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According to a Pew Research Center nationwide telephone survey of adults conducted March 15 to April 24, 2011, 69% of college graduates said that their college education gave them maturity (Time, May 30, 2011). Suppose that this survey included n=1490 college graduates.
a. What is the point estimate of the corresponding population proportion?
p^= .69
b. Construct a 98% confidence interval for the proportion of all college graduates who will say that their college education gave them maturity. What is the margin of error for this estimate?
Round your answers to three decimal places.
The confidence interval is _____ to ______
The margin of error is E = _______
Point estimate:
It is defined as the numeric value that provides estimate of value of the population. It is generally computed using the data of sample in order to get the idea about the parameter of interest by the researcher.
Following are the main point estimates that are used in Statistics to get the idea about the population:
Sample mean
Sample proportion and so on
Sample proportion is computed by taking the ratio of number of successes and total number of trial.
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