A random sample of 70 suspension helmets used by motorcycle riders and automobile race-car drivers was subjected to an impact test, and on 17 of these helmets some damage was observed. (a) Find a 95% two-sided confidence interval on the true proportion of helmets of this type that would show damage from this test. Round your answers to 3 decimal places.
A random sample of 70 suspension helmets used by motorcycle riders and automobile race-car drivers was subjected to an impact test, and on 17 of these helmets some damage was observed. (a) Find a 95% two-sided confidence interval on the true proportion of helmets of this type that would show damage from this test. Round your answers to 3 decimal places.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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![A random sample of 70 suspension helmets used by motorcycle riders and automobile race-car drivers was subjected to an impact
test, and on 17 of these helmets some damage was observed.
(a) Find a 95% two-sided confidence interval on the true proportion of helmets of this type that would show damage from this test.
Round your answers to 3 decimal places.
<p<
(b) Using the point estimate of p obtained from the preliminary sample of 70 helmets, how many helmets must be tested to be 95%
confident that the error in estimating the true value of p is less than 0.02?
n =
(c) How large must the sample be if we wish to be at least 95% confident that the error in estimating p is less than 0.02, regardless of
the true value of p?
п](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7d7f8ba3-ac35-40be-9d69-f75baa192b25%2F7b6135f2-f4dd-4fd3-95f2-c903c7dc187b%2Fz5k12l_processed.png&w=3840&q=75)
Transcribed Image Text:A random sample of 70 suspension helmets used by motorcycle riders and automobile race-car drivers was subjected to an impact
test, and on 17 of these helmets some damage was observed.
(a) Find a 95% two-sided confidence interval on the true proportion of helmets of this type that would show damage from this test.
Round your answers to 3 decimal places.
<p<
(b) Using the point estimate of p obtained from the preliminary sample of 70 helmets, how many helmets must be tested to be 95%
confident that the error in estimating the true value of p is less than 0.02?
n =
(c) How large must the sample be if we wish to be at least 95% confident that the error in estimating p is less than 0.02, regardless of
the true value of p?
п
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