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:

Positive Associations

The beneficial connections or relationships customers make between a brand or product and their personal perceptions or experiences.

Semantic Scales

A type of survey rating scale that uses words rather than numbers to identify the distance between points on the scale, often used in measuring attitudes or perceptions.

Perceptual Maps

A visual representation used in marketing to display customers' perceptions of a brand or product in comparison to its competitors on various attributes.

Customer Value Maps

A visual or graphical representation of the value that customers derive from a product or service compared to its competitors.