Using the data on page 497, carry out a t-test to determine whether the difference between petal lengths in woodland and in a garden is significant.

Data on page 497

A student measured the length of 21 petals from flowers of a population of a species of plant growing in woodland. These were the results:

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Petal lengths in woodland population/mm 3.1 3.2 2.7 3.1 3.0 3.2 3.3 3.1 3.1 3.3 3.3 3.2 3.2 3.3 3.2 2.9 3.4 2.9 3.0 2.9 3.2 The formula for calculating standard deviation is: E(x-x)2 S=, n-1 where: X is the mean E stands for 'sum of x refers to the individual values in a set of data n is the total number of observations (individual values, readings or measurements) in one set of data s is standard deviation Vis the symbol for square root