A class was performing an experiment to discover the pH values of some common household substances. The results of three groups are shown in the table below.

Substance

Group 1 pH

Group 2 pH

Group 3 pH

Lemon juice

2.2

2.2

2.1

Vinegar

2.8

2.8

8.2

Baking soda

8.4

8.5

8.4

Milk of magnesia

10.2

10.3

10.2

Which statement best describes evidence that Group 3's data are less valid than the data for the other two groups?

Group 3's pH value for lemon juice is lower than the values of the other two groups.

Group 3's pH value for vinegar is much higher than the values of the other two groups.

Group 3's pH value for baking soda does not exactly match the values of the other two groups.

Group 3's pH value for milk of magnesia is different from the value obtained by Group 2.

Question

Biology

Heidi Chavez

19 January, 11:40

A class was performing an experiment to discover the pH values of some common household substances. The results of three groups are shown in the table below.

Substance

Group 1 pH

Group 2 pH

Group 3 pH

Lemon juice

2.2

2.2

2.1

Vinegar

2.8

2.8

8.2

Baking soda

8.4

8.5

8.4

Milk of magnesia

10.2

10.3

10.2

Which statement best describes evidence that Group 3's data are less valid than the data for the other two groups?

Group 3's pH value for lemon juice is lower than the values of the other two groups.

Group 3's pH value for vinegar is much higher than the values of the other two groups.

Group 3's pH value for baking soda does not exactly match the values of the other two groups.

Group 3's pH value for milk of magnesia is different from the value obtained by Group 2.

+5

Answers (1)

Know the Answer?

Ryker Yu · Answer 1

Validity is the extent to which a measurement is corresponds to the real or actual value.

So " Group 3’s pH value for vinegar is much higher than the values of the other two groups." is the answer since 8.2 is so far from 2.8 which the other two groups got and seems to be valid.