Question 1010600
unless i'm missing something, you don't have a standard deviation.


the standard deviation from the population is required in order to use the z-score.


if you had the standard deviation from the population, then it would be appropriate to use the z-score.


if you had the standard deviation from the sample, then it would be appropriate to use the t-score.


without the standard deviation of either the population or the sample, you would not be able to use the z-score or the t-score.


check your problem and see if the standard deviation is supplied.


if from the population, then a z-score is justified.


if from the sample, then a t-score is justified.