Quiz 1 Statistics

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? The respondents are a​ self-selected sample. Many people may choose not to respond to the survey.

The respondents are a​ self-selected sample. Many people may choose not to respond to the survey.

When testing a new​ treatment, what is the difference between statistical significance and practical​ significance? Can a treatment have statistical​ significance, but not practical​ significance? Statistical significance is achieved when the result is very unlikely to occur by chance. Practical significance is related to whether common sense suggests that the treatment makes enough of a difference to justify its use. It is possible for a treatment to have statistical​ significance, but not practical significance.

Statistical significance is achieved when the result is very unlikely to occur by chance. Practical significance is related to whether common sense suggests that the treatment makes enough of a difference to justify its use. It is possible for a treatment to have statistical​ significance, but not practical significance.

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. There does appear to be a potential to create a bias. There is an incentive to produce results that are in line with preferring private automobiles.

There does appear to be a potential to create a bias. There is an incentive to produce results that are in line with preferring private automobiles.