I asked this question two time already. last time I missed to write the last part.

Can someone please explain me in detail. just don't need the answer as this question killing me :-)

Here is the link for the pages 177 - 9 which is mentioned in the question. link = http://roshaaztech.com/file/mu123_booka_unit4_e2i1.pdf

Question:

An IT company develops software for the hospitality sector. It tests its code using an industry standard software package. Aiming to expand their

business and be more competitive in the sector, the company has decided to pilot an inhouse software package to test its code. A company researcher wishes to compare the times taken for each package to complete tests. Both software packages were run on 20 occasions testing the same code. The researcher records the times taken on each occasion and these are shown in Table 1.

\f\fIndustry standard software package With typing error With correct value Mean 370.1 355.1 Median 363.5 359.5 Size of dataset 20 20