Determine if the following statements are true or false. a) As the number of deg
ID: 3217374 • Letter: D
Question
Determine if the following statements are true or false.
a) As the number of degrees of freedom increases, the t-distribution approaches normality (i.e., approaches the normal distribution).
b) We use a pooled standard error for calculating the standard error of a difference of two means when the sample sizes of both groups are equal to each other.
c) When comparing means of two samples where n1 = 20 and n2 = 40, we can use the normal distribution model for the difference in means because n2 30.
a) As the number of degrees of freedom increases, the t-distribution approaches normality (i.e., approaches the normal distribution).
b) We use a pooled standard error for calculating the standard error of a difference of two means when the sample sizes of both groups are equal to each other.
c) When comparing means of two samples where n1 = 20 and n2 = 40, we can use the normal distribution model for the difference in means because n2 30.
Explanation / Answer
a) true
b) False
We use pooled when variance of two populations are same.
c)False
We an use the normal distribution model if the population sigma is known.