Author Question: In a regression model such as y = 0 + 1X1 + 2X2 + , if changes in x1 and x2 happen simultaneously, ... (Read 44 times)

OSWALD · **on:** Jun 24, 2018

In a regression model such as y = 0 + 1X1 + 2X2 + , if changes in x1 and x2 happen simultaneously, the model is said to be affected by:

A) specification bias.
B) heteroscedasticity.
C) multicollinearity.
D) autocorrelation.

Question 2

When conducting two-sample tests for means with independent samples, ________.

A) it is always assumed that the population variances are equal
B) the test for equality of variances is conducted, and if the variances are not equal the t-test in Excel should not be used
C) the test for equality of variances is conducted to determine if the variances are equal and thereby choose the appropriate t-test in Excel
D) it is always assumed that the population variances are unequal

uniquea123 · **Reply #1 on:** Jun 24, 2018

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