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Chapter 1: Q13BSC (page 1)

Statistical Significance and Practical Significance. In Exercises 13鈥�16, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.

Diet and Exercise Program In a study of the Kingman diet and exercise program, 40 subjects lost an average of 22 pounds. There is about a 1% chance of getting such results with a program that has no effect

Short Answer

Expert verified

The results seem to have both statistical and practical significance.

Step by step solution

01

Given information

The number of subjects in the study who lost an average of 22 pounds weight through the Kingsman diet and exercise program is 40.

The chance of obtaining results with a program known to have no effect is 1%.

02

Explanation for statistical and practical significance

Statistical significance is the chance of rejecting the base hypothesis assuming that it is true. Practical significance is determined using effect size, whichdescribes the practical meaningfulness of the result.

03

Statistical significance

As the chance of obtaining the result that a person has lost an average weight of 22 pounds is 1%, it can be interpreted that the result is highly unlikely to appear.

Thus, the results show that there appears to be a statistical significance.

04

Practical significance

As 22 pounds is known to have been lost through the diet and exercise, the result declares that the exercise program and diet are useful in practical situations.

Thus, the results show that there appears to be a practical significance.

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Most popular questions from this chapter

Statistical Significance and Practical Significance. In Exercises 13鈥�16, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.

Diet and Exercise Program In a study of the Kingman diet and exercise program, 40 subjects lost an average of 22 pounds. There is about a 1% chance of getting such results with a program that has no effect

Health SurveyIn a survey of 1020 adults in the United States, 44% said that they wash their hands after riding public transportation (based on data from KRC Research).

a. Identify the sample and population.

b. Is the value of 44% a statistic or parameter?

c. What is the level of measurement of the value of 44%? (nominal, ordinal, interval, ratio)

d. Are the numbers of subjects in such surveys discrete or continuous?

In Exercises 21鈥�24, refer to the data in the table below. The entries are white blood cell counts (1000 cells,ML) and red blood cell counts (million cells,ML) from male subjects examined as part of a large health study conducted by the National Center for Health Statistics. The data are matched, so that the first subject has a white blood cell count of 8.7 and a red blood cell count of 4.91, and so on.

Subject


12345
White8.75.97.36.25.9
Red4.915.594.444.85.17

Context Given that the data are matched and considering the units of the data, does it make sense to use the difference between each white blood cell count and the corresponding red blood cell count? Why or why not?

Identify whether the given value is a statistic or a parameter.

Birth Genders In the same study cited in the preceding exercise, 51% of the babies were girls.

Determine whether the given source has the potential to create a bias in a statistical study.

Chocolate: An article in the Journal of Nutrition (Vol. 130, No. 8) noted that chocolate is rich in flavonoids. The article notes 鈥渞egular consumption of foods rich in flavonoids may reduce the risk of coronary heart disease.鈥� The study received funding from Mars, Inc., the candy company, and the Chocolate Manufacturers Association.
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