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The regulatory board of health in a particular state speci?es that the ?uoride levels in water must not exceed 1.5 parts per million (ppm). The 20 measurements given here represent the randomly selected daily early morning readings on ?uoride levels in water at a certain city.
0.88 0.82 0.97 0.95 0.84 0.90 0.87 0.78 0.75 0.83
0.71 0.92 1.11 0.81 0.97 0.85 0.97 0.91 0.78 0.87
Test the hypothesis that the median ?uoride level for this city is 0.90 against the alternative that the median is different from 0.9 at α = 0.01, using (a) the large sample sign test, and (b) the Wilcoxon signed rank test. Interpret the results.
the computer-science aptitude score x and the achievement score y measured by a comprehensive final were measured for
For a normal random variable X with mean 70 and standard deviation 10. Calculate the probability that 60 80}.
Psychological test. For the sample data, n = 50,mean = 17.3 and S.D = 5.4.USE level of significance = .05. Complete hypotheses testing using P value approach.
Assuming that = 119.5 ng.ml, test the claim that the mean cotinine level of all smokers is equal to 200.0 ng/ml. Use a 0.05 significance level.
Suppose a government forecast indicates that there is a 70% chance of economic expansion or status quo in the next 4 years and there is a 30% chance that the economy will show a decline. What is the optimal decision in this problem? Did you make a..
Determine the completion time and standard deviation (σ) for project roundoff the standard deviation to the nearest hundredth: two decimal places.
suppose that the average life of a refrigerator before replacement is m 14 years with a 99.7 of data range from 8 to
Q. An owner of a chain of stores would like to predict weekly sales based on the number of customers who made a purchase. A random sample of 10 stores were selected. The weekly sales are in thousands of dollars.
in 1999 a sample of 200 in-store shoppers showed that 42 paid by debit card. in 2004 a sample of the same size showed
a if a hotel has 26 king size beds 22 queen sized beds 28 double beds and 37 twin beds what is the probability that you
1. what is the probaility that the weather in sydney will be bewteen 75 and 85 degree?2. you are aware that for iq mean
Alexa got 144 on her test which has a mean of 128 and a standard deviation of 34. What is her z-score?How do you calculate the z score for the raw score of 10 based on the following distribution: 8, 9, 15, 30, 7, 8 ?
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