Question

In a random sample of 200 residents of Los Angeles, 140 residents indicated that they voted for the Democratic candidate in the last presidential election. a. Compute the standard error of proportion. b. At 95% confidence, compute the margin of error. c. Develop a 95% interval estimate for the proportion.

Name: in a random sample of 200 residents of los angeles 140 residents indicated that they voted for the democratic candidate in the last presidential election a compute the standard error of prop 52962
Uploaded: 2022-08-18T02:09:07-08:00
Duration: 3 min 42 s
Channel: Robin Corrigan
Description: in a random sample of 200 residents of los angeles 140 residents indicated that they voted for the democratic candidate in the last presidential election a compute the standard error of prop 52962

          In a random sample of 200 residents of Los Angeles, 140
residents indicated that they voted for the Democratic candidate in
the last presidential election.
a. Compute the standard error of proportion.
b. At 95% confidence, compute the margin of error.
c. Develop a 95% interval estimate for the proportion.

Added by Kelsey G.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Robin Corrigan

08/18/2022

Step 1

Given: Sample proportion (p) = 140/200 = 0.7 Sample size (n) = 200 Standard error = sqrt(p*(1-p)/n) Standard error = sqrt(0.7*0.3/200) Standard error = sqrt(0.0021) Standard error ≈ 0.0458 ** Show more…

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In a random sample of 200 residents of Los Angeles, 140 residents indicated that they voted for the Democratic candidate in the last presidential election. a. Compute the standard error of proportion. b. At 95% confidence, compute the margin of error. c. Develop a 95% interval estimate for the proportion.