Chapter 1 Flashcards
A _______ is a numerical measurement describing some characteristic of population.
Parameter
A ______ is a numerical measurement describing some characteristic of a sample.
Statistic
The Gallup Organization contacts 1038 male university graduates who have a white collar job and asks whether or not they had received a raise at work during he past 4 months.
What is the Population Study?
Male university graduates who have a white collar job.
The Gallup Organization contacts 1038 male university graduates who have a white collar job and asks whether or not they had received a raise at work during he past 4 months.
What is the sample in he study?
The 1038 male university graduates who have a white collar job.
Some people responded to this request: “Dial 1-900-PRO-LIFE to participate in a telephone poll on abortion. ($4.45 per minute. Average call: 2 minutes. You must be 1717 years old.)
Identify the sample
The sample is all individuals who responded.
Some people responded to this request: “Dial 1-900-PRO-LIFE to participate in a telephone poll on abortion. ($4.45 per minute. Average call: 2 minutes. You must be 1717 years old.)
Identify the population.
The population is all individuals who are at least 17 years of age.
Some people responded to this request: “Dial 1-900-PRO-LIFE to participate in a telephone poll on abortion. ($4.45 per minute. Average call: 2 minutes. You must be 1717 years old.)
Is the sample likely to be representative of the population?
No, the sample is not likely to be representative of the population because those with strong opinions about abortion are more likely to respond.
How do a parameter and a statistic differ?
A parameter is a numerical measurement of a population; a statistic is a numerical measurement of a sample.
Determine whether the given value is a statistic or a parameter.
In a study of all 3887 students at college, i is found that 45% own a computer.
Parameter because the value is a numerical measurement describing a characteristic of a population.
A variable is at the ______ level of measurement if he values of the variable name, label, or categorize.
Nominal
A variable is at the _______ level of measurement if it allows for the values of the variable to be arranged in a specific order but the differences between values either cannot be determined or are meaningless.
Ordinal
A variable is at the _______ level of measurement if it allows for the values of the variable to be arranged in a specific order and the difference between any two values is meaningful, but the ratio is not.
Interval
A variable is at the _______ level of measurement if it allows for the values of the variable to be arranged in a specific order and both differences and ratios of values have meaning.
Ratio
What is a voluntary response sample?
A sample in which the subjects themselves decide whether to be included in the study.
Which sampling method divides the population up into sections, randomly selects some of those sections, then chooses all the members from the selected sections to study?
Cluster
Which sampling method subdivides the population into categories sharing similar characteristics and then selects a sample from each subdivision?
Stratified
A television station asks its viewers to call in their opinion regarding the desirability of programs in high definition TV.
Which type of sampling method is used?
Convenience
To estimate the percentage of defects in a recent manufacturing batch, a quality control manager at Toyota selects every 14th car that comes off the assembly line starting with the seventh until she obtains a sample of 130130 cars.
Systematic
To determine customer opinion of their service, Business Depot randomly selects 120 stores during a certain week and surveys all customers present in the store.
Cluster
Categories only
Nominal
Categories with some order
Ordinal
Differences but no natural starting point
Interval
Differences and a natural starting point
Ratio
