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Minitab work - Assignment Example

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iii)in a previous census, the mean number of female cattle per village was found to be 180.Test the hypothesis that the mean you have calculated has not changed from what it was in this census. To three decimal places, what is the p-Value from the test? Is this significant at…
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In an experiment to investigate the effect of fertiliser on mean yield of an arable crop, 20 different plots were used. Fertiliser A was applied to 10 randomly plot and B was applied to the remaining plots .After a specified time, the yield (in coded units) for each plot was measured giving the following data
i)Perform an F test to see whether assumption of equal variances in the two fertiliser yield group is reasonable .To three decimal places, what is the p value from this F test? is it reasonable to assume that the two fertiliser yields have equal variance
ii)Assuming that the F test suggest that we can pool the variances ,perform a hypothesis test to test whether there is significant difference in fertiliser mean yields (using a two sample t test with pooled variance). What is the value of the t-statistic? What is the value of the pooled variance used in this test ?To three decimal places, what is the p value from the test? Is there evidence to reject the null hypothesis of no difference in means at 5% significance level?
iii)Suppose that instead of the data arising from 20 different plots, there were in fact only 10 plots ,each of which was divided into 2 subplots. For each plot, Fertliser A was applied to randomly selected subplot and fertiliser B was applied to other subplot.
Perform an appropriate hypothesis test to see whether there is evidence that the average difference between the yield from Fertiliser A and B is not zero .To three decimal places, what is the p value from the test? Is there evidence to reject the null hypothesis that the average of the differences is zero, t the 5%signifcance level?
Condition ‘x’ is a medical condition from which 70% of people recover within 7 days if left untreated. The health service would like to increase this proportion by treating sufferers .An experiment was, therefore, conducted to test a new drug ...Download file to see next pagesRead More
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