QUESTION 13 True or false? External validity is often poor in randomized controlled trials because participants do not typically represent the general population. O True False QUESTION 14 is usually strong in RCTS because randomization reduces bias. Internal validity External validity O Blinding O Compliance QUESTION 15 True or false? The goal of randomization in RCTS is to make the treatment and control groups similar on all factors except the exposure. True False

QUESTION 13 True or false? External validity is often poor in randomized controlled trials because participants do not typically represent the general population. O True False QUESTION 14 is usually strong in RCTS because randomization reduces bias. Internal validity External validity O Blinding O Compliance QUESTION 15 True or false? The goal of randomization in RCTS is to make the treatment and control groups similar on all factors except the exposure. True False

Name: QUESTION 13True or false? External validity is often poor in randomiz
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Description: QUESTION 13True or false? External validity is often poor in randomized controlled trials because participants do not typically represent the generalpopulation.TrueFalseQUESTION 14is usually strong in RCTS because randomization reduces bias.Internal

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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You'd like to test if a sample of prisoners is more likely to have PTSD (diagnosed, not diagnosed) than a sample of non-incarcerated individuals. O One Sample Z test One Sample t test O Two Sample Z test O Independent two Sample t test Paired t test O One-way ANOVA Chi Square Test Pearson's Correlation Coefficient O Simple Linear Regression
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A medical researcher is working on a new treatment for a certain type of cancer. Theaverage survival time after diagnosis on the standard treatment is two years. In an earlytrial, she tries the new treatment on three subjects who have an average survival timeafter diagnosis of six years. Although the survival time has tripled, the results are notstatistically significant even at the 0.10 significance level. The explanation isA) the placebo effect is present, which limits statistical significance.B) the sample size is small.C) that although the survival time has doubled, in reality the actual increase is reallytwo years.D) the calculation was in error. The researchers forgot to include the sample size.
Three different treatments and four different methods are tested for their ability to control acne. What is the value of the LSD (0.05) for the comparison among method means? Treatment 1 Treatment 2 Treatment 3 SUMMARY Treatment 1 Count Sum Average Variance Treatment 2 Count Sum Average Variance Treatment 3 Count Sum Average Variance 3 Anova: Two-Factor With Replication Total Count Sum Average Variance Method 1 5 6 7 ANOVA Source of Variation Sample 6 2 Method 1 2 11 5.5 0.5 2 13 6.5 0.5 2 5 2.5 0.5 6 29 4.833 3.767 Method 2 6 SS 36,75 7 8 7 3 4 Method 2 2 13 6.5 0.5 2 15 7.5 0.5 2 7 3.5 0.5 6 35 5.833 3.767 df 2 Method 3 7 8 9 8 4 6 Method 3 2 15 7.5 0.5 2 17 8.5 0.5 2 10 5 2 6 42 7 3.2 MS 18.4 Method 4 8 9 6 5 6 7 Method 4 2 17 8.5 0.5 2 11 5.5 0.5 2 13 6.5 0.5 6 41 6.833 2.167 F Total 8 56 7 1.714 8 56 7 1.714285714 8 35 4.375 3.125 P-value 2:370761-05 F crit 3.89
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