According to previous studies, 12% of the U.S. population is left-handed. Not knowing this, a high school student claims that the percentage of left-handed people in the U.S. is 14%. The student is going to take a random sample of 1650 people in the U.S. to try to gather evidence to support the claim. Let p be the proportion of left-handed people in the sample. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of p. (b) Find the standard deviation of D (c) Compute an approximation for P (p ≤0.14), which is the probability that there will be 14% or fewer left-handed people in the sample. Round your answer to four decimal places.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.4: Collecting Data
Problem 3E
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According to previous studies, 12% of the U.S. population is left-handed. Not knowing this, a high school student claims that the percentage of left-handed people in the U.S. is 14%. The student is going to take a random sample of 1650 people in the U.S. to try to gather evidence to support the claim. Let p be the
proportion of left-handed people in the sample.
Answer the following. (If necessary, consult a list of formulas.)


(a) Find the mean of p.

(b) Find the standard deviation of D


(c) Compute an approximation for P (p ≤0.14), which is the probability that there will be 14%
or fewer left-handed people in the sample. Round your answer to four decimal places.

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