Methods of Data Collection

Determine whether the situation is an example of an experiment or an observational study. Henna wants to know whether copper coated cookware cooks food more evenly than plain stainless steel cookware. While preparing a large mean, she cooks one dozen eggs using the copper cookware and another dozen using stainless steel.

• Observational study because she gathers data without controlling individuals or applying a treatment

• Observational study because she applies a treatment to some individual

• Experiment because she applies a treatment to some individuals

• Experiment because she gathers data without controlling individuals or applying a treatment

A group researching dental health instructs a group of 100 people to brush twice a day for at least 2 minutes each time. Another 100 people were told to keep their usual brushing habits. After 6 months those who were told to brush for two minutes twice a day were significantly less likely to have cavities than those told to brush as usual. What is the control group?

• 200 people in the study

• 100 people told to keep their brushing habits

• 100 people told to brush twice a day for 2 minutes

A group researching dental health instructs a group of 100 people to brush twice a day for at least 2 minutes each time. Another 100 people were told to keep their usual brushing habits. After 6 months those who were told to brush for two minutes twice a day were significantly less likely to have cavities than those told to brush as usual. What is the treatment group?

• 100 people keeping their brushing habits

• The 200 people in the study

• 100 people brushing twice a day for two minutes

Tags

CCSS.HSS.IC.B.3

A store owner wants to know if he sells more water or sports drinks. He records the number of sales for both products. What is the data gathering technique used: sample survey, experiment, or observational study?

• Sample Survey

• Experiment

• Observational Study

A nutritionist wants to know if taking vitamins keeps people from getting colds. She gives 100 people a vitamin supplement for 2 months, and compares the results to 100 people who do not take vitamins. Determine whether the situation is an example of an experiment or an observational study.

• Observational study because she changed a variable

• Observational study because she did not change a variable

• Experiment because she changed a variable

• Experiment because she did not change a variable

An educator wants to compare the effectiveness of computer software that teaches reading with that of a standard reading curriculum. He tests the reading ability of each student in a class of fourth graders, and then randomly divides them into two groups. One group uses the computer regularly, while the other studies a standard curriculum. At the end of the year, he retests all students and compares the increase in reading ability in the two groups. What is the response variable?

• The effectiveness of computer software

• The effectiveness of standard reading curriculum

• Difference in the ability to read in the 2 groups

• Students in the first group

Tags

CCSS.6.SP.A.3

An educator wants to compare the effectiveness of computer software that teaches reading with that of a standard reading curriculum. He tests the reading ability of each student in a class of fourth graders, and then randomly divides them into two groups. One group uses the computer regularly, while the other studies a standard curriculum. At the end of the year, he retests all students and compares the increase in reading ability in the two groups. What is the explanatory variable?

• The difference in the reading abilities of his students

• The group with the standard curriculum

• Method of curriculum (computer vs standard)

• The group with the computers

Tags

CCSS.HSS.IC.B.3

Explain if the situation is an observational study or an experiment. A researcher asks people how many hours they exercise per week and examines if this affects the amount of sleep they get.

• Experiment because they apply a treatment

• Observational study because he gathers data instead of applying a treatment

• Experiment because he is gathering data instead of applying a treatment

• Observational study because he is applying a treatment

Tags

CCSS.HSS.IC.B.3

A student wants to know what his classmates think of the school schedules. He asks every 5th person who walks into school their opinion. This is an example of...

• Experiment

• Observational Study

• Sample Survey

A ______ is something a control group could be given in an experiment

Tags

CCSS.RI.11-12.3

CCSS.RI.11-12.5

CCSS.RI.8.3

CCSS.RI.9-10.3

CCSS.RI.9-10.5