Pre-Quiz Flashcards
Which of the following statistical analysis procedures is used to measure the accuracy of diagnostic procedures a.) analysis of variance b.) multiple regression analysis c.) sensitivity and specificity analysis d.) none of the above
- C
Approximately what percentage of the cases in a normal distribution fall between the z-scores 1.96 and – 1.96? a. 30% b. 99% c. 47% d. 95% e. 25%
- D
For a given distribution of scores, you are told that Σ(X - μ) = 2. Which of the following is most likely true? a. a few scores are very far above the mean b. this must be a negatively skewed distribution c. this must be a positively skewed distribution d. an arithmetic error was made
- D
Which of the questions can be successfully answered by implementing a statistical technique? A. What results if one repeatedly puts blue litmus paper into acid solutions? B. What results if one repeatedly flips a fair coin? C. What is the acceleration rate of an object that is at constant velocity? D. All of the above questions can be effectively answered using a statistical technique.
- B
A researcher discovers that age and income are related in a systematic way. To describe this relationship, we would probably use a: A. clinical technique B. predictive technique C. correlational technique D. collateral technique
- C
Our goal in testing the null hypothesis is to a) fail to reject the null and the alternative b) reject the null and accept the alternative hypothesis c) reject the alternate and accept the null d) fail to reject the null and accept the alternative
- B
Certain assumptions are made when doing a z-test for a single mean. Which of the following is NOT one of them? a.) participants are randomly selectes b.) the sampling distribution is normal c.) the standard deviation of the population is known d.) actually, all of the above are assumptions made when doing z-test for a single mean
- D
In diagnostic testing, what is the probability of a positive test result in patients who have the condition under investigation called? a. fortitude of the test b. sensitivity of the test c. specificity of the test d. reliability of the test
- B
Which of the following is true of all independent events? a.) P (B|A) > P (A|B) b.) P (B|A) = P (B) c.) P (A)
- B
The standard normal curve a. has relative frequency along the ordinate – which add up to a unity b. can have a mean of 50 c. has a mean = median = mode d. both A and C e. all of the above are correct
- D
Ordinal variables have values A. That differ in name only B. That differ in magnitude C. In which the intervals between values are equal in size D. Both B and C
- B
The probability of occurrence of any one of several events is the sum of the individual probabilities when: a. the events are independent b. the events are mutually exclusive c. sampling is random d. the sum is less than 0.50 e. the events are conditional upon what occurred before
- B
In which of the following would you NEVER calculate the median? a. positively skewed distribution b. a normal distribution c. a distribution with a few very extreme scores at the upper end d. an open-ended distribution e. a distribution of a nominal variable
- E
A statistical inference is a.) a true statement about a population made by measuring some sample of that population b.) a guess about a population made by measuring some sample of that population c.) a true statement about a sample d.) a guess about a statistic made on the basis of a parameters
- B
Which measure of central tendency could be determined by glancing at a bar graph? A. mean B. median C. mode D. all of the above
- C
