A polling company conducts an annual poll of adults about political opinions. The survey asked a random sample of 2354 adults whether they think things in the country are going in the right direction or in the wrong direction. 62% said that things were going in the wrong direction. Complete parts a and b below. a) Calculate the margin of error for the proportion of all adults who think things are going in the wrong direction for 95% confidence.
Added by David H.
Step 1
Given that the confidence level is 95%, the alpha value is 1 - 0.95 = 0.05. Since this is a two-tailed test, we divide alpha by 2 to get 0.025. Looking up this value in the standard normal distribution table, we find the critical z-value to be approximately 1.96. Show more…
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I need help with calculating margin of error. A polling company conducts an annual poll of adults about political opinions. The survey asked a random sample of 303 adults whether they think things in the country are going in the right direction or in the wrong direction. 51% said that things were going in the wrong direction. Calculate the margin of error for the proportion of all adults who think things are going in the wrong direction for 95% confidence
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