Determine observational study or an experiment

Reference no: EM13112854

Arsenic is frequently found both in the natural environment and in food. A study of the relationship between arsenic in drinking water and deaths from lung cancer measured arsenic levels in drinking water in 138 villages in Taiwan and examined death certificates to identify lung cancer deaths. The study summary says that "arsenic levels above 0.64 mg/l were associated with a significant increase in the mortality of lung cancer in both genders, but no significant effect was observed at lower levels." Is this an observational study or an experiment? Fully explain your reasoning.

Reference no: EM13112854

Questions Cloud

Ammonium chloride added to water produce simple solution : Does ammonium chloride added to water produce a simple solution, does the ammounium chloride dissociate or does a chemical reaction occur resulting in a new set of compounds.

Statistics discussion questions : What are the theoretical considerations of hypothesis testing and why are these considerations important when conducting research studies?

Illustrate what internal or external factors might caused : Illustrate what internal or external factors might have caused those changes in the line items over the course of the year?

Drop in the pressure and temperature : determine volume it would have if it reaches an altitude where the temperature = -33 0C , pressure = 0.65 atm?

Determine observational study or an experiment : Significant increase in the mortality of lung cancer in both genders, but no significant effect was observed at lower levels." Is this an observational study or an experiment? Fully explain your reasoning.

Real life hypothesis example : There used to be an ad on TV that claimed one toothpaste was proven to be more effective in fighting tooth decay than another. One of statistics professors was interested in the study, and after 6 ads finally got the address to write away for it f..

Determine the pressure in the tank : A fifty litres container of stainless steel was charged with 5.00 atm of H2(hydrogen gas) and 6.00 atm of O2(oxygen gas). A spark ignited this mixture (hydrogen gas & oxygen gas)

Illustrate what is the crash cost and is the total project : If the management want to crash the cost to the maximum, which activities should be crashed, illustrate what is the crash cost and illustrate what is the total project cost?

Describing level of significance : When we say we have a confidence level of 95%, what do you think our "margin of error" is? If we move the level of confidence from 95 to 99%, what will happen to our margin of error? What will happen to the width of our confidence interval?

User Account

All Pages