ng doer, Microhabitat factors associated with forage and bed sites of barking de

Question

ng doer, Microhabitat factors associated with forage and bed sites of barking deer Birkland, China were examined fron 2001 to 2002. In this region woods make up 48% ass plot-makes up 14.7%, and deciduous forests makes up 396%. Of the where the deer forage, 4 were categorized as woods, 16 as cultivated grassplot, and 61 as 6.44 Barking land, cultivated gr cance level. n both tails. on decreases. tatistics book nt it out from s to complete ents, 71 said 25 said they forests. The table below summarizes these data.62 Woods Cultivated grassplot Deciduous forests Other Total 345 6 16 (a) Write the hypotheses for testing if barking deer prefer to forage in certain habitats over others. b) What type of test can we use to answer this research question? (c) Check if the assumptions and conditions required for this test are satisfied. (d) Do these data provide convincing evidence that barking deer pre- Rao Photo by (http://flic.kr/p/4Xjdkk) d read the a test and p-value. fer to forage in certain habitats over others? Conduct an appro- priate hypothesis test to answer this research question. CC BY 2.0 license 61 Four in 10 Americans Believe in Strict Creationism, December 17, 2010,

Explanation / Answer

(a) H0 : There is no preference for barking deer to forage in certain habitat over others.

Ha : There is specific preference for barking deer to forage in certain habitat over others.

(b) We will use chi- square statistic for this type of test.

(c) Here we hae to see that none of the cell value is zero and none of expected value is less than 5.

(d) Here expected value:

For woods = p(woods) * Total Woods = 0.048 * 426 = 20.448

For cultivated grassplot = p(CGP) * total woods = 0.147 * 426 = 62.622

For Deciduos forests = P(DF) * total woods = 0.396 * 426 = 168.696

For Others = p(Others) * Total woods = 0.409 * 426 = 174.234

HEre observed - expected table

X2 = 284.06

for dF = 4-1 = 3 and alpha = 0.05

X2critical = 7.815

p -value = 0.0000

so HEre X2 > X2critical so we shall reject the null hypothesis. There is specific preference for barking deer to forage in certain habitat over others.

Type of wood Observed Expected (O- E)^2/E Woods 4 20.448 13.23 Cultivated Grassplot 16 62.622 34.71 Deciduous Forests 61 168.696 68.75 Others 345 174.234 167.37 Sum 426 426 284.06

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