QUESTION ONE: Find the sample size necessary to find the proportions within 3% at the 95% confidence level if no preliminary estimate of proportions is known.

16

1068

1067

Not enough information given to find the answer.

QUESTION TWO: If a retailer would like to estimate the proportion of their customers who bought an item after viewing their website on a certain day with a 95% confidence level and 7% margin of error, how many customers do they have to monitor? Previous information has shown that 58% of users do this

7

190

6

191

QUESTION THREE: A pig farm owner recently changed the diet of his pigs and wants to find out the average weight gain of the pigs in the new diet over the span of 4 weeks. How many pigs should he sample so that he is 90% confident that the average weight of a pig falls within 2 lbs if the standard deviation is 15.6 lbs?

165

405

13

234