To Compare the Effect of Weather on Sales of Soft $\pm$

question 9

Multiple Choice

To compare the effect of weather on sales of soft drinks, a soda manufacturer sampled two regions of the country with the following results. Is there a difference in sales between the 2 regions?
i. Using the 1% level of significance, the critical value is $\pm$ 2.58.
ii. The z-statistic is 3.40.
iii. Your decision is to reject the null hypothesis.

• A) (i), (ii), and (iii) are all correct statements.
• B) (i) and (ii) are correct statements but not (iii).
• C) (i) and (iii) are correct statements but not (ii).
• D) (ii) and (iii) are correct statements but not (i).
• E) (ii) is a correct statement but not (i) and (iii).

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Definitions:

Assumptions

Accepted beliefs or statements taken for granted without proof.

Observations

The act of noticing and recording something, often used as a method in scientific research to gather data.

Theory

A system of ideas intended to explain something, based on general principles independent of the thing to be explained.

Operational Definition

A statement of the procedures or ways in which a research concept, variable, or phenomenon is measured or experienced.