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Normal distribution, standard deviation and mean

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True or false:

When the variable is normally distributed, the sample size is less than 30, and the population standard deviation is known, then the t distribution must be used to find confidence intervals for the mean.

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The expert examines the normal distribution, standard deviation and means. The solution answers the question(s) below.

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This statement is true. Note that when working out confidence intervals for the mean, you would use a t distribution when the sample size is ...

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