The marketing team from Mi Casa Front Porch Restaurant is looking to promote the restaurant on the internet. They want to provide a realistic view of ranges for average bill for a party of 2 for lunch and dinner. They have gathered the following data from a sample to use. Calculate and interpret the confidence intervals for the mean that should be used for both lunch and dinner using a 95% confidence level.
Exercise
Using the data below, identify the confidence interval for the mean based on a 95% confidence level.
Lunch Dinner
$23.36 $44.00
$12.50 $51.90
$15.87 $49.70
$17.56 $40.00
$14.56 $55.50
$19.22 $33.00
$22.00 $43.40
$10.15 $41.30
$18.50 $45.20
$15.20 $40.70
$20.90 $41.10
$12.10 $49.10
$18.80 $30.90
$13.10 $45.20
$19.20 $55.30
$18.60 $52.10
$15.50 $55.10
$13.30 $38.80
$11.90 $43.10
$14.00 $39.20
$15.20 $58.60
$17.90 $49.80
$16.60 $43.20
$19.20 $47.90
$18.80 $46.60