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When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A...

When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A sample of 70 smokers has a mean cotinine level of 172.3 ng/ml and a stadard deviation of 118.2 ng/ml. What is the value of the test statistic when testing the claim that the mean cotinine level of all smokers is less than 200.0 ng/ml at the significance level 5%?

Select one: a. -1.64 b. 1.64 c. None of the other answers is neccessary true. d. -1.96 e. 1.96

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

Solution,

The null and alternative hypothesis is ,

H0 :   = 200

Ha : < 200

= 172.3

= 118.2

n = 70

Test statistic = z =

= ( - ) / / n

= (172.3 - 200) / 118.2 / 70

Test statistic = z = -1.96

correct option is = d

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