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Point Estimate on Survey Results

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17. A Louis Harris poll used a survey of 1008 adults to learn about how people feel about the economy (Business Week,August 7, 2000). Responses were as follows:
595 adults The economy is growing.
332 adults The economy is staying about the same.
81 adults The economy is shrinking.

Develop a point estimate of the following population parameters.
a. The proportion of all adults who feel the economy is growing.
b. The proportion of all adults who feel the economy is staying about the same.
c. The proportion of all adults who feel the economy is shrinking.

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Solution Summary

This solution determines point estimates for the proportion of all adults who feel the economy is growth, staying the same and shrinking. All workings are shown with brief explanations.

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17. A Louis Harris poll used a survey of 1008 adults to learn about how people feel about the economy (Business Week,August 7, 2000). Responses were as follows:
595 adults The economy is growing.
332 adults The economy is staying about the same.
81 adults The economy is ...

Solution provided by:
Changping Wang, MA
Education
  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
  • "excellent work"
  • "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
  • "Thank you"
  • "Thank you very much for your valuable time and assistance!"
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