ECON2122 - Chapter 678 - Review

The variance of the sampling distribution of the sample mean is equal to the variance of the population mean divided by the square root of the sample size

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The length of time it takes to fill an order at a local sandwich shop is normally distributed with a mean of 4.1 minutes and a standard deviation of 1.3 minutes.

What is the probability that the average waiting time for a random sample of ten customers is greater than 4 minutes.

(Provide the equivalent Z problem only)

When computing the confidence interval for the population proportion, the Student's t-distribution is used rather than the normal distribution.

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As the confidence level for a confidence interval increases, the width of the interval also increases.

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• a normal distribution

• a binomial distribution

• the Poisson distribution

• a chi-square distribution