Question

In statistics, what does df denote? If a simple random sample of 20 speeds of cars on California Highway 405 is to be used to test the claim that the sample values are from a population with a mean greater than the posted speed limit of 65 mi/h, what is the specific value of df? Choose the correct answer below. O A. df denotes the distribution of freedom. For this sample, df 20. O B. df denotes the number of degrees of freedom. For this sample, df=20. O C. df denotes the number of degrees of freedom. For this sample, df= 19 O D. df denotes the distribution of freedom. For this sample, df 19

Answer 1

Solution :

Given that,

sample size = n = 20

Degrees of freedom = n - 1 = 20 - 1 = 19

The correct option is : Option c