Here is a dotplot for the ages of 21 male rattlesnakes captured at a single site. Assume that these 21 snakes can be regarded as a random sample of all male rattlesnakes at that site. Th e average age is 8.571 years, with a standard deviation of 2.942 years. An approximate 95% confidence interval is calculated to be (7.2318, 9.9102).

a. What is the observational unit for this data set? What is the population? What is the sample?
b. Which, if any, of the validity conditions for using a theory-based interval are satisfied? Explain your answer.
c. What is the parameter being estimated by the interval?
d. True or false? Th e chance that the interval contains the parameter value is about 95%. Explain your answer.

Transcribed Image Text:

(n = 21) 15 12 3 Rattlesnake ages