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Midterm 1 - Version A - Multiple Choice

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Unformatted text preview: Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10    PSYCHOLOGY 60  SPRING, 2010            MIDTERM 1  Tuesday, April 20th, 2010              FULL NAME ___________________________________________________________________________________            STUDENT ID __________________________________________________________________________________    Please put your name and ID number on this page AND on the Scantron form.                    VERSION A    1  Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10                                             This page is intentionally blank.    2  Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10  3      1) 2) 3) 4) 5) For a distribution of scores, which of the following z‐score values represents the most extreme  location on the left‐hand side of the distribution?  a. z = +1.00  b. z = +2.00  c. z = ‐1.00  d. z = ‐2.00*  e. cannot determine from the information given    The relationship between a statistic and a sample is the same as the relationship between:  a. a sample and a parameter  b. a sample and a population  c. a statistic and a parameter  d. a parameter and a population*  e. descriptive statistics and inferential statistics    If it is not possible to divide the existing categories of a variable, then it is an example of a  _________ variable.  a. construct  b. independent  c. dependent  d. continuous  e. discrete*    One item on a questionnaire asks, “How many siblings (brothers and sisters) do you have?”  A  researcher computes the mean, the median, and the mode for a set of n = 50 responses to this  question.  Which of the following statements accurately describes the measures of central  tendency?  a. because the scores are all whole numbers, the mean will be a whole number  b. because the scores are all whole numbers, the median will be a whole number  c. because the scores are all whole numbers, the mode will be a whole number*  d. because the scores are all whole numbers, the mean and median will have the same value  e. all of the above are correct descriptions  What is the rationale behind using n‐1 in calculating the sample standard deviation instead of  just N?  a. None, you can use either equation interchangeably   b. n‐1 removes any potential outliers in the sample which could exaggerate the variance  c. n‐1 will yield a larger result, which is a better reflection of the standard deviation of the  population*  d. n‐1 yields a smaller result, which is a better reflection of the standard deviation of the  population  e. Both b and d          Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10  4    6) The value of one score in a distribution is changed from X = 20 to X = 30.  Which measure(s) of  central tendency is (are) certain to be changed?  a. the mean*  b. the median  c. the mean and the median  d. the mode  e. cannot determine from the information given  7) Which of the following students scored highest on his/her quiz relative to the other students  in his/her class?  (Each of the five students took quizzes in different classes.)  a. Allen:  Score = 65.  Quiz mean = 80.  Z‐score = ‐5.   b. Barbara:  Score = 42.  Quiz mean = 36.  Z‐score = +2.  c. Chris:  Score = 98.  Quiz mean = 81.  Z‐score = +1.  d. Davina:  Score = 64.  Quiz mean  = 65.  Z‐score = ‐1.  e. Enrique:  Score = 56.  Quiz mean  = 40.  Z‐score = +4.*    A student wants to know the proportion of students who scored above him on the Psych 60  final exam.  Assume the scores on this exam are normally distributed. Which of the following  information does this student NOT need:  a. the number of students in the class**  b. the mean of the class  c. the standard deviation of the class  d. the student’s own score  e. All the above information is necessary    Max is trying to estimate the number of hours the average UCSD student has spent at  Disneyland.  He collects data from a small sample of eight students, which by random chance  happens to include one student whose parents both worked at Disneyland his whole life.  His  data is as follows (in hours):  4, 19, 0, 52, 19, 36, 2, 11231.  Based on these data, which of the  following measures of central tendency would not be a good estimate of central tendency?  a. Mean*  b. Median  c. Mode  d. A measure of central tendency from a much larger sample.  e. The mean, median, and mode of all UCSD students  8) 9) 10) Twenty‐five patients are taking a test to determine if they have a particular cognitive disorder.  One definition for having this disorder is scoring below 90% of the population on a particular  cognitive task. The population mean score for this task is 50, with a standard deviation of 5. In  the sample of 25, the mean score on the task is 45 with a standard deviation of 4. In the  population, performance on this task is normally distributed. The doctor is trying to  determine at what score he should diagnose patients with this disorder. Help him by  determining approximately what score should be used for the diagnosis.  a. 43.5 *  b. 38.5  c. 45  d. 40   e. cannot determine from the information given  Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10  5      11) A population of scores has μ = 44. In this population, a score of X = 40 corresponds to z = ‐1.00.  What is the population standard deviation?  a. 2  b. 4*  c. ‐2  d. ‐4  e. cannot determine from the information given    12) On an exam with a mean of μ = 70, you have a score of X = 75. Which of the following values  for the standard deviation would give you the highest position within the class?  