Find df for determining mean weight of adult women

Reference no: EM13124044

A researcher believes that women today weigh less than in previous years. To investigate this belief, she randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs.

The df for determining tcrit =

A. 41
B. 40
C. 39
D. need more info

Reference no: EM13124044

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