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# Planning an experiment

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Question1
Mary is planning a study to see if learning of 6th graders on a math lesson is affected by background noise level. She wants to use a t-test for independent groups to analyze her results. Help her plan her study. What is her independent variable (IV) here? Describe two conditions she could create for the IV in her study. What is her dependent variable (DV) here? Describe a way to measure the DV so that each participant would have one score at the end. Would this DV measure be on a continuous scale of measurement? Why is this important? Explain and justify. [Reference Needed]

Question 2
Consider Mary's experiment regarding whether learning of 6th graders on a math lesson is affected by background noise level. Mary has collected her data. What is the null hypothesis for her study? What is the alternative hypothesis for her study? What are the assumptions that must be met about her data before she can correctly use an independent t-test to test the hypotheses? Why? How would she see if her data meet these assumptions? How much room does she have to violate any of these assumptions and still get accurate results from the t-test? Explain and support your answers.[Reference Needed]

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#### Solution Preview

Question-1:
Mary is planning a study to see if learning of 6th graders on a math lesson is affected by background noise level. She wants to use a t-test for independent groups to analyze her results. Help her plan her study. What is her independent variable (IV) here? Describe two conditions she could create for the IV in her study. What is her dependent variable (DV) here? Describe a way to measure the DV so that each participant would have one score at the end. Would this DV measure be on a continuous scale of measurement? Why is this important? Explain and justify.
Solution-1:
The independent variable (IV) is 'background noise level'.
As Mary is planning to use t-test for independent groups, she must create two independent groups of background noise level. For this, she must first create two separate environments comprising of two distinct background noise levels. One environment must have zero or almost nil background noise level and the other environment must have high or substantial background noise level.
The dependent variable (DV) is the 'level of learning 6th graders on a math lesson'.
Mary should subject some of the 6th graders to the first ...

#### Solution Summary

The expert plans an experiment. Two conditions to create IV studies are provided.

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