An independent samples t Test with a sample size of 50 will have 48 degrees of freedom. (True or false?)

An independent samples t Test with a sample size of 50 will have 48 degrees of freedom.
 
  Indicate whether the statement is true or false

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Suppose a survey is conducted of all of the licensed therapists in Illinois regarding their attitudes about evidence-based practice. If the survey seeks to generalize about therapists' attitudes nationwide, then for this study the survey participants comprise a:
 
  a. Population.
  b. Sample.
  c. Both a population and a sample
  d. Neither a population nor a sample

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If one group has a significant change in a paired-samples t-Test, and another group does not in its (separate) paired-samples t-Test, that signifies a significant difference between the groups.
 
  Indicate whether the statement is true or false