Question

Given the sample data.x: 21, 19, 13, 30, 27 (a) Find the range. (Enter an exact...

Given the sample data.x:

  • 21,
  • 19,
  • 13,
  • 30,
  • 27

(a)

Find the range. (Enter an exact number.)

(b)

Verify that Σx = 110 and Σx2 = 2,600. (For each answer, enter an exact number.)
Σx =   
Σx2 =   

(c)

Use the results of part (b) and appropriate computation formulas to compute the sample variance s2 and sample standard deviation s. (For each answer, enter a number. Round your answers to two decimal places.)
s2 =   
s =   

(d)

Use the defining formulas to compute the sample variance s2 and sample standard deviation s. (For each answer, enter a number. Round your answers to two decimal places.)
s2 =   
s =   

(e)

Suppose the given data comprise the entire population of all x values. Compute the population variance σ2 and population standard deviation σ. (For each answer, enter a number. Round your answers to two decimal places.)
σ2 =   
σ =  

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