Question

a pharmaceutical company claimed that experiments showed that its drug could effectively reduce the growth of cancer cells by 35 percent. however, when five independent laboratories conducted the same experiment, they measured a reduction rate of only 5 - 8 percent. how did these laboratories show that the pharmaceutical companys claims were invalid? the labs used the pharmaceutical companys inadequate data. the labs produced false data. the labs recorded data incorrectly. the labs were unable to reproduce the pharmaceutical companys data.

Explanation:

In scientific research, reproducibility is crucial. If multiple independent laboratories cannot reproduce the results (in this case, the reduction rate of cancer cell growth) claimed by the pharmaceutical company, it casts doubt on the company's claims. The other options (using inadequate data, producing false data, recording data incorrectly) are not supported by the information given. The key point is the inability to reproduce the data.

Answer:

The labs were unable to reproduce the pharmaceutical company’s data.