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Find themargin of error for the given values of c, s, and n. where c is the confidence interval, s is the sample standard deviation and n is the number of objects.

c=0.65 s= 1.5 n=50

the formula: E= (z

_{c}s) / n^.5

Level of Confidence Chart

c ........................z

_{c}

.80.......................1.28

.90.......................1.645

.95........................1.96

.99.........................2.575

As you can see, the z

_{c}value for c=.65 is not present on the chart. I don't know how to proceed to solve the problem by finding the corresponding z

_{c}for when c=.65. if anyone could show me, that would be appreciated.

thankx