Practical 1

1. As part of a study on plant growth, a plant physiologist grew 13 individually potted soybean seedlings of the type called "Wells II." She raised the plants in a greenhouse under identical environmental conditions (light, temperature, soil and so on). She measured the total stem length (in cm) for each plant after 16 days of growth. The results are as follows: 20.2 21.9 22.3 20.0 19.4 22.0 21.4 22.0 21.9 20.5 19.7 21.5 20.5 1.1A point estimate for the mean stem length of "Wells II" soybean seedlings on day 16 of growth (accurate to 4 decimal places) is: ______ 1.2 A point estimate for the standard deviation of the stem length of "Wells II" soybean seedlings on day 16 of growth (accurate to 4 decimal places) is: