Finding zα/2
Note: zα/2 is a z-score corresponding to right-tailed area of α/2.


Input Level of Confidence:

Level of Confidence (%) =

          































































Calculating Mean and Standard Deviation

         How To Video

Input Data:(Use Tab or 'Arrow' keys on keyboard to help with data input.)
.................... Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 Column 8 Column 9 Column 10 Column 11 Column 12 Column 13 Column 14 Column 15 Column 16 Column 17 Column 18 Column 19 Column 20 Column 21 Column 22 Column 23 Column 24 Column 25 Column 26 Column 27 Column 28 Column 29 Column 30 Column 31 Column 32 Column 33 Column 34 Column 35 Column 36 Column 37 Column 38 Column 39 Column 40 Column 41 Column 42 Column 43 Column 44 Column 45 Column 46 Column 47 Column 48 Column 49 Column 50
Row 1
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Row 7
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Row 9
Row 10
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Row 12
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Row 14
Row 15
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Row 18
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Row 20
Row 21
Row 22
Row 23
Row 24
Row 25
Row 26
Row 27
Row 28
Row 29
Row 30
Row 31
Row 32
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Row 34
Row 35
Row 36
Row 37
Row 38
Row 39
Row 40
Row 41
Row 42
Row 43
Row 44
Row 45
Row 46
Row 47
Row 48
Row 49
Row 50
   or