PSYC2015_Test_3

# PSYC2015_Test_3 - Test 3 1. Statistics are to _ as...

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Test 3 1. Statistics are to ___________ as parameters are to _________________. a. psychology, engineering b. samples, populations c. prior beliefs, posterior beliefs 2. Identify the correct statement a. a random sample can be unrepresentative of the population b. a random sample cannot be unrepresentative of the population 3. The standard error of a statistic a. Decreases in proportion to the square root of the sample size b. Quantifies random error in the estimate c. Both alternatives a and b 4. Specifying the sampling plan requires the researcher to determine the a. the target population

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b. the number of participants c. the sampling technique d. all of the above 5. The statistic r 2 is called the coefficient of determination and it estimates a. the degree to which a relation between variables is linear b. the amount of variance accounted for in one variable by another c. both alternatives a and b 6. What is summation (X – M ) 2 / n if M is the mean of a set of scores, X is an individual score, n is the number of scores, and Sigma stands for summation? a. variance b. standard deviation c. both alternatives a and b 7. Which of the following is NOT used as a descriptive statistic? a. r b. t
c. Variance d. Mean 8. The descriptive use of statistics involves a. Estimating the true values of parameters in the population b. Summarizing a set of data by central tendency and variability 9. A sample is a subset of the a. Dependent variables b. Independent variables c. Variance d. Population 10. The entire collection of individuals, objects, or events to which one wishes to generalize the results of research is called the a. dependent variables b. sample c. population d. primary variance 11. An independent samples t -test could be used to

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a. compare two means from randomly assigned groups b. compare two means from matched groups c. compare three means from randomly assigned groups d. compare three means from matched groups 12. Identify the correct statement a. the substantive research hypothesis can be tested directly by statistical significance testing b. the substantive research hypothesis can NOT be tested directly by statistical significance testing 13. A researcher states that results of a statistical test were significant , p < 0.5. This means that a. the results were definitely not due to chance b. the rejection region was determined by setting alpha = .05 c. the rejection region was determined by setting beta = .05 14. Generalizing results to the target population requires inferring from a. the accessible population to the target population b. the sample to the accessible population
c. both alternatives a and b

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## This note was uploaded on 09/09/2011 for the course PSYC 2015 taught by Professor Unknown during the Spring '09 term at Georgia Institute of Technology.

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PSYC2015_Test_3 - Test 3 1. Statistics are to _ as...

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