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College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter8: Sequences, Series, And Probability
Section8.CR: Chapter Review
Problem 37E: Find the positive geometric mean between 4 and 64.
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Proportion of US Residents Less than 25 Years Old
The US Census indicates that 35% of US residents are less than 25 years old. Figure 3.7 shows possible sampling distributions for the proportion of a sample less than 25 years old, for samples of size n = 20, n = 100, and n = 500.
Figure 3.7   Match the dotplots with the sample size
(a)  
Which distribution goes with which sample size?
b)  
If we use a proportion p^, based on a sample of size n = 20, to estimate the population parameter p = 0.35, would it be very surprising to get an estimate that is off by more than 0.10 (that is, the sample proportion is less than 0.25 or greater than 0.45)? How about with a sample of size n = 100? How about with a sample of size n = 500?
(c)  
Repeat part (b) if we ask about the sample proportion being off by just 0.05 or more.
(d)  
Using parts (b) and (c), comment on the effect that sample size has on the accuracy of an estimate.
 
 
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