## Question 128:

1## Answer:

No answer provided yet.For a two-sided confidence interval, the critical value which you'd use, can be looked up by using a table of normal values or by inputting .70 in the percentile to z-score calculator to provide a z-score of 1.04.Note: z-scores are just another name for standard score. It refers to the number of standard deviations from zero in the standard normal curve. For more background on z-scores see the tutorials here.

See also the confidence interval tutorials on how the z-score gets used.