Your sample is normally distributed with a mean age of 57. The standard deviatio
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Your sample is normally distributed with a mean age of 57. The standard deviation in this sample is 5 years The 2000 census shows your sample is older than a randomly selected national sample You would expect 68% of your subjects to be younger than the national sample between the ages of 52 and 62 between 56 and 58 older than the national sample Your intervention measured blood pressure at the beginning of an office visit on three occasions. Repeatmg the measurement of this variable gives you more information about the: divergent validity content validity level of measurement stability The standard deviation is calculated in order to determine: the meanExplanation / Answer
10) Our sample has a Normal(mu = 57, sigma2 ) distribution.
The sample standard deviation is S=5 .
The 2000 census shows our sample is older than a randomly selected national sample.
We would expect 68% of our subject to be around the mean mu=57.
Then, a 68% Confidence Interval around the mean is
= [mu- tau0.16 * s , mu+ tau0.16 * s]
=[57-1* 5 , 57+1* 5]
=[ 52, 62]
Therefore, we would expect 68% of our subjects to be between the ages of 52 and 62.
11) Repeating measurements on a variable gives us more accurate measure because as the repetition increases, the confidence interval gets narrower.
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