Chapter 13, Problem 13.1AYK

To determine

To find: the mean refractory period of 4 rats poisoned with DDT is 1.75 ms. Is each of the boldface numbers a parameter or a statistic?

Answer to Problem 13.1AYK

Hence, 1.75 is statistics.

Explanation of Solution

Given: Mean refractory period in a healthy rat is 1.3 milliseconds (ms) and the mean refractory period of 4 rats poisoned with DDT is 1.75milliseconds (ms).

Calculation:

A parameter is a number that describes the population. The exact value population cannot be determined as it is large.

So in problem it is given that the mean refractory period in a health rat is 1.3millisecond

So here 1.3 is a parameter.

Statistics is a number that can be computed from sample data without making use any unknown Parameter.

In other part of the problem the mean refractory period of 4 rats poisoned with DDT is 1.75 given.

Hence, 1.75 is statistics.

Conclusion:

Hence, 1.75 is statistics.