A researcher was interested in knowing if preterm infants with late metabolic acidosis and preterm infants without the condition differ with respect to urine levels of a certain chemical. The mean levels, standard deviations, and sample sizes for the two samples studied were as follows:a) Assume normality and unequal variances for the two groups, find the 90% confirdence interval for the difference of average chemical levels, between the preterm infants and without the condition.b) Test the null hypothesis (state H, H and critical value) that the preterm infants with and without the condition have the same population mean urine levels for this chemical, using a two-sided test at = 0.10 fir this testc) If we donΓ’ΒΒt want to assume the urine levels of this chemical
are normally distributedbut want to
test if the medians of the urine level of this chemical for the two populationsare equal, what test shall we use? The
urine levels of this chemical in the 2 samples
are shown below. Test this hypothesis at ?=0.10level (state H0, HA, and
p-value).
With condition: 9.7, 1.5, 7.9, 4.9,3.4
Without condition: 11.1, 9.6, 7.4,
8.5, 9.8, 6.5, 8.1, 7.3,10.2
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