What is the purpose of a Chi-Square test?

To determine if there is a statistically significant difference between the observed and expected values in an experiment.

To determine if there is a significant difference between the observed and expected values in an experiment.

To conclusively prove that your null hypothesis is true or false.

Which of the following pieces of data is quantitative?

There were 7 heads and 3 tails when a coin was flipped 10 times.

A coin has a heads side and a tails side.

Which variable typically goes on the x-axis of a graph?

either independent or dependent

Students put two plants in the sun. Plant A is in the sun for 10 minutes. Plant B is in the sun for 1 hr. Students decide that plant B is better at photosynthesis. This is wrong because...

They didn't control all variables

The independent variable was sunlight

The dependent variable was amount of gas produced

they used different amounts of water

Students are growing plants in the dark or in the light to see which grows better. They put 3 seeds in the dark and 5 seeds in the light because they know seeds are more likely to dry out in the light. How could this experiment be improved?

Put the same number of seeds in each container.

Put all plants in the dark (where they sprout better)

put all the plants in the light so they grow better

How do you find critical value?

where degrees of freedom lines up with significance level (p-value)

where significance level (p-value) lines up with chi-square

the difference between total and chi-square

degrees of freedom minus significance level (p-value)

How do you find degrees of freedom?

total number of categories divided 2

total number of experiments times 2

The manager of a high school cafeteria is planning to offer several new types of food for student lunches in the following school year. She wants to know if each type of food will be equally popular so she can start ordering supplies. To find out, she selects a random sample of 100 students and asks them, "Which type of food do you prefer: Asian food, Mexican food, pizza, or hamburgers?" Here are the data in the table provided. The Chi-square value is 11. Which of the following is the most appropriate conclusion?

The chi-square value is greater than the critical value and the null hypothesis should be rejected. Students prefer some foods over others.

The chi-square value is less than the critical value and the null hypothesis should be rejected. Students prefer some foods over others.

Students do not prefer one food type over another as proven by the chi-square test.

Recent revenue shortfalls in a mid-western state led to a reduction in the state budget for higher education. To offset the reduction, the largest state university proposed a 25% tuition increase. It was determined that such an increase was needed simply to compensate for the lost support from the state. Separate random samples of 50 freshmen, 50 sophomores, 50 juniors, and 50 seniors from the university were asked whether they were strongly opposed to the increase, given that it was the minimum increase necessary to maintain the university's budget at current levels. The results are in the table provided. Which null hypotheses would be appropriate for performing a chi-square test to determine if students of a particular class are more opposed to the changes compared to other classes?

The null hypothesis is that the distribution of student opinion about the proposed tuition increase is the same for each of the 4 years at the university. The alternative is that the distribution is different for at least 2 of the 4 years.

The null hypothesis is that the closer students get to graduation, the less likely they are to be opposed to tuition increases. The alternative is that how close students are to graduation makes no difference in their opinion.

The null hypothesis is that the mean number of students who are strongly are opposed is the same for each of the 4 years. The alternative is that the mean is different for at least 2 of the 4 years.

The null hypothesis is that year in school and student opinion about the tuition increase in the sample are independent. The alternative is that these variables are dependent.

Experimental Design AP Biology

Authored by Nicole Karle

Biology

9th - 12th Grade

NGSS covered

Used 79+ times

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24 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes a hypothesis?

a complete guess

the variable that is being tested by the researcher

a testable explanation

a conclusive statement made based on experimental results

Tags

NGSS.HS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes an independent variable?

a testable explanation

the variable being tested

the variable being measured

the group that is a standard for comparison

Tags

NGSS.HS-LS1-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes a dependent variable?

a testable explanation

the variable being tested

the variable being measured

the group that is a standard for comparison

Tags

NGSS.HS-PS1-3

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes the control group?

the group that is the standard for comparison

the group that is used to test the effects of the independent variable

the variables that are kept the same for all groups

a testable explanation

Tags

NGSS.HS-LS1-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes the experimental group?

the group that is the standard for comparison

the group that is used to test the effects of the independent variable

the variables that are kept the same for all groups

a testable explanation

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes experimental constants or controls?

the group that is the standard for comparison

the group that is used to test the effects of the independent variable

the variables that are kept the same for all groups

a testable explanation

Tags

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many variables should be tested in an experiment?

as many as you need to test

Tags

NGSS.MS-ETS1-4

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Experimental Design AP Biology

Which of the following best describes a hypothesis?

Which of the following best describes an independent variable?

Which of the following best describes a dependent variable?

Which of the following best describes the control group?

Which of the following best describes the experimental group?

Which of the following best describes experimental constants or controls?

How many variables should be tested in an experiment?

What is the purpose of a Chi-Square test?

Which of the following pieces of data is quantitative?

An experimenter was testing the effect of light distance on the the number of oxygen bubbles produced by a photosynthesizing aquatic plant. The researcher counted the number of bubbles produced at 10 successive distances. What type of data is this? What type of graph should be used?

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