Find the critical z-value for a 97.8% confidence interval. (Round your solution to 4 decimal places)

2.29

Step-by-step explanation:

The critical z-value for confidence level is given by :

i.e. the two tailed z-value .

Significance level for 97.8% confidence level = 1-0.978 = 0.022

Now, required critical value =  [From z-table]

Hence, the critical z-value for a 97.8% confidence interval = 2.29

its totaly b

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