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{i} (ii) Researchers wished to know whether two populations of infants [A and B} differed with respect to the mean age at which drev walked unaided. The following sample data {ages in months] were collected at random from the two populations and are assumed to follow the normal distribution: \"Em-MIME IEE-IEE-\"mm- MM -lm-----IIE llilonstruct a back-to-back stern and leaf plot for this data. Describe the distribution of the two sets of data. [8] The sample means and sample standard deviations of the txvo groups are provided in the table overleaf. Carry out a formal test of equality of population variances, giving full details (including assumptions, hypotheses, test statistic, rejection mgion, test decision and conclusion}. [In]