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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 0.830.71 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.
To be 99% sure that we will not be late in completing the project, what is the requested completion time in work-days?
a recent survey asked 4381 individuals whats most important to you when choosing where to live? the responses are shown
Spinning a coin, unlike tossing it, may not give heads and tails equal probabilities. I spun a penny 200 times and got 83 heads. How significant is this evidence against equal probabilities?
Determine the mean monthly sales, rounded to the nearest whole thousand - Determine the median monthly sales?
determine if this statistical study is descriptive or inferentiala study finds that the median household income in the
Test hypothesis that average price of gasoline in western states is higher than national average for Continental USA and the District of Columbia, i.e., higher than $3.74.
The mean wait time was 60 minutes and the standard deviation was 10 minutes. How many patients waited between 50 and 70 minutes?
q1.a psychologist dr. bill mikalek administered a test of manual dexterity to 30 third-graders. the times in minutes
a power company is considering damming a river that has a steady flow rate of 175 m3s. at the location where the dam
at a large university it is known that 50 of the students live on campus. the director of student life is going to take
Feasibility Study: Companies that sell groceries over the Internet are called e-grocers. Customers enter their orders, pay by credit card and receive delivery by truck. To determine whether an e-grocery would be profitable in one large city, a pot..
The following data represents the running time of films produced by 2 motion picture companies. Assume these are independent samples
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