Why do we divide the numerator by N-1 instead of N when calculating the standard deviation?    Group of answer choices a). To increase the sample size. b). To account for smaller samples having less dispersion. c). To reduce the discrepancy between the sample statistic and the population parameter. d). To make sure dispersion is centered around the mean.

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Why do we divide the numerator by N-1 instead of N when calculating the standard deviation? 
 
Group of answer choices
a). To increase the sample size.
b). To account for smaller samples having less dispersion.
c). To reduce the discrepancy between the sample statistic and the population parameter.
d). To make sure dispersion is centered around the mean.
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