If two independent large samples are selected from two ...

[jman1234]

If two independent large samples are selected from two populations, the sampling distribution of the difference between the two sample means _____.
 a. can be approximated by a Poisson distribution
  b. will have a variance of 1
  c. can be approximated by a normal distribution
  d. will have a mean of 1

Question 2

Independent simple random samples are selected to test the difference between the means of two populations whose standard deviations are not known. We are unwilling to assume that the population variances are equal. The sample sizes are n1 = 25 and n2 = 35 . The correct distribution to use is the t distribution with ______ degrees of freedom.
 a. 25
  b. 35
  c. 58
  d. The correct degrees of freedom cannot be calculated without being given the sample standard deviations.

[jxjsniuniu]

Answer to Question 1

c

Answer to Question 2

d

[jman1234]

Excellent

[nguyenhoanhat]

TYSM