Sheet175Non-smokers61999998093Non-smokers68000001907Non-smokers740

Sheet1

7.5	Non-smokers
6.1999998093	Non-smokers
6.8000001907	Non-smokers
7.4000000954	Non-smokers
9.1999998093	Non-smokers
8.3000001907	Non-smokers
7.5999999046	Non-smokers
5.8000001907	Ex-smokers
7.3000001907	Ex-smokers
8.1999998093	Ex-smokers
7.0999999046	Ex-smokers
7.8000001907	Ex-smokers
5.9000000954	Light smokers
6.1999998093	Light smokers
5.8000001907	Light smokers
4.6999998093	Light smokers
8.3000001907	Light smokers
7.1999998093	Light smokers
6.1999998093	Light smokers
6.8000001907	Heavy smokers
6.1999998093	Heavy smokers
5.6999998093	Heavy smokers
4.9000000954	Heavy smokers
6.1999998093	Heavy smokers
7.0999999046	Heavy smokers
5.8000001907	Heavy smokers
5.4000000954	Heavy smokers

Using the provided dataset below, determine whether the mean birthweight for infants differs significantly according to mothers’ smoking status by using a one way ANOVA in Stata. Make sure to include all 5 hypothesis testing steps in your writeup. If you found a significant difference, how might you determine which specific groups differ? Are there any potential problems with the method you have proposed?

· Define the parameter of interest.

· State the hypotheses

· Determine the test statistic and p-value considering any necessary assumptions

· Decide whether to reject or not reject the null hypothesis

· Clearly state a conclusion in the context of the problem

· Specific Comparisons: How would you figure out which specific groups differ?

· Potential Problems: What are the potential problems with the method you have proposed to figure out which groups differ?

Week 8 Written Assignment:

Criteria Satisfactory Needs Improvement Not Evident

Parameter of interest

(6% of Grade)

States the notation for the parameter and what the parameter represents

States the notation for the parameter OR what the parameter represents

Does not state the notation for the parameter AND what the parameter represents

Hypotheses

(16% of Grade)

States the null and alternative hypotheses using the appropriate notation and states what each means in the context of the primary research question

States the null and alternative hypotheses using the appropriate notation, but does not state what each means in the context of the primary research question

Does not state the null and alternative hypotheses using the appropriate notation

Test Statistic and P- Value

(26% of Grade)

Verifies that any necessary assumptions hold and correctly calculates the test statistic and p-value

There is an error in the checking of the assumptions OR does not correctly calculate the test statistic and p-value

There is an error in the checking of the assumptions AND does not correctly calculate the test statistic and p-value

The Decision

(11% of Grade)

Clearly states decision on rejecting null and the significance level of the test

Clearly states decision on rejecting null, but does not state the significance level of the test

Does not state decision on rejecting the null

Conclusion

(21% of Grade)

Utilizes appropriate language to state, in the context of the research question, what the decision means

There are errors in the interpretation of the decision in terms of the research question

Does not provide an interpretation of the decision in terms of the research question

Specific Comparisons

(10% of Grade)

Clearly states the steps to figure out which groups differ

There are errors or gaps in the proposed steps to figure out which groups differ

Did not state the steps to figure out which groups differ

Potential Problems

(10% of Grade)

Clearly identifies potential problems with the proposed comparison method

There are errors in the identification of potential problems with the proposed comparison method

Did not identify potential problems with proposed comparison method

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Sheet1

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