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I need to know if my calculations are correct on the attached spreadsheet. I feel the calculations of margin of error and standard error of mean are incorrect which is making my upper and lower bound incorrect.

PayTime
22
19
16
18
13
16
29
17
15
23
18
21
16
10
16
22
17
25
15
21
20
16
15
19
18
15
22
16
24
20
17
14
14
19
15
27
12
17
25
13
17
16 95% CI Used
Population Standard Deviation
Sample Mean
Sample Size
Confidence Level
Standard Deviation 4.2
18.11
65
95%
3.96 Confidence Coff. Or Z Value
Margin of Error
Standard Error of Mean
Upper Bound
Lower Bound 1.96
1.02
0.13
19.13
17.09 Probability of observing a payment time of 65 invoices less th
Z Value for 18.11
P Value for 18.11 Column1
Mean
Standard Error
Median
Mode
Standard Deviation
Sample Variance
Kurtosis
Skewness
Range
Minimum
Maximum
Sum
Count 13
18
19
18
14
17
17
12
23
24
18
16
16
20
15
24
17
21
15
14
19
26
21 99% CI Used
Population Standard Deviation
Sample Mean
Sample Size
Confidence Level
Standard Deviation 4.2
18.11
65
99%
3.96 Confidence Coff. Or Z Value
Margin of Error
Standard Error of Mean
Upper Bound
Lower Bound 2.58
1.34
0.13
19.45
16.77 e of 65 invoices less than or equal to 18.1077 days with a population mean of 19.5 days
-1.36
0.09 Column1
18.1076923077
0.4913301593
17
16
3.9612303838
15.6913461538
0.033812161
0.6007990258
19
10
29
1177
65

 


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