For each of the following situations, discuss the nature of the population of in

Question

For each of the following situations, discuss the nature of the population of interest, the variable of interest, and the parameter of interest. a. A city engineer wants to estimate the average weekly water consumption for single-family dwelling units in the city. b. A medical scientist wants to estimate the average length of time until the recurrence of a certain disease. c. An electrical engineer wants to determine whether the average lifetime of transistors of a certain type is greater than 500 hours.

Explanation / Answer

1.(a) Population: All the families in the city.

Variable: Weekly water consumption for single-family dwelling units

Parameter: Average weekly water consumption for single-family dwelling units.

(b) Population: Persons having that particular disease.

Variable: Time until recurrence of a certain disease.

Parameter: Average length of time until the recurrence of a certain disease.

(c) Population: All the transistors considered for experiment.

Variable: Lifetime of transistors.

Parameter: Average lifetime of transistors.

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