Answer to Question #347555 in Statistics and Probability for Samuel

Question

The average weekly earnings of a production worker in 2000 were AUD421

421. Suppose a labor researcher wants to test to determine whether this figure is still accurate today.

The researcher randomly selects 56

56 production workers and obtains a representative earnings statement for one week from each. The resulting sample average is AUD434.3

434.3.

Assuming a population standard deviation of AUD31.8

31.8, and a 5% level of significance, determine whether the mean weekly earnings of a production worker have changed.

Determine the critical value zc and z score value z based on the sample data.

The critical value zc =

 

The z score value z based on the sample data =

Answer 1

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