a. σ = 1*  b. σ = 5  c. σ = 10  d. σ = 70  e. cannot determine from the information given    13) If every score in a population with μ = 60 and σ = 8 is transformed into z‐scores, then the  resulting distribution of z‐scores will have a mean of ____ and a standard deviation of ____.  a. 0 and 1*  b. 60 and 1  c. 0 and 8  d. 60 and 8 (unchanged)  e. cannot determine from the information given    14) Under what circumstances would a score that is 15 points above the mean be considered an  extreme score?  a. when the population mean is much larger than 15  b. when the population standard deviation is much larger than 15  c. when the population mean is much smaller than 15  d. when the population consists of many more than 15 scores  e. when the population standard deviation is much smaller than 15*    15) You are investigating how good UCSD students are at spelling by looking at a sample of 10  students. Your measure is how many words are correctly spelled before the student makes a  mistake.    Some students misspell the very first word, while the majority spell between 5 and  10 words correctly before making a mistake.  One student, however, who was a former  National Spelling Bee contestant, spells 89 words correctly without making a mistake.  Which  of the following is true of this data set?  a. It is negatively skewed and the mean is greater than the median.  b. It is positively skewed and the mean is greater than the median. *  c. It is negatively skewed and the mean is lower than the median.  d. It is negatively skewed and the mean is lower than the median.  e. Based on this information, it is impossible to tell the skew and whether the mean or the  median is higher.    Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10    16) John drives to work each morning and the trip takes an average of µ = 38 minutes.  The  distribution of driving times is approximately normal with a standard deviation of σ = 5  minutes.  For a randomly selected morning, what is the probability that John’s drive to work  will take between 36 and 40 minutes?  a. 0.3446  b. 0.3892  c. 0.1554  d. 0.6554  e. 0.3108*    17) Which set of scores has the smallest standard deviation?   a. 11, 17, 31, 53, 64, 18, 23, 19  b. 5, 11, 42, 22  c. 145, 143, 145, 147*  d. 27, 105  e. Depends on whether the scores represent a sample or a population    18) A jar contains 10 red marbles and 20 blue marbles. If you randomly select one marble from  the jar, what is the probability of getting a red marble?  a. 10/20  b. 20/30  c. 1/10  d. 1/30  e. 10/30*  19) Unlike the mean, the median:  a. is a statistic only used when the data are interval/ratio scale  b. is a statistic only used when the data are ordinal  c. is highly insensitive to outliers*  d. is highly sensitive to outliers  e. Both b and c  20) A recent study reports that increased lighting during the winter months results in lower  depression scores. For this study, what is the dependent variable?  a. the amount of light  b. the season of the year  c. the level of depression*  d. the individuals who participated in the study  e. there is no dependent measure in this type of study    21) What is the value of SS for the following sample?           Scores: 1, 3, 5  a. SS = 8*  b. SS = 8/2  c. SS = 8/3  d. SS = (8)2  e. SS = (8/2)2  6  Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10  7    22) What is the shape of the distribution for the following set of data?                   1, 1, 2, 2, 2, 2, 3, 3, 7, 8  a. symmetric  b. positively skewed*  c. negatively skewed  d. cumulative  e. cannot determine from the information given    23) In experimental methods, what is the proper name of the variables that are manipulated?  a. independent variables*  b. extraneous variables  c. dependent variables  d. control variables  e. manipulated variables    24) A researcher investigating how stubbing one’s toe causes anger chooses to measure the anger  his subjects express as the number of times they swear after stubbing their toes. This  researcher’s choice to measure “anger” this way is his:  a. construct definition  b. measurement definition  c. discrete definition  d. operational definition*  e. scale definition    25) For the following distribution, how many people had a score between 40 and 50?  a. 10                X          f  b. 14                60‐74      2    c. 12                45‐59      14    d. 7                30‐44      10    e. cannot determine from the information given*    15‐29      7    26) What additional information is obtained by measuring on an interval scale compared to an  ordinal scale?  a. whether the measurements are the same or different  b. the direction of the differences  c. the size of the differences*  d. Whether the scale has a true zero point  e. None of the above    27) What value will you obtain if you add all the deviation scores for a dataset, and then divide  that sum by the number of scores in the dataset?  a. the sample variance  b. the population variance  c. you will always get one  d. you will always get zero*  e. depends on whether the data are being used as a population of a sample    Psychology 60 – Spring, 2010 – Midterm1 – Given 4/20/10  8    28) The average verbal SAT score for the entire class of entering freshmen is 530. However, if you  select a sample of 20 freshmen and compute their average verbal SAT score, you probably will  not get exactly 530. What statistical concept is used to explain the natural difference that  exists between a sample mean and the corresponding population mean?  a. statistical error  b. inferential error  c. sampling error*  d. parametric error  e. variable error              Make sure you bubbled in correctly which Test Form you were taking.   We cannot score your exam without this! Before continuing, check that you have done this.    ...
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