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Proficient – Performs the following with no more than one error: identification of the null and alternate hypotheses, identification of the test to use, correct data, identification of where data used is located, set-up for the test, answers to the questions, and

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Teacher notes to errors made

( 2.64 / 3.00) Performs and Interprets an ANOVA Test on Performance Data

Proficient – Performs the following with no more than one error: identification of the null and alternate hypotheses, identification of the test to use, correct data, identification of where data used is located, set-up for the test, answers to the questions, and  a clear and accurate interpretation of the results.

Comments:

The complete (all 50) data values are used or are not accurately listed under each grade level heading.

The rejection of the null hypothesis means that grades/salary levels impact the average compa-ratios.

( 2.28 / 3.00) Performs and Interprets an ANOVA Test on Performance Data

Basic – Has errors in only two or three areas: identification of the correct pairs to compare, mean differences, and the correct t-value; calculation of the +/- values; and identification of the significantly different pairs of means.

Comments:

The t value is not correct. For 50 values, t = tinv.2t(0.05, 44) = 2.015

Some or all of the +/- terms were not calculated correctly. It is t * sqrt(MSW * (1/n1 +1/n2), where n1 and n2 are from the respective groups being compared. MSW comes from the ANVOA table.

( 1.76 / 2.00) Conclusions and Interpretations

Proficient – Has errors in only one area: identification of the correct pairs to compare, mean differences, and the correct t-value; calculation of the +/- values; and identification of the significantly different pairs of means.

Comments:

The results do say that compa-ratios are different for some salary levels.

Differences in the compa-ratios could be due to poorly aligned midpoints.

Since salary has a grade impact, the results really do not change our findings.

Overall Score: 6.68 / 8.00

Overall Grade: 6.68

 
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