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A survey of annual earnings of UCLA students, showed the following data: ?̅ = $34,000, s=$1,400....

A survey of annual earnings of UCLA students, showed the following data: ?̅ = $34,000, s=$1,400. Size of the survey (n) was 50 students.

1) Construct a 98% confidence interval for the mean using the above data.

2) Change the confidence level to 90% and construct a confidence interval.

3) Use the .98 confidence level and increase the “n” to 576 to find the confidence interval

4) What do you notice about the range of the Confidence interval when n is increased

5) If allowable error is ±50, find the minimum sample size at the .95 confidence level

Math   Statistics-And-Probability   
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