Questions from Business Statistics

Q: Which of the following scenarios should be analyzed as paired data?

Which of the following scenarios should be analyzed as paired data? 1. Spouses are asked about the number of hours of sleep they get each night. We want to see if husbands get more sleep than wives. 2...

Q: We have data on the city and highway fuel efficiency of 633

We have data on the city and highway fuel efficiency of 633 cars and trucks. 1. Would it be appropriate to use paired t methods to compare the city fuel efficiency of the cars and the trucks? 2. Would...

Q: The calibration test for a new weight-in-motion method

The calibration test for a new weight-in-motion method of weighing trucks was introduced in Chapter 6, exercise 52 . Is this method consistent with the traditional method of static weighing? Are the c...

Q: In Exercise 3, after deleting an outlying value of –

In Exercise 3, after deleting an outlying value of –27, the mean difference in fuel efficiencies for the 632 vehicles was 7.37 mpg with a standard deviation of 2.52 mpg. Find a 95% confidence interv...

Q: Find a 98% confidence interval of the weight differences in Exercise

Find a 98% confidence interval of the weight differences in Exercise 4 . Interpret this interval in context.

Q: Thinking about the data on fuel efficiency in Exercise 3 , why

Thinking about the data on fuel efficiency in Exercise 3 , why is the blocking accomplished by a matched pairs analysis particularly important for a sample that has both cars and trucks?

Q: Consider the weights from Exercise 4. The side-by-

Consider the weights from Exercise 4. The side-by-side boxplots below show little difference between the two groups. Should this be sufficient to draw a conclusion about the accuracy of the weigh-in-m...

Q: If there is no seasonal effect on human births, we would

If there is no seasonal effect on human births, we would expect equal numbers of children to be born in each season (winter, spring, summer, and fall). A student takes a census of her statistics class...

Q: Three statistics classes all took the same test. Histograms and boxplots

Three statistics classes all took the same test. Histograms and boxplots of the scores for each class are shown below. Match each class with the corresponding boxplot.

Q: The Iliad also reports the cause of many injuries. Here is

The Iliad also reports the cause of many injuries. Here is a table summarizing those reports for the 152 injuries for which the Iliad provides that information. Is there an association? 1. Under the n...