Conduct a test to compare the two types of plots

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Reference no: EM131024878

Lianas are woody vines that grow in tropical forests. Researchers measured liana abundance (stems/ha) in several plots in the central Amazon region of Brazil. The plots were classified into two types: plots that were near the edge of the forest (less than 100 meters from the edge) or plots far from the edge of the forest.The raw data are given and are summarized in the table.

		n MEAN		SD
	Near Far	34 438 34 368		125 114

	NEAR			FAR
639	601	600	470	339	384
605	581	555	309	395	393
535	531	466	236	252	407
437	423	380	241	215	427
376	362	350	320	228	445
349	346	337	325	267	451
320	317	310	352	294	493
285	271	265	275	356	502
250	450	441	181	418	540
436	432	420	250	425	590
419	407		266	495
702	676		338	648

(a) Make normal probability plots of the data to confirm that the distributions are mildly skewed.

(b) Conduct a test to compare the two types of plots at α = 0.05. Use a nondirectional alternative.

(d) Compare the tests from parts (b) and (c).What do these results indicate about the effect on a test of mild skewness when the sample sizes are fairly large?

Reference no: EM131024878

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