BUS 475 Week 4 Knowledge Check

1. A fast-food restaurant asks customers to evaluate the drive-thru service as good, average, or poor. What level of data measurement is this classification?

• Nominal

• Ordinal

• Interval

• Ratio

2. In order to determine the average amount spent in November on Amazon.com a random sample of 144 Amazon accounts were selected. The sample mean amount spent in November was $250 with a standard deviation of $25. Assuming that the population standard deviation is unknown, what is a 95% confidence interval for the population mean amount spent on Amazon.com in November?

• ($245.88, $254.12)

• ($247.47, $260.09)

• ($250.64, $256.92)

• ($251.34, $256.22)

Complete Answers here BUS 475 Week 4 Knowledge Check

3. A shipment of 20 DVDs has arrived at a video rental store. Based on past experience, the manager knows that 10% of all new DVDs sent to the store have a visible defect. The manager tells you to begin inspecting the new DVDs one at a time at random until you find the first DVD that has a defect. If 10% of the DVDs have a visible defect in the new shipment, what is the probability that the first DVD that has a defect is the 3rd one that you inspect? (Round your answer to 3 decimal places.)

• .081

• .268

• .089

• .716

4. An insurance agent has selected a sample of drivers that she insures whose ages are in the range from 16–42 years old. For each driver, she records the age of the driver and the dollar amount of claims that the driver filed in the previous 12 months. A scatterplot showing the dollar amount of claims as the response variable and the age as the predictor shows a linear regression line with: y^=3710 – 55.4x. If the age of a driver increases by 1 year, by how much and in what direction would the dollar amount of claims be predicted to change for the driver?

• Increase by 55.4 dollars

• Decrease by 55.4 dollars

• Increase by 3710 dollars

• Increase by...