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To whom it may concern:
Please make sure to do a t-test in question4 (c). Thanks
1. The following observations are the estimated payback periods (in
years) for installation of aluminium-framed double glazing in a random
sample of ten homes in Christchurch. These periods reflect the costs of
installation, and energy savings from the insulation.
(a) Draw a boxplot of these data. Do you think a normality assumption
(b)Calculate a 95% confidence interval for the mean payback period for
this sort of retro-fitted double glazing.
(c) How large a sample would be needed to estimate the mean payback
period to within one year?
2. ?The Great Morality Debate? ? an online survey of New Zealanders
asked ?is it wrong for men and women to have sex before marriage?? A
staggering 35% of the 9000 responses were ?yes? although there were
strong regional differences (only of 23% of respondents from Wellington
answered in the affirmative).
(a) Calculate a 95% confidence interval for the population proportion
who believe it is wrong to have sex before marriage.
(b)Assume that the sample data exclude Wellingtonians, and that the
population proportion for Wellingtonians is p=23%. Is the sample
proportion significantly higher?
3. The following table contains weighted average cost of capital
estimates(WACC, in %) for a random sample of New Zealand firms in
two sectors: consumer and property.
Assuming the WACCs are normally distributed with different variances,
conduct a test of equality of means.
percentage of survey respondents who recognized the website brand:
(Answer a and b, but do the t-test in c anyway, ensuring that you
reflect on whether or not it was a good idea to do so.)
(a) Why is a paired comparison justified for these two samples?
(b)Why is a t-test inappropriate for these two samples?
(c) Test the hypothesis that website brand recognition is increasing for
retail websites generally.
Paper#9256557 | Written in 27-Jul-2016Price : $16