Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. Here are data on the penetrability of the same type of soil at two levels of compression. Penetrability is a measure of how much resistance plant roots will meet when they try to grow through the soil. Omit the outlier in calculating your answer. Compressed Soil 286 268 292 282 2.76 281 2.78 3.08 294 2.86 3.08 2.82 2.78 298 3.00 2.78 296 290 3.18 3.16 Intermediate Soil 14 3.38 3.10 3.40 3.38 3.14 3.18 3.26 2.96 3.02 .54 3.36 3.18 3.12 3.86 2.92 346 3.44 3.62 4.26 3 Data Se eBook Give a 90% confidence interval for the decrease in penetrability of compressed soil relative to intermediate soil. a) -0.51 to 0.25 b) 0.25 to 0.51 c) -0.49 to 0.27 d) 0.56 to -0.29