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. Develop and interpret a 90% confidence interval estimate for the mean annual coffee consumption of Danish coffee drinkers.
A) (6.4257, 6.6479)
B) (6.1768, 6.8968)
C) (6.3881, 6.6855)
D) (6.3366, 6.7370)

Question

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. Develop and interpret a 90% confidence interval estimate for the mean annual coffee consumption of Danish coffee drinkers. 
A) (6.4257, 6.6479) 
B) (6.1768, 6.8968) 
C) (6.3881, 6.6855) 
D) (6.3366, 6.7370)

Quizplus · Accepted Answer

The correct confidence interval (6.3881, 6.6855) suggests that we are 90% confident that the true mean annual coffee consumption of Danish coffee drinkers lies within this range. This interval is calculated based on the sample data provided and reflects the average consumption plus or minus the margin of error at the 90% confidence level.

The File Danish Coffee Contains a Random Sample of 144