A study was conducted to see if an advertisement campaign would increase market share for Sanka instant
Question:
a. Estimate the population proportion choosing Sanka for the
(i) First purchase
(ii) Second purchase.
b. Explain how each proportion in part a can be found as a sample mean and how the estimated difference of population proportions is a difference of sample means.
c. The table also shows results of a confidence interval for the difference between the population proportions. Explain how to interpret it.
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Related Book For
Statistics The Art And Science Of Learning From Data
ISBN: 9780321755940
3rd Edition
Authors: Alan Agresti, Christine A. Franklin
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