In a survey of 1000 us adults, twenty percent say they never exercise. this is the highest level seen in five years.1 find a confidence interval for the proportion of us adults who say they never exercise. round your answers to three decimal places.

Step-by-step explanation:

Given that in a survey of 1000 US adults, twenty percent say they never exercise. This is the highest level seen in five years

p = Sample Proportion of US adults who exercise = 20%=0.20

Std error of p=

Since sample size is large we can use Z critical for 95% confidence interval

Margin of error = ±1.96(0.01265)

=0.0248

Confidence interval for proportions =p±0.0248

=

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315

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