Psych 311 wsu Exam Questions and Answers Best rated A+ Guaranteed Success Latest Update

Psych 311 wsu Exam Questions and Answers Best rated A+ Guaranteed Success Latest Update The size of a population means is symbolized as ___, whereas the size of a sample mean is symbolized as ___. - Answer- A. ,U; M What is the description of SS (sum of squares) in words? That is, what does it stand for? - Answer- B. Sum of squared deviations of scores from the mean A researcher records the sound during a series of lessons taught by a substitute teacher at a local elementary school. In his study, he found that the sound was 80+-6 decibels. Assuming the data are normally distributed, which of the following is an appropriate conclusion? - Answer- C. 95% of classes were between 68 and 92 decibels The sample variance is... - Answer- D. All of the above -a. an unbiased estimator of the population variance -b. associated with n-1 degrees of freedom -c. computed by dividing SS by df The use of tables and graphs to summarize data is an example of... - Answer- C. Descriptive statistics You are interested in measuring the construct, reinforcement. Which of he following measures for this construct is quantitative and continuous? - Answer- C. The size of a reward in grams In the stem-and-leaf display, each number to the right of the vertical line is referred to as a ___; the number to the left of the vertical line are called the ___. - Answer- B. Leaf; stem A researcher measures the amount of coffee consumed by college students during the final exam week. In her study, she found that students drink 2.3 +_0.8 cups of coffee per study session. Assuming the data are normally distributed, which of the following is the most appropriate conclusion? - Answer- B. Most students drink between 1.5 and 3.1 cups of coffee per study session Researchers measure data in a ___ to learn more about individuals in the larger ___ of interest. - Answer- A. Sample; population Each deviation in the number of variance is squared because... - Answer- A. Without squaring each deviation, the solution for SS would be zero Fill in the missing values for A and B in this frequency distribution table: intervals Frequency 6.0-6.6 12 5.3-5.9 7 4.6-5.2 B 3.9-4.5 10 A-3.8 8 (total 30) - Answer- A. A=3.2, B=13 The degrees of freedom for the sample variance... - Answer- B. Are equal to the sample size minus one A professor grades 120 research papers and reports that the average score was an 80%. What do we know about the sum of the differences of these 120 scores from their mean of 80%? - Answer- C. The sum of the differences is equal to zero Measures of variability can range in value from... - Answer- B. 0 to positive infinity A cumulative percentage summary that indicated the percentage of scores at or below a given value is called a... - Answer- C. Percentage ranking A researcher records 17 scores. What is the median position of these scores? - Answer- C. The average of the 8th and 9th scores in numeric order When would a researcher calculate a population mean? - Answer- C. When data are measured for all members of a population A researcher measures the number of trials it takes two samples of participants to master a new task. In both samples, SS= 240. Sample A consisted of 12 participants and Sample B consisted of 18 participants. Which sample is associated with the largest variance? - Answer- A. Sample A Which of the following best describes an independent variable? - Answer- C. The manipulated variable A researcher records the following data: 4, 4, 4, 4 and 3. How would you describe the variability of these data? - Answer- C. It is very small (close to 0) bc scores are approximately the same The following is a simple frequency distribution table. If we convert this frequency distribution to relative percentages, which of the following gives the corresponding percentages in each interval listed from the top down. Intervals Frequency 44-46 6 41-43 4 38-40 5 35-37 10 32-34 5 (total 30) - Answer- C. 20%, 13%, 17%, 33%, 17% work: 6/30=0.20= 20% 4/30=0.13= 13% 5/30=0.166= 17% 10/30=0.33= 33% 5/30= 17% Each of the following is an example of quantitative date, except.... - Answer- C. Political affiliation A researcher finds that 12% of participants make between 3-5 visits to a physician each year. What are the real limits for this interval? - Answer- B. 2.5-5.5 A therapist observes that spouses are likely to forgive their partners for lying to them if they find out the truth from their spouse and not a third party. In this example, the dependent variable is... - Answer- D. Forgiveness Which of the following best describes a dependent variable? - Answer- B. The measured behavior A researcher determines that the probability of missing class among students at a local school is p= .16. Assuming that the school has 300 students, enrolled, how many students can we expect to miss class on a given day? - Answer- B. 48 students (300 * .16 --> n*p) If the standard deviation of a probability distribution is 9, then the variance is... - Answer- C. 81 When the probability of one outcome changes depending on the occurrence of a second outcome, these outcomes are referred to as.... - Answer- D. Conditional The probability of a college student being employed is p= .35. The probability of a student being employed and dropping out of college is p= .20. Hence, the probability of a student dropping out of college, given that he or she is employed, is... - Answer- B. p= .57 (.2/.35) The following distribution most closely approximates a .... - Answer- A. Normal distribution The normal distribution has all of the following characteristics, except... - Answer- C. the total area under the curve is greater than 1.0 What is the implication for the tails of a normal distribution being asymptotic? - Answer- B. That extreme scores are possible in a normal distribution Bayes' theorem is often applied to a variety of ___ probability situations including those related to statistical inference. - Answer- C. Conditional