Does soil filled with nitrogen increase the weight of worms compared with soil without nitrogen? The weight of 12 randomly selected worms is acquired, six in soil with nitrogen and six in soil without nitrogen. The mean weight of worms in soil with nitrogen was 41.3 micrograms whereas the mean weight of worms in soil without nitrogen was 38.9 micrograms. A researcher randomized the data over 100 trials, and the difference of means for each trial is shown in the dot plot below. Hint: where SD is the standard deviation, XH is the high value, and XL is the low value

Hint: where SD is the standard deviation and N is the sample size

Part A: What is the margin of error (ME) for this study? Show your work.

Part B: What can the researcher conclude from this study? Explain using complete sentences.