Provide a 95% CI for the difference in mean pod weight between the two groups?

Microbiology

A study sought to demonstrate that soy beans inoculated with nitrogen-fixing bacteria yield more and grow adequately without the use of expensive environmentally deleterious synthesized fertilizers. The trial was conducted under controlled conditions with uniform amounts of soil. The initial hypothesis was that inoculated plants would outperform their uninoculated counterparts. This assumption was based on the fact that plants need nitrogen to manufacture vital proteins and amino acids and that nitrogenfixingbacteria would make more of this substance available to plants, increasing their size and yield. There were 8 inoculated plants (I) and 8 uninoculated plants (U). The plant yield as measured by pod weight for each plant is given in Table 2.28: Pod weight (g) from inoculated (I) and uninoculated (U) plantsa

 

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1.76 0.49 1.45 0.85 1.03 1.00 1.53 1.54 2.34 1.01 1.96 0.75 1.79 2.11 0.92 1.21 Mean 1.634 1.084 sd 0.420 0.510 8. in *The data for this problem were supplied by David Rosner.