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QNT 275 Week 1 Quiz
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Cross-section data are collected:
on different elements for the same variable for different periods of time
on the same variable for the same variable at different points in time
on different elements at the same point in time
for a qualitative variable
An independent group wants to determine if the consumption of gasoline has increased due to changes in price. The group randomly selects 320 gas stations from 12 different states and collects data from the month of the year when gas is the cheapest and from the month of the year when gas is the most expensive. The data shows no significant difference in gas consumption between the two months. In this example, what is the variable being studied?
The 320 gas stations chosen.
The price of gasoline.
The 12 different states.
The consumption of gasoline.
A simple random sample is a sample drawn in such a way that:
each member of the population has some chance of being included in the sample
each member of the population has a 0.10 chance for being included in the sample
each sample of the same size has an equal chance of being selected
every tenth element of an arranged population is included
The Ohio lottery involves selecting 5 numbers from 5 different bins. This is an example of sampling
In statistics, a population consists of:
a selection of a limited number of elements
all people living in the area under study
all people living in a country
all subjects or objects whose characteristics are being studied
Under inferential statistics, we study
the methods to make decisions about one or more populations based on sample results
how to make decisions about a mean, median, or mode
tables composed of summary measures
how a sample is taken from a population