Question

The price of a head of iceberg lettuce varies greatly with the season and the geographic location of a store. During February a researcher contacts a random sample of 39 grocery stores across the United States and asks the produce manager of each to state the current price charged for a head of iceberg lettuce. Using the researcher’s results that follow, construct a 99% confidence interval to estimate the mean price of a head of iceberg lettuce in February in the United States. Assume that σ is 0.205.

1.59 1.25 1.65 1.40 0.89

1.19 1.50 1.49 1.30 1.39

1.29 1.60 0.99 1.29 1.19

1.20 1.50 1.49 1.29 1.35

1.10 0.89 1.10 1.39 1.39

1.50 1.50 1.55 1.20 1.15

0.99 1.00 1.30 1.25 1.10

1.00 1.55 1.29 1.39

Answer 1