91Ó°ÊÓ

Briefly describe the two meanings of the word statistics.

Explain the meaning of an element, a variable, an observation, and a data set.

Explain the meaning of the following terms. a. Quantitative variable b. Qualitative variable c. Discrete variable d. Continuous variable \(e_{\text {Quantitative data }}\) f. Qualitative data

Indicate which of the following variables are quantitative and which are qualitative. a. The amount of time a student spent studying for an exam b. The amount of rain last year in 30 cities c. The arrival status of an airline flight (early, on time, late, canceled) at an airport d. A person's blood type e. The amount of gasoline put into a car at a gas station

Classify the following quantitative variables as discrete or continuous. a. The amount of time a student spent studying for an exam b. The amount of rain last year in 30 cities c. The amount of gasoline put into a car at a gas station d. The number of customers in the line waiting for service at a bank at a given time

A survey of families living in a certain city was conducted to collect information on the following variables: age of the oldest person in the family, number of family members, number of males in the family, number of females in the family, whether or not they own a house, income of the family, whether or not the family took vacations during the past one year, whether or not they are happy with their financial situation, and the amount of their monthly mortgage or rent. a. Which of these variables are qualitative variables? b. Which of these variables are quantitative variables? c. Which of the quantitative variables of part \(\mathrm{b}\) are discrete variables? d. Which of the quantitative variables of part \(\mathrm{b}\) are continuous variables?

Briefly explain the difference between a census and a sample survey. Why is conducting a sample survey preferable to conducting a census?

Explain the following. a. Random sample b. Nonrandom sample c. Convenience sample d. Judgment sample e. Quota sample

Explain the following four sampling techniques. a. Simple random sampling b. Systematic random sampling c. Stratified random sampling d. Cluster sampling

In which sampling technique do all samples of the same size selected from a population have the same chance of being selected?