If two independent large samples are taken from two populations, ...

[Brittanyd9008]

If two independent large samples are taken from two populations, the sampling distribution of the difference between the two sample means
 a. can be approximated by any distribution.
  b. will have a variance of one.
  c. can be approximated by a normal distribution.
  d. will have a mean of one.

Question 2

Two independent simple random samples are taken to test the difference between the means of two populations whose standard deviations are not known, but are assumed to be equal. The sample sizes are n1 = 25 and n2 = 35 . The correct distribution to use is the
 a. t distribution with 61 degrees of freedom.
  b. t distribution with 60 degrees of freedom.
  c. t distribution with 59 degrees of freedom.
  d. t distribution with 58 degrees of freedom.

[Laurenleakan]

Answer to Question 1

c

Answer to Question 2

d

[Brittanyd9008]

TYSM

[shewald78]

Excellent