Elementary Statistics Chapter 1

The girl's basketball team played a game this Wednesday. Some of the data collected includes free throw percentage, number of assists, and student class (freshman, sophomore...) How many of these variables are qualitative?

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The girl's basketball team played a game this Wednesday. Some of the data collected includes free throw percentage, number of assists, and student class (freshman, sophomore...) How many of these variables are quantitative?

2

Identify the Sample: A restaurant wants to know if customers buy dessert when they eat out. As people leave the restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out. The restaurant concluded that most customers do not order dessert.

20 customers

sample

a group of subjects selected from a population

What would be the population in this example? Surveyors in a mall choose shoppers to ask about products they prefer.

all shoppers in the mall

Mr. Gregory sold several cars this week. Some of the data he collected includes retail price, miles per gallon, number of seats, and whether or not it had navigation. Identify the individual(s) in this study.

cars

descriptive statistics

collecting, organizing, summarizing, presentation of data

population

consists of all subjects that are being studied

inferential statistics

generalizing from samples to populations, performing estimations, hypothesis testing, determining relationships, making predictions

Mr. Gregory sold several cars this week. Some of the data he collected includes retail price, miles per gallon, number of seats, and whether or not it had navigation. Identify the qualitative variable(s) in this study.

navigation option

Which of the following is a quantitative variable? Transportation industry or number of fatal injuries

number of fatal injuries

Parameter or statistic? As of January 2007, 44% of the governors of the 50 states in the US are Republicans.

parameter

Parameter or statistic? In a recent year, the average math scores for all graduates on the ACT was 21.1.

parameter

Parameter or statistic? Sixty-two of the 97 passengers aboard the Hindenburg airship survived its explosion.

parameter

An entire group being studied is called a...

population

discrete variables

quantitative variables; assume values that can be counted; whole numbers

continuous variables

quantitative variables; can assume an infinite number of values between any two specific numbers; whole number and everything in between

Mr. Gregory sold several cars this week. Some of the data he collected includes retail price, miles per gallon, number of seats, and whether or not it had navigation. Identify the variable(s) in this study.

retail price, miles per gallon, number of seats, and navigation option

Mr. Gregory sold several cars this week. Some of the data he collected includes retail price, miles per gallon, number of seats, and whether or not it had navigation. Identify the quantitative variable(s) in this study.

retail price, miles per gallon, seats

Parameter or statistic? In a survey of a sample of high school students, 43% said that their mother has taught them the most about managing money.

statistic

Parameter or statistic? The average annual salary for 35 of a company's 1200 accountants is $68,000.

statistic

What would be the sample in this example? Surveyors in a mall choose shoppers to ask about products they prefer.

the shoppers who were asked their preferences

Which of the following is a qualitative variable? Transportation industry or number of fatal injuries

transportation industry

quantitative variables

variables that can be counted or measured

qualitative variables

variables that have distinct characteristics or attributes