1. Intro to Stats and Collecting Data

Which of the following is the most appropriate application area for statistical quality control?

Which of the following is true of convenience sampling?

In statistics, what is the term for the entire group that a researcher wants to study or describe?

Which of the following is NOT quantitative data?

Which of the following is not a characteristic of the $t$ test?

Which of the following is not true about the tails in a distribution?

You collect the test scores of every other student in a class. Is this data set a population or sample?

A report shows the amount (in dollars) spent by each customer in a grocery store. Is this data set a population or sample?

46.5% of all registered voters in a country are registered democrats. Is this a parameter or a statistic?

A survey of 40 gym members from a large gym finds an average work out duration is 52 minutes. Is this a parameter or a statistic?

Which of the following is a discrete quantitative set of data?

Computer Virus In an AOL survey of Internet users, this question was posted online: “Have you ever been hit by a computer virus?” Among the 170,063 responses, 63% answered “yes.” What term is used to describe this type of survey in which the people surveyed consist of those who chose to respond? What is wrong with this type of sampling method?

Reported Versus Measured In a survey of 1046 adults conducted by Bradley Corporation, subjects were asked how often they wash their hands when using a public restroom, and 70% of the respondents said “always.”

a) Identify the sample and the population.

In Exercises 5–8, determine whether the given source has the potential to create a bias in a statistical study.

AAA The American Automobile Association (AAA) is a not-for-profit federation of motor clubs that provides automotive and travel services. AAA conducts a survey of its members about their use of public transportation versus private automobiles.

In Exercises 13–20, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.

Bias in Jury Selection In the case of Casteneda v. Partida, it was found that during a period of 11 years in Hidalgo County, Texas, 870 people were selected for grand jury duty, and 39% of them were Americans of Mexican ancestry. Among the people eligible for grand jury duty, 79.1% were Americans of Mexican ancestry.