We can make a causal claim from the results of the chi-square test ? tru or false

Pre (out of 100) Final (out of 200) Individual 63 130 1 Individual 80 137 2 Individual 56 139 3 Individual 17 116 4 Individual 54 153 Sample Мean 54 135 STD DEV 23.0759615 13.5092561

10) The following results are from a regression where the dependent variable is COST OF COLLEGE and the independent variables are TYPE OF SCHOOL which is a dummy variable = 0 for public schools and = 1 for private schools, FIRST QUARTILE SAT which is the average score of students in the top quartile of SAT’s, THIRD QUARTILE SAT which is the average score of students in the 3rd quartile, and ROOM AND BOARD which is the cost of room and board at the school. The first set of results includes all the independent variables whereas the second set of results excludes the THIRD QUARTILE SAT variable. a) Based on these two sets of data, does there appear that multicollinearity is a problem (specifically, does it appear that THIRD QUARTILE SAT is highly collinear with the other independent variables? Explain. b) Calculate the VIF for THIRD QUARTILE SAT. c) Based on the VIF, do you think that multicollinearity is a problem? Explain.

When should the Empirical Rule be used?

1) If the data is IQ test scores, an individual with a negative z-score what IQ level would he have? 2

15) Fine the sum of products (SP) and sum of squares (SS) for the variables of interest mentioned in the study above. Then find the correlation between the two variables of interest. (Round all answers to 2 decimal points) a) SP = b) SSbullying =  c) SSprejudice =  d) r =

- test the null hypothesis that the population mean, u is 14.

Researchers were interested in assessing whether stress levels at the beginning of the semester are related to (i.e., correlated with) stress levels during finals week. To test this, stress was measured in 5 students at the start of the semester and then again at the end of the semester during finals week.     Participant Stress 1 Stress 2 (X - MX) (Y - MY)  (X - MX) (Y - MY) (X - MX)2 (Y - MY)2  1 22 22 -4.4 -6       2 32 34 5.6 6       3 24 25 -2.4 -3       4 28 30 1.6 2       5 26 29 -0.4 1         What is the observed correlation coefficient (i.e., r value)?

(1 point) According to a recent marketing campaign, 100 drinkers of either Diet Coke or Diet Pepsi participated in a blind taste test to see which of the drinks was their favorite. In one Pepsi television commercial, an anouncer states that "in recent blind taste tests, more than one half of the surveyed preferred Diet Pepsi over Diet Coke." Suppose that out of those 100, 42 preferred Diet Pepsi. Test the hypothesis, using a = 0.05 that more than half of all participants will select Diet Pepsi in a blind taste test by giving the following: (a) the test statistic (b) the critical z score

jake suspects that individuals with an optimistic world view live longer than individuals with a pessimistic view. Sate the research hypothesis the null hypothesis cases independent variable dependent variable