Question

A soft drink manufacturer wishes to know how many soft drinks teenagers drink each week. They want to construct a 90%90% confidence interval for the mean and are assuming that the population standard deviation for the number of soft drinks consumed each week is 1.41.4. The study found that for a sample of 10831083 teenagers the mean number of soft drinks consumed per week is 5.65.6. Construct the desired confidence interval. Round your answers to one decimal place.

Answer 1

5.6   1.645 ( 1.4 / 1083 )

5.6   0.07

( 5.5 , 5.7 )

At 90 % CI for population mean is ( 5.5 , 5.7 )