Laundry Detergent Preference Narrative
A consumer would like to know if there is a difference in the performance of three different laundry detergents. Eighteen pieces of white cloth were soiled with grape juice then washed in one of the three detergents A, B, or C. The resulting whiteness readings are listed below, where the larger number indicates whiter fabric. 
-Refer to Laundry Detergent Preference Narrative. Develop and interpret a 95% confidence interval for 
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Definitions:
Snellen Chart
A visual acuity chart used by eye care professionals to measure the clarity of a patient's vision.
Enema
A medical procedure involving the injection of liquid into the rectum to induce bowel movements or administer medication.
Tonometry
Measuring tension or pressure and especially intraocular pressure.
Cerumen
The technical term for earwax, a substance secreted in the ear canal with protective, cleaning, and lubricating properties.
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