Standard Normal Distribution

Question

If we are testing for the difference between two population means and assume that the two populations have equal but unknown standard deviations, then the test has (n1 + n2 – 2) degrees of freedom.

Answer 

True
False 

Question

The pooled estimate of the proportion is found by dividing the total number of samples by the total number of successes.

Answer 

True
False

Question

When testing for a difference between the means of two dependent samples, n1 = n2.

Answer 

True
False

Question

The t distribution is more spread out and flatter at the center than the standard normal distribution. However, as the sample size increases, the t distribution curve approaches the standard normal distribution.

Answer 

True
False

Question

A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a population standard deviation of 3 hours, what is the required sample size if the error should be less than ½ hour with a 99% level of confidence?

Answer 

196

240

15

16

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