Questions from Business Statistics

Q: Is there an association between time of year and the nighttime temperature

Is there an association between time of year and the nighttime temperature in North Dakota? A researcher assigned the numbers 1365 to the days January 1 December 31 and recorded the temperature at 2:0...

Q: In Exercise 22, we examined the percentage of men aged 1824

In Exercise 22, we examined the percentage of men aged 1824 who smoked from 1965 to 2014 according to the Centers for Disease Control and Prevention. How about women? Here a scatterplot showing the co...

Q: The scatterplot below shows the number of passengers at Oakland (CA

The scatterplot below shows the number of passengers at Oakland (CA) airport month by month since 1997 (oaklandairport.com/news/statistics/passenger-history/). 1. Describe the patterns in passengers a...

Q: In Chapter 6, we saw data on the errors (in

In Chapter 6, we saw data on the errors (in nautical miles) made by the National Hurricane Center in predicting the path of hurricanes. The scatterplot below shows the trend in the 24-hour tracking er...

Q: Each of these four scatterplots shows a cluster of points and one

Each of these four scatterplots shows a cluster of points and one stray point. For each, answer these questions: 1. In what way is the point unusual? Does it have high leverage, a large residual, or b...

Q: Each of the following scatterplots shows a cluster of points and one

Each of the following scatterplots shows a cluster of points and one stray point. For each, answer these questions: 1. In what way is the point unusual? Does it have high leverage, a large residual, o...

Q: The scatterplot shows five blue data points at the left. Not

The scatterplot shows five blue data points at the left. Not surprisingly, the correlation for these points is r=0. Suppose one additional data point is added at one of the five positions suggested be...

Q: The original five points in Exercise 33 produce a regression line with

The original five points in Exercise 33 produce a regression line with slope 0. Match each of the red points (ae) with the slope of the line after that one point is added: 1. 0.45 2. 0.30 3. 0.00 4. 0...

Q: Suppose a researcher studying health issues measures blood pressure and the percentage

Suppose a researcher studying health issues measures blood pressure and the percentage of body fat for several adult males and finds a strong positive association. Describe three different possible ca...

Q: A researcher studying violent behavior in elementary school children asks the children

A researcher studying violent behavior in elementary school children asks the children parents how much time each child spends playing computer games and has their teachers rate each child on the leve...