QNT 275 Week 1 Quiz

QNT 275 Week 1 Quiz

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

with replacement.

without replacement.

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