The normal approximation to the sign test is acceptable if the sample size exceeds 15. (True or false?)

The normal approximation to the sign test is acceptable if the sample size exceeds 15.
 
  Indicate whether the statement is true or false

Q. 2

The estimate of the level for week 2 is:
 
  A) 452 units.
  B) 347 units.
  C) 335 units.
  D) 310 units.

Q. 3

The standard deviation of the households' monthly income is:
 
  A) 12.817
  B) 14.667
  C) 15.679
  D) 11.990

Q. 4

What is the sample variance of the Group 1?
 
  A) 345.98
  B) 234.56
  C) 366.01
  D) 255.89

Q. 5

The method for determining the number of degrees of freedom for the chi-square distribution depends on the type of test being done.
 
  Indicate whether the statement is true or false

Q. 6

Determine the marginal probability distributions of X and Y.
 
  What will be an ideal response?