Question

1. Consider an experiment where 10 mice were exposed to radiation from cell phones, and 10...

1.

Consider an experiment where 10 mice were exposed to radiation from cell phones, and 10 mice were not. Whether or not the mice got cancer was observed for the two groups. Which is the independent variable?

The number of mice

The mice that received the radiation

Whether or not the mice got cancer

Whether or not the mice were exposed to radiation

2.

Discrete variables can be:

Easily counted

Made up of partial numbers or fractions

Both a and b

None of the above

3.

Continuous variables are:

Measured, not counted

Can be made qualitative, if categories are determined

Both a and b

None of the above

4.

Consider a study where we use a person's education level to to predict how much money they have invested. What type of variable is the dependent variable?

Binary

Discrete

Continuous

Qualitative

5 .

Choose the variable(s) which is/are best described as qualitative:

Height (in inches)

Eye color

Number of siblings

IQ score

Type of vehicle owned

6.

Consider an experiment where 10 mice were exposed to radiation from cell phones, and 10 mice were not. Whether or not the mice got cancer was observed for both groups. Check all that apply. The variable of whether or not the mice got cancer is

Qualitative

Continuous

Dependent

Independent

Quantitative
Math   Statistics-And-Probability   
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Homework Answers

Answer #1

1. Ans- Whether or not the mice got cancer is obviously independent variable.

2. Ans- Both a and b. Discrete variable can take any values but cannot take range of values.

3. Ans- Both a and b. Continuous variable cannot be counted and it can be made qualitative if categories can be determined.

4. Ans- Discrete. The amount of money a person has invested is dependent on his education level. So the amount of money they invested is dependent variable. It can be a particular value and discrete in nature.

5. Ans- Eye color and Type of vehicle owned. They are qualitative as they are non numeric.

6. Ans- Qualitative and independent. Whether a mice got cancer or not results in "Yes" or "No" choice and hence qualitative. The cancer criteria is independent of cell phone radiation.

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