1)True or false: All processes have variation. 2)For a sampling distribution of
ID: 3021460 • Letter: 1
Question
1)True or false: All processes have variation.
2)For a sampling distribution of x¯ with Normal shape, what percentage of all possible x¯'s are between 3n and +3n?
3)Fill in the blank: If an x¯-value is less than 3n or greater than +3n, then we say that the process is __________
a) in control
b) out of control
4)True or false: An x¯-chart is like a scatterplot only with sample means plotted across time.
5)True or false: A process is declared to be out-of-control if nine sample means in a row are above the center line or if nine sample means in a row are below the center line in an x¯-chart.
6)For all sample sizes, when is the sampling distribution of x¯ exactly Normal?
7)When is the sampling distribution of x¯ approximately Normally distributed when sampling from non-Normal populations?
a. When the sample is a convenience sample.
b. When the sample is large and SRS.
c. When the sample is a voluntary response sample.
Explanation / Answer
1. TRUE.
2. Around 99.7%
3. OUT OF CONTROL. This means that the sample mean is too far from the mean.
4. TRUE.
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