Questions from Business Statistics

Q: People swam across Lake Ontario from Niagara-on-the-

People swam across Lake Ontario from Niagara-on-the-Lake to Toronto (52 km, or about 32.3 mi) 62 times between 1954 and 2016. We might be interested in whether the swimmers are getting any faster or s...

Q: We removed humans from the scatterplot of the Gestation data in Exercise

We removed humans from the scatterplot of the Gestation data in Exercise 45 because our species was an outlier in life expectancy. The resulting scatterplot (below) shows two points that now may be of...

Q: The errors in predicting hurricane tracks (examined in this chapter)

The errors in predicting hurricane tracks (examined in this chapter) were given in nautical miles. A statutory mile is 0.86898 nautical mile. Most people living on the Gulf Coast of the United States...

Q: In Exercise 46, we saw in the Swim the Lake 2016

In Exercise 46, we saw in the Swim the Lake 2016 data that Vicki Keith round-trip swim of Lake Ontario was an obvious outlier among the other one-way times. Here is the new regression after this unusu...

Q: Look again at the graph of the age at first marriage for

Look again at the graph of the age at first marriage for women in Exercise 42. Here is a regression model for the data on women, along with a residuals plot: Response variable is: Women R-squared = 61...

Q: In Chapter 7, we There is found a relationship between the

In Chapter 7, we There is found a relationship between the age of a bridge in Tompkins County, New York, and its condition as found by inspection. (Data in Tompkins County Bridges 2016) But we conside...

Q: The World Bank reports many demographic statistics about countries of the world

The World Bank reports many demographic statistics about countries of the world. The data file holds the Fertility rate (births per woman) and the female Life Expectancy at birth (in years) for 200 co...

Q: We met the Tour de France dataset in Chapter 1 (in

We met the Tour de France dataset in Chapter 1 (in Just Checking). Look at the Tour de France dataset. One hundred years ago, the fastest rider finished the course at an average speed of about 25.3 kp...

Q: The Consumer Price Index (CPI) tracks the prices of consumer

The Consumer Price Index (CPI) tracks the prices of consumer goods in the United States, as shown in the following table. The CPI is reported monthly, but we can look at selected values. The table sho...

Q: Look once more at the data from Tour de France 2016.

Look once more at the data from Tour de France 2016. In Exercise 52, we looked at the whole history of the race, but now let consider just the modern era from 1967 on. 1. Make a scatterplot and find t...