Question

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The amount of nicotine, in milligrams,
in a cigarette of a certain brand is
normally distributed with mean u and
standard deviation 2.5. A random
sample of 10 cigarettes yielded a
mean nicotine value of 18.4. We test
the null hypothesis u = 17.8 against
the alternative hypothesis u 17.8 at
the 10 % significance level. The test
statistic is given as:​

Answer 1

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