sample of n = 20 with M = 34 and s2 = 36 from an unknown population. What is the df value for the t statistic?   Group of answer choices df = 19 df = 35 df = 21 df = 37

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sample of n = 20 with M = 34 and s2 = 36 from an unknown population. What is the df value for the t statistic?
 
Group of answer choices
df = 19
df = 35
df = 21
df = 37
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