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In a study of 135 women, roughly half took estrogen as well as calcium and vitamin D supplements and received regular checkups. The remaining women received the supplements and the checkups but substituted a sugar pill for the estrogen. Those who received the estrogen had an average 3.6 percent gain in bone density compared to a 0.2 percent bone density improvement in those taking the sugar pill. This study can best be described as a census a survey using quota sampling the placebo effect a controlled placebo experiment a survey using simple random sampling

In a study of 135 women, roughly half took estrogen as well as calcium and vitamin D supplements and received regular checkups. The remaining women received the supplements and the checkups but substituted a sugar pill for the estrogen. Those who received the estrogen had an average 3.6 percent gain in bone density compared to a 0.2 percent bone density improvement in those taking the sugar pill. This study can best be described as a census a survey using quota sampling the placebo effect a controlled placebo experiment a survey using simple random sampling

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 10CYU
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In a study of 135 women, roughly half took estrogen as well as calcium and vitamin D supplements and received regular checkups. The remaining women received the supplements and the checkups but substituted a sugar pill for the estrogen. Those who received the estrogen had an average 3.6 percent gain in bone density compared to a 0.2 percent bone density improvement in those taking the sugar pill. This study can best be described as

  • a census
  • a survey using quota sampling
  • the placebo effect
  • a controlled placebo experiment
  • a survey using simple random sampling
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