The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.905 g and a standard deviation of 0.296 g. The company that produces these cigarettes claims that it has now reduced the amount of nicotine. The supporting evidence consists of a sample of 49 cigarettes with a mean nicotine amount of 0.829 g.
Assuming that the given mean and standard deviation have NOT changed, find the probability of randomly seleting 49 cigarettes with a mean of 0.829 g or less.
P(M < 0.829 g) =
Enter your answer as a number accurate to 4 decimal places. NOTE: Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.
Based on the result above, is it valid to claim that the amoutn of nicotine is lower?
Assuming that the given mean and standard deviation have NOT changed, find the probability of randomly seleting 49 cigarettes with a mean of 0.829 g or less.
P(M < 0.829 g) =
Enter your answer as a number accurate to 4 decimal places. NOTE: Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.
Based on the result above, is it valid to claim that the amoutn of nicotine is lower?