Elementary Statistics
12th Edition
ISBN: 9780321836960
Author: Mario F. Triola
Publisher: PEARSON
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Chapter 5.4, Problem 14BSC
a.
To determine
The mean and standard deviation for the number of correct responses in the group of 280 trials.
b.
To determine
To find: Whether 123 times in the 280 trials is unusually low or high number of correct responses.
To suggest: The result about the ability of touch from the obtained results.
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In a science fair project, Emily conducted an experiment in which she tested professional touch therapists to see if they could sense her energy field. She flipped a coin to select either her right hand or her left hand, and then she asked the therapists to identify the selected hand by placing their hand just under Emily's hand without seeing it and without touching it. Among
354
trials, the touch therapists were correct
170
times. Complete parts (a) through (d).
a. Given that Emily used a coin toss to select either her right hand or her left hand, what proportion of correct responses would be expected if the touch therapists made random guesses?
nothing
(Type an integer or a decimal. Do not round.)
b. Using Emily's sample results, what is the best point estimate of the therapists' success rate?
nothing
(Round to three decimal places as needed.)
c. Using Emily's sample results,
construct
a
95%
confidence interval estimate of the proportion of correct…
In a science fair project, Emily conducted an experiment in which she tested professional touch therapists to see if they could sense her energy field. She flipped a coin to
select either her right hand or her left hand, and then she asked the therapists to identify the selected hand by placing their hand just under Emily's hand without seeing it
and without touching it. Among 325 trials, the touch therapists were correct 155 times. Complete parts (a) through (d)
a. Given that Emily used a coin toss to select either her right hand or her left hand, what proportion of correct responses would be expected if the touch therapists made
random guesses?
(Type an integer or a decimal. Do not round.)
In a science fair project. Emily conducted an experiment in which she tested professional touch therapists to see if they could sense her energy field. She flipped a coin to select either her right hand or her left hand, and then she asked the therapists to identify the selected hand by placing their hand just under Emily's hand without seeing it and without touching it. Among 329 trials, the touch therapists were correct 157 times. Complete parts (a) through (d)
a. Given that Emilv used a coin toss to select either her right hand or her left hand. what proportion of correct responses would be expected if the touch therapists made random guesses?
(Type an integer or a decimal. Do not round.)
b. Using Emily's sample results, what is the best point estimate of the therapists' success rate?
(Round to three decimal places as needed.)
Chapter 5 Solutions
Elementary Statistics
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