What assumption needs to be met in order for us to use the variance of the estimate from a sample?
A. Homoscedasticity
B. Homogeneity of variance
C. Bivariate normal distribution
D. None of the above.
What assumption needs to be met in order for us to use the variance of the...
22. The coefficient of determination explains the relationship between two variables the proportion of variance in one variable accounted for by another variable and vice versa the cause–effect relationship between two variables all of the above 23. The ____________ assumption is met if, in a scatterplot, the distance from the points to the line is relatively equal all along the line. a. homoscedasticity b. linearity c. curvilinearity d. heterolinearity 24. The strength of a relationship between two variables in correlation...
Name 4 assumptions that must be met, in order for us to use and calculate a z-test? 15 18
If the Durbin-Watson statistic has a value close to 0, which assumption is violated? a) Normality of the errors. b) Independence of errors. c) Homoscedasticity. d) None of the above.
8. Circle all the conditions below which must be met to use a 1-sample T interval. (4 points) a) b) c) The number of successes and the number of failures in the study is at least ten. The data values are randomly collected and independent. The data come from a distribution that is unimodal and fairly symmetric OR you have a large sample size. None of the above. d)
(21) A sample of size 20 is drawn from a normal distribution with unknown variance and mean. The sample variance s2 = 0.012. Find a 95% two-sided confidence interval for the standard deviation o of the population. A. [0.0833,0.1600] B. (0.010,0.0130] C. (0.0069,0.0256] D. None of the above
A significant F test means: a. Homogeneity of variance b. Unequal groups c. The researcher needs to reduce p-value d. Data transformation is not necessary
(ACC Payroll) What requirements needs to be met in order to be classified as a "highly compensated" employee? What do you think of this classification. Your original post should have more than 50 words but no more than 100 words. Your response to your two classmates should have more than 25 words but no more than 50 words.
30. Let us consider you have given your data to a computer to analyze, and it tells you the p-value = 0.0004. If your significance level (alpha) is 0.05, then you would a. fail to reject the null hypothesis b. reject the alternative hypothesis C. reject the null hypothesis d. consider the computer has given you an incorrect value 31. With small degrees of freedom, the t-distribution is not quite Normal, but with degrees of freedom the t-distribution will more...
When do we use t vs. z distributions? What are assumptions that must be met when using the t distribution? When can we assume equal population variances? What are degrees of freedom? When do we need to calculate them? What do we estimate when solving the formula for finding z obtained with sample proportions in the two sample case? How do we estimate it?
2. Suppose that you can draw independent samples (U,, U2,U. from uniform distribution on [0,1]. (a) Suggest a method to generate a standard normal random variable using (U, U2,Us...) Justify your answer. b) How can you generate a bivariate standard normal random variable? (Note that a bivariate standard normal distribution is a 2-dimensional normal with zero mean and identity covariance matrix.) (c) What can you suggest if you want to generate correlated normal random variables with covariance matrix Σ= of...