Analyzing Evidence Answers

The scientific evidence that scientists use in supporting or critiquing the conclusions of experiments usually consists of

Penny measured the time that it took her rat to run through a maze. She conducted the experiment 10 times and recorded the set of data below.Times: 67 s, 69 s, 68 s, 66 s, 78 s, 70 s, 67 s, 69 s, 68 s, 66 sWhich time is most likely an outlier?

A scientific argument will be considered invalid if the evidence supporting that argument is based on

One way to get consistent, valid data is to

Dawn recorded her measurement of the mass of a sample of leaves as 13 grams (g). Four of her classmates measured the same sample and recorded the following data: 30 g, 31 g, 29 g, and 30 g. All students used the same balance during the same class period. Dawn’s data are most likely inconsistent due to

To critique scientific arguments and increase the validity of scientific evidence, scientists

Medical researchers often test medicines on patients who have given informed consent for the tests. The researchers divide the patients into two groups. One group is given the medicine. The second group is given a harmless substitute such as sugar pills. Neither the patients nor the researchers know which patients have received the medicine and which have received the substitute. What is the purpose of having neither the patients nor the researchers know who is receiving which treatment?

In which way could the results of an experiment have bias?

Poor measurement practices are likely to lead to data that are

Yannick’s class measured the width of one leaf several times. The values that the class recorded included 10 mm, 8 mm, 15 mm, 5 mm, and 13 mm. What is lacking from the measurements that the class made?