Exam-style questions in the shape of Paper 1 and Paper 2, with full markschemes. Read the markscheme, or type, photograph or draw your answer and get it marked.
At a parcel centre, is the excess handling time, in minutes, for a randomly selected parcel. Figure 1 shows the probability distribution of
Calculate and
For a parcel with excess handling time the additional handling charge in AUD, is modelled by Hence determine and
A parcel-delivery company defines its daily forecast error as
A random sample of 16 independent days has a mean forecast error of 18.4 parcels and a sample standard deviation of 12.0 parcels. The daily forecast errors may be modelled by a normal population, whose standard deviation is unknown.
State which distribution should be used to construct a confidence interval for the population mean forecast error,
Calculate a 95% confidence interval for Give both endpoints to one decimal place.
The planning director claims that the forecasts are unbiased, so that Use your interval to comment on this claim and state the direction of any bias indicated.
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