STAT TECH IN BUSINESS & ECON LL\AC
STAT TECH IN BUSINESS & ECON LL\AC
18th Edition
ISBN: 9781264720545
Author: Lind
Publisher: MCG
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Chapter 16, Problem 25CE
To determine

State whether there is a preference for one of the two shows.

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A pet store owner wants to know if a new commercial will bring in more people than the old one. Out of a focus group of 500 randomly selected viewers, 250 watch the new commercial and 250 watch the old one. The owner then has each group rate the commercials. Which is the control group?
Maci is a social networking maniac! Although she prefers Instagram, she also spends a lot of time using Twitter, Pinterest, and Facebook. She is curious as to which social networking site is the most preferred for her age group, so she decides to conduct a study. Maci creates a survey to hand out to other students at her school. She plans to collect data from this survey and analyze the results to help her decide which social networking site is the most preferred. What is the variable of interest in this study?     Maci     survey     social media sites     the students
The Bureau of Transportation reports on-time performance for airlines at major airports.  JetBlue, United, and US Airways share Terminal C and Boston's Logan Airport. The percentage of on-time flights reported for a sample month were 76.8% for JetBlue, 71.5% for United, and 82.2% for US Airways. Assume that 30% of the arriving flights at this terminal are JetBlue flights, 32% are United flights, and 38% are US Airways flights. a. Develop a contingency table (table of joint probabilities and marginal probabilities). b. An announcement is made that Flight 1382 will arrive at Terminal C. What is the probability that the flight will arrive on time? c. Flight 1382 arrives on time. What is the probability that Flight 1382 is operated by US Airways?  d. Flight 1382 will not arrive on time. What is the probability that Flight 1382 is operated by United?
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