Inference on proportions, ACT, Inc. In 2004, ACT, Inc.

Inference on proportions

Reference no: EM131008860

ACT, Inc. In 2004, ACT, Inc. reported that 74% of 1644 randomly selected college freshmen returned to col- lege the next year. Estimate the national freshman-to- sophomore retention rate.

a) Check that the assumptions and conditions are met for inference on proportions.

b) Construct a 98% confidence interval.

c) Interpret your interval.

d) Explain what "98% confidence" means in this context.

Reference no: EM131008860

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