4 Numeric 1 point A PRE of \_\_\_ indicates that the two variables are not associated. 0 5 Multiple Choice 1 point The number of degrees of freedom for a chi-square test is calculated as (rows-1)(columns-1) n-1 (rows-1)(columns+1) n+1 6 Multiple Choice 1 point Which of the following values could NOT be a chi-square statistic? 45 -57.4 57.45 .45 Multiple Choice 1 point Which of the following affects the shape of a chi-square distribution? The number of variables being analyzed The t statistic The level of measurement of the variable The degrees of freedom
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Question 3 (10 points) Which degrees of freedom formula is used in a Chi-Square test for Independence? df = n-1 df = 2n-1 df = n-2 df = (r-1) x (c-1) Question 4 (10 points) When performing a Multiple Linear Regression Analysis, the R2 provides a measure of: the largest value of the dependent variable
Madhur L.
Question 1 (3 points) I have a 10-sided die. I roll it 50 times and count up the number of rolls for each side. I'm interested in whether or not this die was evenly weighted. The chi-square goodness of fit test would be appropriate to investigate this question. True False Question 2 (3 points) We have a p-value of 0.02 in a chi-square goodness of fit test. Which of the following can we conclude? The test is significant and we accept the alternative The test is significant and we reject the alternative The test is significant and we reject the null The test is not significant and we reject the alternative Question 3 (3 points) Which of the following are true? None of these All chi-square values are between -10 and +10 All chi-square tests are one-tailed All chi-square values are positive Question 4 (3 points) We're interested in whether or not there is an association between number cats owned and number of dogs owned. Which test would you run? Linear regression Chi-square goodness of fit One-way ANOVA Chi-square test of independence Question 5 (3 points) Degrees of freedom for a chi-square test of independence is equal to which of the following? n - 1 (#rows - 1) * (#columns - 1) (#columns * #rows) - 1 n1 + n2 - 2 Question 6 (3 points) In a t-distribution, observations are _____ likely to fall 2 standard deviations beyond the mean none of these less more equally Question 7 (3 points) Which of the following is true of t-distributions? It has thinner tails than the normal distribution Unlike the normal distribution, it is not symmetrical It has thicker tails than the normal distribution None of these
The table value for chi-square at the .05 level of significance is 3.84 with one degree of freedom and 5.99 with two degrees of freedom. Our calculated chi-square value in a table with 2 rows and 3 columns is 4.50. Our chosen level of significance is .05. What does this mean? a. Our results are statistically significant. b. Our results are NOT statistically significant. c. We had one degree of freedom. d. a and c, only, are true. Question 19 What types of statistics are not governed by the parameters of the population (e.g. assumption of normal distribution)? Parametric Non-parametric Population Distribution
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