# Question: SoftBus believes it can afford to spend much less time

SoftBus believes it can afford to spend much less time with customers who own PCs and score at least 4 on PCKnowledge. Let’s call these the “PC-savvy” customers. On the other hand, SoftBus believes it will have to spend a lot of time with customers who do not own a PC and score 2 or less on PCKnowledge. Let’s call these the “PC-illiterate” customers.
a. Find a 95% confidence interval for the proportion of all prospective customers who are PC-savvy. Find a similar interval for the proportion who are PC-illiterate.
b. Repeat part a twice, once for the subpopulation of customers who have at least 12 years of experience and once for the subpopulation who have less than 12 years of experience.
c. Again repeat part a twice, once for the subpopulation of customers who have no more than a high school diploma and once for the subpopulation who have more than a high school diploma.
d. Find a 95% confidence interval for the difference between two proportions: the proportion of all customers with some college education who are PC-savvy and the similar proportion of all customers with no college education. Repeat this, substituting “PC-savvy” with “PC-illiterate.”
e. Discuss any insights you gain from parts a through d that might be of interest to SoftBus.

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