D) 3.8 to 7.5 B (Quiz 2) 8. The revenue of NBA teams ranges from $226 million for the New York Knicks to $92 million for the Milwaukee Bucks. Which statistic would measure how far each NBA team's revenue is from the NBA revenue mean? A) Z-score B) Mode C) Median D) Variance D (Quiz 2) 9. A local plumbing company is analyzing to see how the number weeks taken for their payment receipts is distributed. Which graphical analysis technique should they use? A) Scatterplot B) Pie Chart C) Histogram D) Box Plot C (Quiz 2) 10. Given the following data set:60, 41, 30, 15, 34, 30 What is the Median? A) 32 B) 30 C) 34 D) 35 A (Quiz 2) 11. A loan officer compares the interest rates for 48 month fixed-rate loans and 48 month variable-rate auto loans. Two independent, random samples of auto loans are selected. Which two results happen when the null hypothesis is rejected using a t-test? (Pick 2) A) The test statistic is less than the critical value B) The null hypothesis is rejected given a probability of being wrong C) The test statistic is greater than the critical value D) The null hypothesis is accepted given a probability of being correct. B & C (Quiz 2) 12. An online marketing organization designed a social media that wants to earn at least $250,000 in revenue. The campaign will reach 10,000 viewers and receive orders with a mean of $50 and standard deviation of $10. Which measure should be used to determine the probability of the campaign receiving at least $250,000? A) T-statistic B) Z-score C) Median D) R-squared B (Quiz 2) 13. What does it mean when an individual data point has a z-s