Answered

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A nation-wide delivery company would like to estimate the proportion of packages that were delivered on time last month. To do so, they select a random sample of 120 packages that were delivered last month and examine tracking information to determine if they were delivered on time. They find that 87.5% of these packages were delivered on time. Construct and interpret a 95% confidence interval for the proportion of all packages that this company delivered on time last month.

Sagot :


PLAN: Select 3 true statements.


We have a random sample of 120 packages that were delivered last month


The sample size, 120, is less than 10% of all packages delivered last month.


The Random condition is not met.


One-sample interval for

The 10% condition is not met.


One-sample interval for
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