A random sample of n = 45 values give = 63. Can this sample be regarded as drawn from a
A normal population with mean μ = 70 and s2 =25?
Hypothesis
Since sample size we use the normal distribution table
Therefore
At a level of confidence, the sample mean can be concluded to be equal to the population mean if:
Since the Z value obtained is within the range i.e.
We conclude that the sample is from the normal population with mean = 70 and variance = 25
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