Question

According to a poll, 70% of California adults (352 out of 506
surveyed) feel that education is one of the top issues facing
California. We wish to construct a 90% confidence interval for the
true proportion of California adults who feel that education is one
of the top issues facing California.

Find a 90% confidence interval for the population proportion.
(Round your answers to three decimal places.)

Answer #1

Answer: According to a poll, 70% of California adults (352 out of 506 surveyed) feel that education is one of the top issues facing California.

Solution:

x = 352

n = 506

= x/n

= 352/506

= 70% = 0.70

Therefore, a 90% confidence interval for the population proportion is between 0.667 and 0.734.

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