Which of the following tests are used to test the difference between two independent groups?

Correlation

Student's t-test

Paired t-test

Standard error

   

T tests assume the population is ________ distributed

Negatively Skewed and

Widely

Normally

Evenly

Positively Skewed and

As the size of the sample increases, what happens to the shape of the sampling distribution of sample means?

A. It becomes negatively skewed.

B. It becomes uniformly distributed.

C. It becomes positively skewed.

D. It becomes approximately normal.

As the size of the sample increases, what happens to the shape of the sampling means?

A) Cannot be predicted in advance
B) Approaches a normal distribution
C) Positively skewed
D) Negatively skewed

Which of the following is true about sampling distribution?

• Shape of the sampling distribution is always the same shape as the population distribution ,no matter what the sample size is 
• Sampling distributions are always nearly normal.
• Sampling distributions of the mean is always right skewed since means cannot be smaller than 0
• Sampling distribution get closer to normally as the sample size increases