This preview shows page 1. Sign up to view the full content.
Unformatted text preview: took a preliminary study involving measuring the percentage of the
total bill left as a tip for one randomly selected waiter and one randomly
OR, selected waitress in each of 50 restaurants during a 1-week period. The
hypothesize can be found in Servers.xlsx. What conclusions can be drawn from
and testhese data?
waitresses H0: μWaiters–Waitresses = 0
earn larger HA: μWaiters–Waitresses ≠ 0
p-value approach: p = 0.0003 < 0.01.
critical value approach:
tSTAT = –3.7 < tCRIT = –1.68
Therefore, reject null hypothesis.
Therefore, there is evidence to claim
that waitresses earn larger tips. To Try…
4. Researchers conducted a study to estimate the relationship between a
subject’s brain activity while watching a television commercial and the
subject’s subsequent ability to recall the contents of the commercial.
Subjects were shown two commercials for each of ten products. For each
commercial the ability to recall the commercial 24 hours later was
measured. Each member of a pair of commercials viewed by a specific
subject was then designated “high-recall” or...
View Full Document
This document was uploaded on 03/05/2014.
- Spring '13