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prohojiy [21]
4 years ago
6

How many values are within two standard deviation of the mean

Mathematics
1 answer:
murzikaleks [220]4 years ago
3 0

Answer:

In statistics, the 68–95–99.7 rule, also known as the empirical rule, is a shorthand used to remember the percentage of values that lie within a band around the mean in a normal distribution with a width of two, four and six standard deviations, respectively; more accurately, 68.27%, 95.45% and 99.73% of the values lie ...

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Answer:

The test statistic (z-score) of this one-mean hypothesis test is z=1.823.

Step-by-step explanation:

The null and alternative hypothesis are:

H_0: \mu=150\\\\H_a: \mu\neq 150

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The z-score can be calculated as:

z=\frac{M-\mu}{\sigma/\sqrt{n}}=\frac{157-150}{18/\sqrt{22}}  =\frac{7}{3.84} =1.823

The test statistic (z-score) of this one-mean hypothesis test is z=1.823.

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