The file Danish Coffee contains a random sample of 144 Danish coffee drinkers and measures the annual coffee consumption in kilograms for each sampled coffee drinker. A marketing research firm wants to use this information to develop an advertising campaign to increase Danish coffee consumption.
a. Based on the sample's results, what is the best point estimate of average annual coffee consumption for Danish coffee drinkers?
b. Develop and interpret a 90% confidence interval estimate for the mean annual coffee consumption of Danish coffee drinkers.