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In a survey of 2283 adults 714 say they believe in UFOs construct a 90% confidence...


In a survey of 2283 adults 714 say they believe in UFOs construct a 90% confidence interval for the

Math   Statistics-And-Probability   
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Solution: In a survey of 2283 adults 714 say they believe in UFOs. Construct a 90% confidence interval for the population proportion.

Answer: The 90% confidence interval is given below:

Where:

is the sample proportion who believe in UFOs and is

is the critical value at 0.1 significance level and can be found using the standard normal table.

Now, we have:

rounded to two decimal places.

Therefore, the 90% confidence interval for the population proportion is

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