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A researcher asks five questions of a sample of community residents to find out how much they fear crime and whether their level of fear was influenced by a recent well-publicized murder in the community.Explain what the three dimensions of validity would refer to in this study and why they are important.
Gas Price
The cost per unit volume of gasoline, determined by various factors including crude oil prices, taxes, and demand.
Unleaded Gasoline
A type of petrol or fuel for engines that does not contain lead compounds, used to reduce air pollution and protect the environment.
Confidence Interval
An aggregation of values, from the study of sample data, seen as likely to include the value of an unknown parameter in the population.
Mean Height
The average height calculated by summing the heights of all individuals in a group and dividing by the number of individuals.
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