Several methods of estimating the number of seeds in soil samples have been developed by ecologists. An article in the Journal of Ecology (€œA Comparison of Methods for Estimating Seed Numbers in the Soil€ [1990]: 1079€“ 1093) considered three such methods. The accompanying data give number of seeds detected by the direct method and by the stratified method for 27 soil specimens

Do the data provide sufficient evidence to conclude that the mean number of seeds detected differs for the two methods? Test the relevant hypotheses using a = .05.

Transcribed Image Text:

Spedimen Direct Stratified Spedimen Direct Stratified 24 32 60 52 28 40 12 100 56 52 10 12 14 16 18 20 92 24 13 15 76 32 28 12 12 24 12 12 19 21 92 40 92 48 24 24 26 25 12 40 76 16