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a) What is the difference between an independent and a dependent variable? What is a bivariate or simple regression model? Does a regression model imply causation? Why or why not?
b) Explain the logic of the ordinary least Square (OLS) method? How are the least squares formulas for the slope and intercept derived?
Probability distribution described by the following density curve and The expected value of the sum of the weights of the two oranges, in pounds
In the history class the mean score was 76 with standard deviation 3.
Explain what property associated with the Central Limit Theorem you consider the most important contribution, enabling the use of the normal distribution for sample means.
The standard deviation of is usually called the A. randomized standard error B. standard error of the sample C. standard error of the population D. standard error of the mean
Use the least-squares method to compute the regression of coefficients b0 and b1.
An issue that faces individuals investing for retirement is allocating assets among different investment choices. A study conducted 10 years ago showed that 65% of investors preferred stocks to real estate as an investment.
First, write down three social problems (e.g., drug abuse, gang membership, bullying, domestic violence, child abuse, etc) that we might attempt to predict using logistical regression.
Calculate the mean, median, range, and standard deviation for the Body Fat Versus Weight data set. Report your findings, and interpret the meanings of each measurement.
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
Determine the probability that exactly 8 of them started smoking before 18 years of age.
If employee is chosen at random, determine the probability that employee is female and salaried staff? Choose the best answer from the following.
In Excel, which of the following functions is used to conduct a hypothesis test (using the p -value) for a population variance
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