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To demonstrate causation, investigators have used (i) natural experiments, (ii) randomized controlled experiments, and (iii) regression models, among other methods. What are the strengths and weaknesses of methods (i), (ii), and (iii)? Discuss, preferably giving examples to illustrate your points.
The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43. The standard deviation is $0.09. The average price of a sample of 16 low-calorie frozen desserts is $1.03.
the teacher ratio is 125. currently the school district has 3150 students. if the student enrollment increases by 20
Bowling balls the sample standard deviation was found to be 0.52 pounds. Construct a 95% confidence interval for the variance of the bowling ball weight.
Consider the following partially completed computer printout for a regression analysis where the dependent variable is the price of a personal computer and the independent variable is the size of the hard drive.
In a sample of 1,000 representing a survey from the entire population, 650 people were from Laketown, and the rest of the people were from River City.
in a past election the voter turnout was 51. in a survey 843 subjects were asked if they voted in the election. find
Document the 2NF and the 3NF stages by explaining how each table, and each field in that table complies with the appropriate normalization rule. Use your own words, incorporating normalization and functional dependency terminology.
What is the probability of Two ones in 2 rolls of a die and Three tails in 3 ?ips of a coin?
question a research team compared two methods of measuring tread wear on tires. eleven tires were each measured for
"You are running a chi-squared test. If you have 5 groups with 3 characteristics each, what would your critical value be with an alpha of .25? a . Between 0 and 3.0
To get a sense of the data, provide two well labeled scatter-plots of 1) revenue vs. budget, and 2) revenue vs. screens. Also, provide a correlation matrix of these three variables
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
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