Lebo claims that workers in large companies are less work

motivated than workers in small companies. In a previous study involving all

large companies in South Africa, it was found that the average workers’

motivation score on a work motivation questionnaire (where a higher score

indicates a higher level of work motivation) was 50 with a standard deviation

of 15. Lebo plans to present the same questionnaire to a sample of workers from

small companies to determine whether her suspicion is true.

After Lebo collected the

responses on the work motivation questionnaire for an appropriate sample of 100

workers from small companies, she calculates the following sample parameters:

        Sample

size: n = 100

        Mean

motivation score for small companies:

        Standard

deviation of the motivation score for small companies: s = 12.5

Since the mean and standard

deviation for large companies are given (as 50 and 15 respectively), Lebo

decides to use a single-sample z-test (i.e. the z

Which of the following are

closest to the calculated value of this statistic?