Question

A company has developed a new computer sound card whose average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The 5 years represents a:
Select one:
A. sample
B. parameter
C. population
D. statistic

Answer 1

Solution:

Given: In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years.

A quantitative characteristic of sample is called statistic, for example sample mean , sample variance etc.

A quantitative characteristic of population is called parameter. for example population mean , population variance.

Since average lifetime is 5 years is from sample of 200 , that is it is a sample mean. thus this is a statistic.

Thus correct answer is: D. statistic