A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and finds a mean of 53 with a standard deviation of 12.
11. Which of the following is a statistic?
a. 50
b. 53
c. 75
d. 10
A statistic is a measure on a sample, while a parameter is a measure on the whole population.
A statistic is a numerical measurement that describes a specific characteristic of a sample. In this case, the mean and standard deviation calculated from the sample of 75 third graders are statistics.
So, the statistic among the answer choices is:
b. 53