Question
Asked Feb 16, 2020
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In Exercises 5–16, use analysis of variance for the indicated test.

Lead and Full IQ Scores Example 1 used measured performance IQ scores for three different blood lead levels. If we use the same three categories of blood lead levels with the full IQ scores, we get the accompanying Excel display. (The data are listed in Data Set 7 “IQ and Lead” in Appendix B.) Using a 0.05 significance level, test the claim that the three categories of blood lead level have the same mean full IQ score. Does it appear that exposure to lead has an effect on full IQ scores?

Excel

ANOVA
Source of Variation
Between Groups
within Groups
df MS F
2 469.1827 2.303395 0.104395 3.07309
118 203.6918
F crit
SS
938.3653
24035.63
P-value
Total
24974
120
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ANOVA Source of Variation Between Groups within Groups df MS F 2 469.1827 2.303395 0.104395 3.07309 118 203.6918 F crit SS 938.3653 24035.63 P-value Total 24974 120

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Expert Answer

Step 1

The provided excel output is:

Statistics homework question answer, step 1, image 1

Step 2

Here, it is required to check the claim that the three categories of blood lead level have the same mean full IQ score.

The null and alternative hypotheses are:

Statistics homework question answer, step 2, image 1

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