1. What level of measurement are the Centigrade and Fahrenheit temperature scales?
Nominal
Ordinal
Interval
Ratio
2. What is the relationship between the variance and the standard deviation?
Variance is the square root of the standard deviation
Variance is the square of the standard deviation
Variance is twice the standard deviation
No constant relationship between the variance and the standard deviation
3. The U.S. Department of Education reported that for the past seven years 4,033, 5,652, 6,407, 7,201, 8,719, 11,154, and 15,121 people received bachelor's degrees in computer and information sciences. What is the annual arithmetic mean number of degrees awarded?
About 12,240
About 8,327
About 6,217
About 15,962
4. A purchasing agent for a trucking company is shopping for replacement tires for their trucks from two suppliers. The suppliers' prices are the same. However, Supplier A's tires have an average life of 60,000 miles with a standard deviation of 10,000 miles. Supplier B's tires have an average life of 60,000 miles with a standard deviation of 2,000 miles.
Which of the following statements is true?
The two distributions of tire life are the same
On average, Supplier A's tires have a longer life then Supplier B's tires
The life of Supplier B's tire is more predictable than the life of Supplier A's tires
The dispersion of Supplier A's tire life is less than the dispersion of Supplier B's tire life