Question

Given the sample data.

x:

• 21,
• 19,
• 13,
• 32,
• 27

(a)

Find the range. (Enter an exact number.)

(b)

Verify that Σx = 112 and Σx² = 2,724. (For each answer, enter an exact number.)
Σx =  

(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.)
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 =  

Answer 1