Archaeologists often find only parts of ancient human remains. for example, they may find a small finger bone, called the metacarpal bone. is it possible to predict the height of a human from the length of his or her metacarpal bone? to investigate, a researcher measures the heights and metacarpal lengths of 200 adults. in making the scatterplot, the researcher should
a. plot the height of the person on the horizontal axis.
b. plot the metacarpal length on the horizontal axis.
c. first determine if the heights of humans follow a normal distribution.
d. use a plotting scale that makes the overall trend roughly linear.

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.