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statistic and probability

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a Which sampling method has the secretary adopted? Comment on the appropriateness of the secretary’s sampling method in providing reliable information to the district council on the overall attitude of the residents towards the building of the outpatient clinic. (8 marks)

b Determine a sampling method that would be more appropriate to determine the actual overall sentiment of the residents on the issue and outline how a representative sample can be drawn.

c Use Excel to construct a frequency distribution and a histogram to summarize the sampled data. Begin your first class at ‘0 but less than 3’, and end with the last class at ‘12 but less than 15’. Describe the shape of the distribution. (13 marks)

d Compute the corresponding mean and standard deviation of the grouped data you obtained in part (c).

a Find the probability that among the six balls selected, three of them do not meet the shape specification for each of the following case:

6 simple probability and statistic questions

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