In a second grade class containing 13 girls and 9 boys, 2 students are selected at random to give out the math papers. What is t
2 answers:
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<h2>The value of StartFraction 6 Over x EndFraction + 2x2, when x = 3 is 20.</h2>
Explanation:
The given expression is
When x = 3, the expression becomes
= 2 + 18 = 20
Answer:
As the sample size increases, the variability decreases.
Step-by-step explanation:
Variability is the measure of actual entries from mean. The less the deviations the less would be the variance.
For a sample of size n, we have by central limit theorem the mean of sample follows a normal distribution for random samples of large size.
X bar will have std deviation as
where s is the square root of variance of sample
Thus we find the variability denoted by std deviation is inversely proportion of square root of sample size.
Hence as sample size increases, std error decreases.
As the sample size increases, the variability decreases.