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The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of
9.3mg and a standard deviation of 1.55mg. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. The supporting evidence consists of a
sample of 45 cigarettes with a mean nicotine amount of 8.861mg.
Assuming that the given mean and standard deviation have NOT changed, find the probability
of randomly seleting 45 cigarettes with a mean of 8.861mg or less.
P(M<8.861mg)=
Based on the result above, is it valid to claim that the amount of nicotine is lower?
No. The probability of obtaining this data is high enough (not significantly low) to have
been a chance occurrence.
Yes. The probability of this data is unlikely (significantly low) to have occurred by chance
alone.
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Question 10
0/1 pt D3 19 ODetails
Use StatCrunch
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 9.3 mg and a standard deviation of 1.55 mg. The company that produces these cigarettes claims that it has now reduced the amount of nicotine. The supporting evidence consists of a sample of 45 cigarettes with a mean nicotine amount of 8.861 mg.
Assuming that the given mean and standard deviation have NOT changed, find the probability of randomly seleting 45 cigarettes with a mean of 8.861 mg or less
P(M< 8.861 mg)=
Based on the result above, is it valid to claim that the amount of nicotine is lower?
O No. The probability of obtaining this data is high enough (not significantly low) to have been a chance occurrence.
O Yes. The probability of this data is unlikely (significantly low) to have occurred by chance alone.
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