Questions from Business Statistics

Q: Owners of a new coffee shop tracked sales for the first 20

Owners of a new coffee shop tracked sales for the first 20 days and displayed the data in a scatterplot (by day). 1. Make a histogram of the daily sales since the shop has been in business. 2. State o...

Q: For the car speed data in Exercise 30 , here are the

For the car speed data in Exercise 30 , here are the histogram, boxplot, and Normal probability plot of the 100 readings. Do you think it is appropriate to apply a Normal model here? Explain.

Q: Fifty-three men completed the men alpine downhill at the 2018

Fifty-three men completed the men alpine downhill at the 2018 winter Olympics in PyeongChang. The gold medal winner finished in 100.25 seconds. Here are the times (in seconds) for all competitors. 1....

Q: The mean of the 100 car speeds in Exercise 30 was 23

The mean of the 100 car speeds in Exercise 30 was 23.84 mph, with a standard deviation of 3.56 mph. 1. Using a Normal model, what values should border the middle 95% of all car speeds? 2. Here are som...

Q: NFL data from the 2015 football season reported the number of yards

NFL data from the 2015 football season reported the number of yards gained by each of the league 488 receivers: The mean is 274.73 yards, with a standard deviation of 327.32 yards. 1. According to the...

Q: A large philanthropic organization keeps records on the people who have contributed

A large philanthropic organization keeps records on the people who have contributed. In addition to keeping records of past giving, the organization buys demographic data on neighborhoods from the U.S...

Q: The Glassdoor Economic Research Blog published the compensation (in millions of

The Glassdoor Economic Research Blog published the compensation (in millions of dollars) for the CEOs of large companies. The distribution looks like this: The mean CEO compensation is $14.1M and the...

Q: Suppose we take logarithms of the CEO compensations in Exercise 47 .

Suppose we take logarithms of the CEO compensations in Exercise 47 . The histogram of log Compensation looks like this: with a mean of 1.07 and a standard deviation of 0.26. 1. According to the Normal...

Q: Based on the model N(1152,84) describing Angus

Based on the model N(1152,84) describing Angus steer weights from Exercise 29 , what are the cutoff values for 1. the highest 10% of the weights? 2. the lowest 20% of the weights? 3. the middle 40% of...

Q: In the Normal model N(100,15) from Exercise

In the Normal model N(100,15) from Exercise 10 , what cutoff value bounds 1. the highest 5% of all IQs? 2. the lowest 30% of the IQs? 3. the middle 80% of the IQs?