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Author Question: Suppose a researcher examines a possible relationship in the population and the results are found to ... (Read 21 times)

geoffrey

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on: Jul 24, 2018
Suppose a researcher examines a possible relationship in the population and the results are found to not be statistically significant. Can the researcher conclude that there was no significant relationship in the population? If yes, explain why; if no, describe how the researcher should state their conclusion regarding a possible relationship.

Question 2

Suppose a company says they deliver their packages in 2 days or less, on average, and you are concerned that the packages are taking longer to deliver than promised. You conduct a hypothesis test to help you answer this question. Which alternative hypothesis would give you the best chance of detecting an actual problem, a one-sided alternative (average time of delivering packages is greater than 2 days) or a two-sided alternative (average time delivering packages is not equal to 2 days)? Explain your answer. If both have the same chance, explain why.


wtf444

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Reply #1 on: Jul 24, 2018
Answer to Question 1

NO; THE RESEARCHER CAN SAY THEY WERE UNABLE TO DETECT' A SIGNIFICANT RELATIONSHIP IN THE POPULATION.

Answer to Question 2

THE ONE-SIDED TEST. A TWO-SIDED ALTERNATIVE HAS TO TAKE BOTH DIRECTIONS INTO ACCOUNT, SO YOUR EVIDENCE HAS TO BE STRONGER IN THE OBSERVED DIRECTION TO ACHIEVE STATISTICAL SIGNIFICANCE THAN FOR A ONE-SIDED ALTERNATIVE.


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geoffrey

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Reply #2 on: Jul 24, 2018
Thank you!


wtf444

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Reply #3 on: Jul 24, 2018
Always glad to help...


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