The mean age when smokers first start is 15 years old with a population standard deviation of 1.9 years. A researcher thinks that smoking age has significantly decreased. A survey of smokers of this generation was done to see if the mean age has decreased. The sample of 30 smokers found that their mean starting age was 12.3 years old. What are the correct hypotheses? Họ: Select an answer O ? 9 years Hạ: Select an answer e ? O years The test is: O One-tailed Two-tailed

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The mean age when smokers first start is 15 years old with a population standard deviation of 1.9 years. A
researcher thinks that smoking age has significantly decreased. A survey of smokers of this generation was
done to see if the mean age has decreased. The sample of 30 smokers found that their mean starting age was
12.3 years old.
What are the correct hypotheses?
Họ: Select an answer
?
years
Ha: Select an answer
?
years
The test is:
O One-tailed
O Two-tailed
Transcribed Image Text:The mean age when smokers first start is 15 years old with a population standard deviation of 1.9 years. A researcher thinks that smoking age has significantly decreased. A survey of smokers of this generation was done to see if the mean age has decreased. The sample of 30 smokers found that their mean starting age was 12.3 years old. What are the correct hypotheses? Họ: Select an answer ? years Ha: Select an answer ? years The test is: O One-tailed O Two-tailed
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