Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.

Lesson: Identifying the Study Types That Can Be Used to Collect Sample Information

Worksheet • 8 Questions

Q1:

Which of the following statements is NOT true?

  • AObservational studies most often allow cause and effect to be established.
  • BIn an experiment, a treatment is performed on subjects to measure its effect.
  • CIn an experiment, the variables are controlled.
  • DWell-designed experiments allow cause and effect to be established.
  • EIn an observational study, the variables are observed and recorded.

Q2:

A large garden furniture seller wants to compare the resistance of two of their product lines in real use conditions. They decide to produce a random sample from their client database and ask them about the conditions of their garden furniture while recording the time of their purchase. Which of the following is probably NOT a confounding variable?

  • Amonth in which the furniture was purchased
  • Bclimate in which the furniture is kept
  • Cnumber of people in the household
  • Dage of the people in the household
  • Ehow clients store their garden furniture in winter

Q3:

Is the following a survey, an observational study, or an experiment?

A company has developed nontoxic oil paints. To investigate whether this new, environment-friendly product has attracted new clients, client and sale data were analyzed.

  • Aexperiment
  • Bobservational study
  • Csurvey

Q4:

Is the following a survey, an observational study, or an experiment?

A company has developed nontoxic oil paints. To investigate whether the paint adhesion depends on the roughness of the surface to be painted, they produced different samples of different roughness levels, painted the surface, and evaluated the paint adhesion with a paint scrape adhesion test.

  • Aobservational study
  • Bexperiment
  • Csurvey

Q5:

A negative correlation has been observed between the number of pirates in the world and the global average earth temperature; that is, the fewer pirates there are, the colder the earth's temperature.

Do you believe one can conclude that the decline in the number of pirates causes global warming?

  • Ayes
  • Bno

Which of the following could be the lurking variable here?

  • Atime
  • Bglacier melt
  • Cregion of the world
  • Ddeforestation
  • Eclimate

Q6:

Is the following a survey, an observational study, or an experiment?

To investigate whether the curing effect of a given drug depends on gender, two randomly selected groups of boys and girls were given this drug while two other randomly selected groups of boys and girls were given a placebo.

  • Asurvey
  • Bexperiment
  • Cobservational study

Q7:

Is the following a survey, an observational study, or an experiment?

To investigate whether the ability to memorize text depends on gender, two randomly selected groups of boys and girls were given the same text to memorize. After 15 min, they were asked to reproduce the text in writing and their productions were evaluated.

  • A survey
  • B observational study
  • C experiment

Q8:

Identify whether the following study is a survey, an observational study, or an experiment.

Specially designed multifocal contact lenses have been shown to reduce the progression of nearsightedness in children. To investigate whether the obtained results depend on the age at which nearsighted children start wearing the contact lenses, a group of opticians analyzed their patient databank in terms of the age children started wearing the contact lenses and the progression of their nearsightedness after five years compared with nearsighted children who wore only glasses.

  • A Experiment
  • B Observational study
  • C Survey
Preview