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What is the advantage of a randomized experiment in which the investigators randomly assign treatment conditions to subject over an observational study in which the subject self-select the treatment groups?
A student is taking a multiple choice exam in which each question has four choices . Assume that the student has knowledge of a correct answer to any of the questions.
Is the sample a part of the population or the population apart of the sample? Why would researchers just not use the entire population to be more accurate? Can you give an example of a sample from a given population?
In terms of the standard scores for both sections, the score of which section was better? What are the z-scores for both sections?
In healthy adults, x is approximately normally distributed with mean µ = 38 and standard deviation σ = 12. What is the probability that:
Regression equation to predict the dependent variable using multiple regression analysis:
Evaluate the value of population proportion. Develop a 99% confidence interval for population proportion.
Estimate the values using multiple regression models. An air conditioning as well as heating repair firm conducted a study to determine if the outside temperature, Illustrate the forecasted monthly electric bill.
If you were using the relative frequency of an event to estimate the probablility of the event, would it be better to use 100 trials or 400 trials according to the law of large numbers?
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years.
In a regression model involving 30 observations, the following estimated regression equation was obtained:
In the last municipal election, a sample of 350 registered voters showed that 85 voted for the incumbants. Find out a 98% confidence interval estimate for the proportion of all voters voting for the incumbants.
Use this information to find the upper and lower limits of the first class if you wish to construct a frequency distribution with 10 classes.
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