Weather Forecasters Would Like to Report on Temperatures in Washington

question 119

Essay

Weather forecasters would like to report on temperatures in Washington, DC. In particular, they would like to compare the temperatures in December to temperatures in January to help potential tourists understand whether there is a difference. They believe it is colder in January but want to conduct a test to support their assertion. The average December temperature in a random sample of 16 days is 35 and the average January temperature in a random sample of 20 days is 33. The standard deviations based on historic information are 4 for December and 5 for January.
A) Specify the competing hypotheses to determine if it is colder in January than in December.
B) Find the critical value(s) of the appropriate test at the 5% significance level.
C) Calculate the value of the test statistic.
D) Make a conclusion at the 5% significance level.

• A) Specify the competing hypotheses to determine if it is colder in January than in December.
• B) Find the critical value(s) of the appropriate test at the 5% significance level.
• C) Calculate the value of the test statistic.
• D) Make a conclusion at the 5% significance level.

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Definitions:

Mediating Variable

A type of variable in statistical analysis that explains the relationship between two other variables, often indicating the mechanism through which an effect occurs.

Intervening Variable

An intervening variable is a hypothetical concept that explains the relationship between the independent (causal) and dependent (effect) variables in an experiment.

Political Affiliation

An individual's or group's association with a particular political party or ideology.

Political Orientation

Describes an individual's or group's predisposition towards certain political ideologies, parties, or policies.