Chapter 6 Flashcards
As consumers of popular media, we are more likely to encounter arithmetic means than percentages or proportions.
False
When a variable is measured at the nominal or ordinal-level, we don’t calculate its dispersion but say dispersion is maximized when observations are evenly divided among possible values.
True
A public opinion poll reporting the president’s job approval rating is an example of a ______.
Sample Statistic
Random sampling errors are mistakes or oversights made by the researchers.
False
A researcher studying the height of college freshmen determines the average height of males to be 5’10 with a standard deviation of 1.5 inches. John has a Z score of +1.96, which means John is what height?
6’1
Degrees of freedom are a statistical property of a large family of distributions, including the Student’s t distribution.
True
The US Census is an example of a ______.
Population
The interval within which 95 percent of all possible sample estimates will fall by chance is defined as ______.
the sample mean ±1.96 standard errors
The standard error of a statistic is a single number.
True
The number of degrees of freedom is equal to the sample size, n, minus the number of parameters being estimated by the sample.
True
Researchers study small groups of units of analyses to learn about the characteristics of a ______.
Population
The level of random sampling error in a study is directly related to the ______ in the population characteristic.
Variation
A large group of people of particular interest that we desire to study and understand, such as the people in a city or persons with jobs, is called a ______.
Population
The standard error of a sample mean is synonymous with random sampling error.
True
A researcher working with a sample size of 35 should use the Student’s t distribution to make inferences about the population mean.
True
