IT company develops software for the hospitality sector. It tests its code using an industry standard software package. Aiming to expand its business and be more competitive in the sector, the company has decided to pilot an in-house 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. Table 1 Comparison of test times in minutes for the industry standard and in-house software testing packages

Test number Industry standard software package In-house software package

1 349 318

2 332 327

3 336 303

4 395 337

5 368 311

6 391 329

7 296 321

8 361 327

9 648 330

10 375 347

11 302 311

12 347 331

13 379 340

14 384 343

15 358 328

16 369 341

17 308 317

18 341 325

19 385 346

20 378 337

1. Which three types of investigation is this? Explain your answer briefly.
2. (ii) Are these primary or secondary data, from the researcher's point of view? Explain your answer briefly.
3. (b) Spend a few minutes scanning these datasets by eye.
4. (i) List any three features that you should be looking for when scanning datasets by eye. (ii) Comment on whether or not you think there might be a problem with any of the most extreme values in each column