STATS 230 QUIZ 3 Complete Solution
STATS 230 Quiz 3 Complete Solution
Population Sd = SE*√(Sample size)
Population variance = SE^2*sample size=5*25=125
Variance of the sample distribution of the mean if we randomly select 50 students is,
Variance = (Population variance)/(Sample size)=125/50=2.5
Imagine for the national college admission test, women had a mean score of 70 and a variance of 16; men had a mean score of 69 and a variance of 25. If we sample 50 scores from women and 50 scores from men, what’s the standard error of sample distribution of the difference between means? (Show work)
Assuming the variances are unequal the required standard error is,
SE = √(16/50+25/50)=0.9055
Imagine that the correlation between years of education and income in a population was 0.55. Imagine we sampled 19 peopl...
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