1. A researcher examines the records of all registered voters in one city and finds that 43% are registered democrats. Is the evaluated group a population or a sample ?
2. A sample of 120 employees of a company is selected and the average age is found to be 37 years. Is the given value a statistics or a parameter?
3. A researcher examines the records of all registered voters in one city and finds that 43% are registered Democrats. Is the given value a statistics or a parameter?