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A researcher is studying the effect of three different row spacing on the yields of four different varieties of cotton. He randomly assigns each row spacing-variety combination to six 50' x 50' plots. Within each plot he randomly selects 12 plants and weighs the cotton yield of the individual plants
a) Is this an observational study or an experimental study
b) what type of experimental design is this
c) what is or are the treatment factor or factors
d) what are the experimental units
e) what are the measurement units
Some television stations attempt to gauge public opinions by posing a question on the air and asking viewers to call to give their opinions.
Find a 90% confidence interval for the mean amount left by all groups.
question the main trial in problem 2 is conducted and involves a total of 200 patients. patients are
Mean waiting time was 15 minutes and that the standard deviation was 4 minutes. The 95% confidence interval for the population mean of waiting times is?
A doctor prescribed the drug penicillin to three different patients as a form oLtreatment for an infectious disease. It is known from the general population that 20 out of every 100 individuals are allergic to the drug.
1.In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 1-10. The data appear below:
I want to see two methods are the significantly same or not. Each methods has 5 variables are inside. so I would like to see each 5 variables from methods A and B are significantly the same and overall the two methods are significantly same or not..
suppose a random sample of 90 measurements is selected from a population with a mean of 35 and a variance of 300.
The two cars drove a combined total of 1450 miles, and the sum of their fuel efficiencies was 40 miles per gallon. What were the fuel efficiencies of each of the cars that week?
in bernoulli trials p let vn be the number of trials required to produce either n successes or n failures whichever
How many cities have a population of at least 100,000 but less than 1,000,000? What percentage of cities are in this group?
Run a Monte Carlo simulation 1000 trials for the following distribution. Determine the mean and standard deviation of the simulated distribution.
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