Data Analysis Quiz: Master Key Concepts in Research Methods

Quiz: Data Analysis Due Dec 10 at 11:59pm Points 40 Questions 20 Time Limit 90 Minutes Allowed Attempts Unlimited Instructions Attempt History Attempt Time Score LATEST Attempt 1 32 minutes 32 out of 40  Correct answers are hidden. Score for this attempt: 32 out of 40 Submitted Dec 6 at 9:50pm This attempt took 32 minutes. The quiz: Covers the Textbook material from Module 7: Week 7 . Contains 20 multiple-choice questions. Is limited to 90 minutes . Allows unlimited attempts and the highest attempt will count towards the grade. Is worth 40 points . You may refer to your notes and textbooks at any time during the assessment. Submit this assignment by 11:59 p.m. (ET) on Sunday of Module 7: Week 7. TAKE THE QUIZ AGAIN 0 / 2 pts Question 1 Incorrect Incorrect When the points in a scatter plot clearly move in a top-left to bottom-right direction, one has a ______ relationship.

positive negative causative none of these 0 / 2 pts Question 2 Incorrect Incorrect The mode is ______. the arithmetic average the middle score the most frequent score a measure of variability 2 / 2 pts Question 3 What is an advantage of the mean as a measure of central tendency? It is not in±uenced by extreme scores. It is representative even when there is extreme skewness. It is the most precise measure of central tendency. It can be used with nominal variables.

2 / 2 pts Question 4 The purpose of descriptive statistics is to ______. make inferences about a population from a sample test hypotheses make interval estimates summarize and explain a set of data 2 / 2 pts Question 5 Harold needs to calculate a median. The scores he has are: 10, 1, 9, 3, 4, 8, 6, 5, 2, and 7. The median is ______. 4.5 5 5.5 6 2 / 2 pts Question 6 What is the median of the following set of scores: 18, 6, 12, 10, 14?

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10 14 18 12 2 / 2 pts Question 7 A measure of variability is a numerical index ______. of the central tendency of the data values in a set of data that indicates how spread out the data values are in a set of data that indicates the level of skewness of the data that indicates if two variables vary together 0 / 2 pts Question 8 Incorrect Incorrect Which will be the best measure of central tendency for these data?

the mode the median the mean the variance 2 / 2 pts Question 9 Helen is doing a study where she is looking at the percentage of students pro²cient in mathematics over a 10-year period in a school district. What would be the best way to display the trend in percentages? a scatterplot a bar graph a line graph calculate the mean and standard deviation 2 / 2 pts Question 10 The range refers to ______. the difference between the lowest and highest score the difference between the mean and the median the mode in a bimodal distribution

the difference between a score and the mean 2 / 2 pts Question 11 An index (e.g., a mean or a correlation) calculated with sample data is called a ______, whereas an index calculated with the complete set of population data (i.e., everyone in the population) is called a ______. statistic; parameter parameter; statistic sample; population population; sample 2 / 2 pts Question 12 The likelihood of rejecting the null hypothesis when it is false is known as ______. power strength direction force

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2 / 2 pts Question 13 Which of the following is NOT an effect size indicator? probability value η 2 ω 2 correlation coe³cient squared 2 / 2 pts Question 14 What is the difference between a sample statistic and the corresponding population parameter called? sampling error sampling deviation standard error con²dence error 2 / 2 pts Question 15 Which of the following is the alternative hypothesis for the signi²cance test for a correlation coe³cient? H : ρ = 0 1 XY

H : µ ≠ µ 1 M F H : β ≠ 0 1 YX 1. X 2 H : ρ ≠ 0 1 XY 2 / 2 pts Question 16 If one has two categorical variables and constructs a contingency table, what statistical test would be appropriate to tell whether the variables were related or not? t test normality test ω test 2 χ test 2 2 / 2 pts Question 17 If we drew all possible samples from a population, calculated the correlation coe³cient for each of the samples, and constructed a line graph (showing the shape of the distribution) based on all of those sample correlation coe³cients, what would we have? the population distribution a sample distribution a sampling distribution

a parameter distribution 2 / 2 pts Question 18 Dr. White is planning a study of the effectiveness of different memory strategies. When should he set the alpha level to be used in his study? before she analyzes the data after she has analyzed the data after looking at the probability values from the analyses The computer will set the alpha level when it analyzes the data. 0 / 2 pts Question 19 Incorrect Incorrect Which of the following is the null hypothesis for testing the difference between two means for statistical signi²cance? H : µ = 476 0 GRE-V H : µ = µ 0 M F H : β = 0 0 YX 1 X 2 h : ρ = 0 0 XY

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2 / 2 pts Question 20 If you drew all possible samples from some population, calculated the mean for each of the samples, and constructed a line graph (showing the shape of the distribution) based on all of those means, what would you have? a population distribution a sample distribution a sampling distribution a parameter distribution Quiz Score: 32 out of 40

Quiz_ Data Analysis_ EDUC815_ Quantitative Methods of Research (D04)

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