LT 4.1 Day 1 Data Collection, Good and Bad

For two months, three watermelon plants are given regular tap water, and three are given distilled water. Their growth rates and overall sizes are recorded weekly.

• This is an experiment.
• This is an observational study.

You want to find out student opinions on the location for the prom. What should you use?

• A survey.
• An observational study.
• An experiment.
• A simulation

You are trying to determine if pregnancy affects sleep levels. What is the best method?

• A survey
• An observational study.
• An experiment.
• A simulation

When one examines the entire population instead of a subgroup of the population, this is called a ____________.

• Sampling
• Census
• Bias

Researchers have linked an increase in the incidence of breast cancer in Italy to dioxin released by an industrial accident in 1976. The study identified 981 women who lived near the site of the industrial explosion and were under age 40 at the time. Fifteen of the women had developed breast cancer, at an unusually young average age of 45. Medical records showed that these women had heightened concentrations of dioxin in their blood, and that each 10-fold increase in dioxin level was associated with a doubling of the risk of breast cancer. (Science News, Aug. 3, 2002)

• Observational Study
• Experiment

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.ID.C.9

A radio talk show invites listeners to call a telephone number to vote "Yes" or "No" on whether they support a bond issue for anew school. About 1500 people call in. Over 80% say "No." As an estimate of community opinion, this result is

• accurate to within 3% with 95% confidence.
• not precise because the sample size 1500 is too small.
• unethical due to lack of informed consent.
• badly biased due to voluntary response.

What can you do to reduce the margin of error?

• increase the confidence level

• decrease the confidence level

• increase sample size

• decrease sample size

Name the type of bias. Some individuals refuse to give information.

• Wording of the question

• Response Bias

• Nonresponse Bias

• Undercoverage

Name the type of bias. A group from the population is left out of the sample

• Wording of the question

• Response Bias

• Nonresponse Bias

• Undercoverage

A sample that is not representative of the population is considered __________________.

• Systematic

• Equally likely

• Stratified

• Biased