Week 10 Quiz_ PSYC4700 - Oct 09 2023 to Dec 15 2023 - Section 04

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Capella University *

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PSYC4700

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Statistics

Date

Jan 9, 2024

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pdf

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Due Dec 15 at 11:59pm Points 20 Questions 15 Time Limit None Instructions Attempt History Attempt Time Score LATEST Attempt 1 9 minutes 16.1 out of 20 Score for this quiz: 16.1 out of 20 Submitted Dec 13 at 12:46pm This attempt took 9 minutes. Week 10 Quiz Quiz Instructions This quiz will gauge your mastery of the material presented this week. Before beginning, be sure to carefully review the concepts presented in this week's studies. Once you begin the quiz, you cannot start over, and you cannot retake it to change your grade. When you submit the quiz, it will be scored and your percentage of correctly answered responses will be tabulated. This quiz is worth 2 percent of your final grade. You must take the quiz and submit it in this week. There is no time limit on the quiz, but you must take it in a single sitting. Because the quiz can be taken only once, do not access the quiz until you are ready to complete it. When you have answered each question, submit your quiz to receive credit. It is automatically scored, and you will receive feedback immediately. 1.8 / 1.8 pts Question 1 A researcher measures the extent to which the speed at which people eat (in minutes) predicts calorie intake (in kilocalories). Which factor is the predictor variable in this example? a. the speed at which people eat Correct! Correct! b. calorie intake c. minutes and kilocalories d. all of the above

Correct. 1.3 / 1.3 pts Question 2 The method of least squares is used to determine the ______ straight line to a set of data points. a. best-fitting Correct! Correct! b. straightest c. most linear d. approximate Correct. 1.3 / 1.3 pts Question 3 The degrees of freedom associated with residual variation are equal to ______. a. the number of predictor variables b. the number of predictor variables minus one c. n - 1 d. n - 2 Correct! Correct! Correct.

1.3 / 1.3 pts Question 4 A statistical method that includes two or more predictor variables in the equation of a regression line to predict changes in a criterion variable is called ______. a. analysis of variance b. standard error of estimate c. residual regression d. multiple regression Correct! Correct! Correct. 1.3 / 1.3 pts Question 5 In a sample of 28 participants, suppose we conduct an analysis of regression with one predictor variable. If Fobt = 4.28, then what is the decision for this test at a .05 level of significance? a. X significantly predicts Y. Correct! Correct! b. X does not significantly predict Y. c. There is not enough information to answer this question. Correct. 1.3 / 1.3 pts Question 6 To standardize the beta coefficients, we first ______.

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a. analyze the significance of each data point b. analyze the residual variation c. convert the original data to standardized z scores Correct! Correct! d. compute the standard error of estimate Correct. 1.3 / 1.3 pts Question 7 To summarize any type of regression analysis using APA format, we report each of the following except the ______. a. test statistic b. degrees of freedom c. p value d. critical values Correct! Correct! Correct. 0 / 1.3 pts Question 8 Tests for ordinal data ______. a. are nonparametric tests You Answered You Answered

b. do not measure variance to test for significance c. minimize problems associated with having outliers in a data set d. all of the above Correct Answer Correct Answer Incorrect. 1.3 / 1.3 pts Question 9 Which of the following dispersions of scores for three groups (A, B, and C) best illustrate the null hypothesis for a Kruskal-Wallis H test? a. The number of scores above and below the median are equal. b. The mean differences between two groups are equal. c. The sum of ranks in each group does not differ between groups. Correct! Correct! d. The ranks in two groups are equal to 0. Correct. 1.3 / 1.3 pts Question 10 The test statistic (x) for the sign test is equal to ______. a. variability attributed to the groups divided by variability attributed to error b. the number of pluses or minuses, whichever occurs most often Correct! Correct!

c. the number of scores that are less than or equal to the median value d. the number of positive scores divided by the number of negative scores Correct. 1.3 / 1.3 pts Question 11 A researcher computes the Wilcoxon signed-ranks T test. She finds that the sum of positive ranks is 56 and the sum of negative ranks is 22. What is the value of the test statistic, T? a. 22 Correct! Correct! b. 34 c. 56 d. 78 Correct. 1.3 / 1.3 pts Question 12 The Mann-Whitney U test is used as a nonparametric alternative to which parametric test? a. one-sample t test b. two-independent-sample t test Correct! Correct! c. related-samples t test

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d. one-sample t test and related-samples t test Correct. 0 / 1.3 pts Question 13 What is the null hypothesis for a Kruskal-Wallis H test? a. The number of scores above and below the median are equal. b. The sum of ranks in each group does not differ between groups. Correct Answer Correct Answer c. The median differences between two groups are equal. You Answered You Answered d. The ranks in two groups are equal to 0. Incorrect. 0 / 1.3 pts Question 14 For the Friedman test, when χ_ R ^2 is less than the critical value, we decide to ______. a. retain the null hypothesis Correct Answer Correct Answer b. reject the null hypothesis You Answered You Answered c. not enough information Incorrect.

1.3 / 1.3 pts Question 15 The Friedman test compares differences in the sum of ranks in two or more ______ groups. a. independent b. related Correct! Correct! c. significant d. mature Correct. Quiz Score: 16.1 out of 20 WalkMe Chat