The economics department secretary wants to estimate the average number of bottled drinks sold each day out of the vending machine. Similar vending machine sales have a standard deviation of 9 bottles per day. He wants to be 95-percent confident that the estimate, x, obtained is within 3 bottles of the true mean . How large a sample is needed if the limit of the Coke machine for one day is 120?
Question 2
As marketing manager for a very large discount building supply, you wish to know what proportion of your city's population conducted do-it-yourself home improvement projects during the past year. The national percentage is 62; therefore, you decide to use this value in estimating sample size for a study to achieve 90 confidence with the estimate no more than 5 from the true proportion. If you know that the total city population is 30,000, what is the appropriate sample size?
Rabbit meat sold commercially
An emergency department physician at work
Average Normal Blood Pressure Readings
Average Years of Schooling versus GDP per Capita
What would your average (mean) number of cells per cluster be?
Labour economics