Question: Be sure to determine correctly whether the confidence intervals are calculated with the normal distribution or the t distribution. A survey was conducted to estimate

Be sure to determine correctly whether the confidence intervals are calculated with the normal or the t survey was conducted to estimate the annual income of CEOs of large corporations. Twenty companies were surveyed and the mean income for this group was $220,000 with a standard deviation of $21,000, and the of this group appeared normal. Construct the 99% confidence interval for the mean annual income of all CEOs of large corporations.

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