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Author Question: 400 patients suffering from chronic back pain were randomly assigned to one of two groups. Over a ... (Read 34 times)

deesands

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on: Jul 25, 2018
400 patients suffering from chronic back pain were randomly assigned to one of two groups. Over a four-month period, the first group received acupuncture treatments and the second group received a placebo.
 
  Patients who received acupuncture treatments improved more than those who received the placebo.
  A) Designed experiment B) Observational study

Question 2

A researcher wants to perform a hypothesis test to determine whether the mean length of marriages in California differs from the mean length of marriages in Texas. Identify the two populations for the proposed hypothesis test.
 
  A) Adults living in California and adults living in Texas
  B) Marriages in California and marriages in Texas
  C) Lengths of California marriages and lengths of Texas marriages
  D) Married men and married women


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Pariscourtney

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Reply #1 on: Jul 25, 2018
Answer to Question 1

A

Answer to Question 2

B


deesands

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Reply 2 on: Jul 25, 2018
Excellent

juliaf

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Reply 3 on: Yesterday
Wow, this really help

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