3) A study presents pH measurements of soil specimens taken from 3 different typ

Question

3) A study presents pH measurements of soil specimens taken from 3 different types of soils. The results are given in the following table Soil type pH Measurements Alluvium 6.53, 6.03, 6.75, 6.82, 6.24 Glacial Till 6.07, 6.07, 5.35, 5.75, 5.48, 5.27, 5.80, 5.03, 6.65 Residuum 6.03, 6.16, 6.63, 6.13, 6.05, 5.68, 6.25, 5.43, 6.46, 6.91, 5.75, 6.53 Can you conclude that these soil types are different for their mean pH levels using ?=0.05 significance level. Write down the null and research hypothesis applied in this ANOVA test.

Explanation / Answer

Null hypothesis: these soil types are no different for their mean pH levels

Research hypothesis: these soil types are different for their mean pH levels

The test statistic is

F=5.31

The p-value of F test is 0.0127 (from F table)

Since the p-value is less than 0.05, we reject the null hypothesis.

So we can conclude that these soil types are different for their mean pH levels

Mean n Std. Dev 6.474 5 0.3358 Alluvium 5.719 9 0.4988 Glacial Till 6.168 12 0.4242 Residuum 6.071 26 0.5083 Total

Related Questions

Navigate

• Browse (All)
• Browse 3
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.