Does the mean of a normal distribution is always positive? How about the standard deviation?
1 answer:
Answer:
Mean of a Normal Distribution:
The mean of normal distribution is not always positive, it is equally distributed around mean,mode and median and can be any value from ranging from negative to positive to infinity.
Standard Deviation:
For the standard deviation, it can not be negative. It can only be equal to any positive values i.e., values .
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Thus, the appropriate test statistic is given by:
At 10% level of significance, the rejection region is given by
where:
for 10% level of significance is 1.65
Since z = 1.66 >
, we reject the null hypothesis, which means that <span>the traffic control strategy does not reduce carbon monoxide concentrations by at least 2 ppm.</span>
Thus, the appropriate test statistic is given by:
At 10% level of significance, the rejection region is given by
where:
Since z = 1.66 >