PSYC 3002 Week 1 Statistics Test – Question and Answers

PSYC 3002 Week 1 Statistics Test – Question and Answers Week 1 Test • Sarah learns that her 3-year-old scored as well as or better than half of children in Pam’s language development study. Sarah’s child scored at the _________ percentile. Selected Answer: b. 50th Correct Answer: b. 50th • Question 2 Pam is studying speech development in 3-year-olds in daycare. She observes 30 children over two weeks, and takes note of various aspects of the children’s speech. What is the population in this study? Correct Answer: b. Three-year-olds in daycare. • Question 3 2.5 out of 2.5 points Pam wants to know if a new vocabulary intervention increases language development. She administers the intervention to 30 three-year-olds in daycare. She then compares the number of vocabulary words children who received the intervention can say to the number of vocabulary words children who did not receive the intervention can say. What is the independent variable in this study? Selected Answer: d. The vocabulary intervention Correct Answer: d. The vocabulary intervention • Question 4 2.5 out of 2.5 points Continuous variables can contain fractions. Selected Answer: True Correct Answer: True • Question 5 2.5 out of 2.5 points A sample is Selected Answer: b. a subset of a group to which a law is applied Correct Answer: b. a subset of a group to which a law is applied • Question 6 2.5 out of 2.5 points People can be variables in a study. Selected Answer: False Correct Answer: False • Question 7 2.5 out of 2.5 points A population is Selected Answer: a. the entire group to which a law of nature applies Correct Answer: a. the entire group to which a law of nature applies • Question 8 2.5 out of 2.5 points Which of the following statements about bar graphs is false? Selected Answer: a. Adjacent bars touch. Correct Answer: a. Adjacent bars touch. • Question 9 2.5 out of 2.5 points If a score’s relative frequency is 0.27, what is its percent? Selected Answer: c. 27% Correct Answer: c. 27% • Question 10 2.5 out of 2.5 points Which of the following orders lists the scales of measurement from the scale providing the least specific information to the scale providing the most specific information? Selected Answer: d. nominal, ordinal, interval, ratio Correct Answer: d. nominal, ordinal, interval, ratio • Question 11 Distance in inches is considered a(n) ___________ variable. Correct Answer: d. ratio • Question 12 2.5 out of 2.5 points Temperature in Celsius is measured on a(n) ________________ scale of measurement Selected Answer: c. interval Correct Answer: c. interval • Question 13 2.5 out of 2.5 points Correlational studies primarily are done to Selected Answer: a. determine whether there is a relationship between two variables Correct Answer: a. determine whether there is a relationship between two variables • Question 14 2.5 out of 2.5 points In a/an ____________, the experimenter measures scores on two variables. In a/an _____________, the experimenter manipulates or changes one variable and measures scores on the other. Selected Answer: c. correlational study; experiment Correct Answer: c. correlational study; experiment • Question 15 2.5 out of 2.5 points Suppose you've noted that your score is to the left of your friend's when placed on a normal distribution. This means that your score is ________________ than her score. Selected Answer: b. lower Correct Answer: b. lower • Question 16 Pam wants to know if a new vocabulary intervention increases language development. She administers the intervention to 30 three-year-olds in daycare. She then compares the number of vocabulary words children who received the intervention can say to the number of vocabulary words children who did not receive the intervention can say. What is the dependent variable in this study? Correct Answer: a. The number of vocabulary words the children can say • Question 17 Pam is studying language development in 3-year-olds in daycare. She observes 30 children over two weeks, and takes note of various aspects of the children’s language. What type of statistics should Pam use to summarize the language development of the 30 children? Correct Answer: a. Descriptive statistics • Question 18 2.5 out of 2.5 points A statistics class has 60% females and 40% males. A researcher selects a sample having 80% males and 20% females. Why should the researcher be cautious of making inferences about the entire class based on the sample? Selected Answer: b. Because the sample appears to be unrepresentative of the population. Correct Answer: b. Because the sample appears to be unrepresentative of the population. • Question 19 Temperature in degrees Fahrenheit is a clear example of a/an _____________________________ variable. Correct Answer: b. quantitative • Question 20 2.5 out of 2.5 points If I want to summarize the characteristics of my statistics class to my friend, I should use Selected Answer: d. descriptive statistics Correct Answer: d. descriptive statistics