Use this table from the 2006 GSS to answer the following questions: RACE OF RESPONDENT Frequency ...

Use this table from the 2006 GSS to answer the following questions:
 
  RACE OF RESPONDENT
  Frequency Percent
  1 WHITE 3284 72.8
  2 BLACK 634 14.1
  3 OTHER 592 13.1
  Total 4510 100.0
  a. What is the standard error of the proportion white?

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The 2006 GSS asked respondents how many siblings they have. The mean number of
  siblings was 3.76 with a standard deviation of 3.178 . N=2,988 . Use this information
  to answer the following questions:
 
  a. What is the standard error of the mean?

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Suppose a sample of statistics students (N=30) has a distribution of grades with a
  mean of 70 and standard deviation of 15.
 
  a. What is the standard error of the mean?