Calculated Confidence Intervals

04272023, 02:23 PM
Post: #1




Calculated Confidence Intervals
How does one do a z or test/confidence interval without the standard deviation? (given only the mean/proportion and sample size)
This can be done on other calculators, like the TI84, and I wonder how it can be done here. Thanks. 

05082023, 07:17 AM
Post: #2




RE: Calculated Confidence Intervals
I believe you can use the Inference app for this.
Method: confidence interval Type: ZInt: 1 π Press [num] x  success count (if given proportion of successes, p*n approx = x) n  sample size C  confidence level Then press the Calc key on screen. Lower/Upper is the CI. Alternatively you can use the command ConfZ1prop(SuccCount, SampSize, ConfLevel), which returns a list of 4 values: {Lower critical value, lower bound, upper bound, calculated proportion}.  neek 

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