Solve the Problem. -By Switching Service Providers, a Family's Telephone Bill Decreased from Bill

question 325

Multiple Choice

Solve the problem.
-By switching service providers, a family's telephone bill decreased from about $50 a month to about $46. By what percent did the monthly bill decrease?

• A)8%
• B)4%
• C)8.7%
• D)9%

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Definitions:

Rejection Region

The range of values for which the null hypothesis is rejected in hypothesis testing.

Wilcoxon Signed-Rank Test

A non-parametric statistical test used to compare two related samples to determine if their population mean ranks differ.

Nonparametric Method

Statistical methods that are not based on parametric assumptions about the distribution of the population.

Matched Pairs

A study design where pairs of subjects are matched in terms of key variables before administering treatments.