Statistics 2

~ Exam ~

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This test has 40 questions.

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1. T-tests compare __ averages.

  a. 2

  b. 3

  c. 4

  d. 5


2. T-tests give the probability that the differences are caused by __.

  a. design

  b. chance

  c. cicumstances

  d. the data


3. It is usually said that if the probability is less than __, than the difference is "significant."

  a. 0.55

  b. 0.5

  c. 0.01

  d. 0.05


4. Group A scores are 10,10,12,15,16 and group B scores are 9, 9, 14, 16, 17. You do the unpaired t-test. The t-est is ___.

  a. 0.0235

  b. 0.1894

  c. 0.8523

  d. 1.8892


5. Data as in Q4. Degrees of freedom is ___.

  a. 2

  b. 4

  c. 6

  d. 8


6. Data as in Q4. The standard error of deviation is ____.

  a. 2.112

  b. 3.668

  c. 3.889

  d. 6.222


7. Data as in Q4. The two means are ___.

  a. 12.60

  b. 14.98

  c. 13.01

  d. a and c


8. Data as in Q4. The standards of deviation are ___.

  a. 3.66 and 5.66

  b. 2.79 and 3.81

  c. 3.11 and 4.67

  d. 1.22 ans 2.56


9. Data as in Q4 and two tailed P value of .084545 make it ___ statistically significant..

  a. very

  b. a little

  c. not

  d. sometimes


10. You use a paired test when the scores are ___.

  a. matched

  b. unmatched

  c. random

  d. even


11. Data as in Q4. For the paired test, t = ____.

  a. 0.5623

  b. 0.6667

  c. 1.5654

  d. 2.4532


12. Data as in Q4. Paired test. df= ___.

  a. 2

  b. 4

  c. 6

  d. 8


13. The paired t-test of Q4 is statistically ___.

  a. significant

  b. insignificant

  c. correct

  d. meaningful


14. The t-test is the same as ___.

  a. correlation

  b. regression

  c. ABOVA

  d. none of the above


15. The t-value will be positive if the first mean is larger than the second, and negative if it is smaller. The rule of thumb is to set the alpha (risk) level at _________.

  a. 0.2

  b. 0.3

  c. 0.4

  d. 0.5


16. In the t-test, the degree of freedom is the sum of the persons in both groups minus ___.

  a. 1

  b. 2

  c. 3

  d. 4


17. The t-test employs that statistic (t) to test a given statistical hypothesis about the ___ of a population (or about the means of 2 populations.)

  a. SD

  b. mean

  c. degrees of freedom

  d. data


18. The Standard ____ of the mean is an estimate of the SD of the sample distribution of means, based on one more random samples

  a. data

  b. deviation

  c. score

  d. error


19. A statistical test of hypothesis is referred to as a ___-sample t-test.

  a. one

  b. two

  c. three

  d. four


20. In practice, the two-sample t-test is a more commonly used statistic. This statistic can evaluate whether or not there is a significant difference in the means of ___ independently sampled populations

  a. 1

  b. 2

  c. 3

  d. 4


21. A ____ sample binomial test allows us to test whether the proportion of successes on a two-level categorical dependent variable significantly differs from the hypothesized value.

  a. 1

  b. 2

  c. 3

  d. 4


22. t-tests concern a number of procedures dealing with the comparing of two averages. It can be used to compare the number of traffic accidents on two busy junctions.

  a. true

  b. false

  c. sometime true

  d. sometimes false


23. The formula for the t-test is a ___.

  a. number

  b. ratio

  c. proportion

  d. all of the above


24. The paired t-test compares ___ paired groups.

  a. 1

  b. 2

  c. 3

  d. 4


25. Group A is 8,5,7,2,4,5 and Group B is 9,6,5,3,3,6. The Paried t- test is ___________________.

  a. 0.4434

  b. 0.4152

  c. 0.5443

  d. 0.6445


26. Data from Q25. df= ___.

  a. 2

  b. 3

  c. 4

  d. 5


27. Data from Q25. The M of Group A is __.

  a. 5.0

  b. 5.17

  c. 5.33

  d. 5.89


28. The ___ value answers this question. If the treatment really had no effect, what is the chance that random sampling would result in an average effect as far from zero (or more so) as observed in this experiment.

  a. A

  b. M

  c. P

  d. X


29. To compare ___ or more matched groups, use repeated measures one way ANOVA followed by post tests.

  a. 1

  b. 2

  c. 3

  d. 4


30. You can by ___% sure that this interval contains the true treatment effect. When the P value is larger than 0.05, the 95 confidence interval will start with a negative number.

  a. 80

  b. 85

  c. 90

  d. 95


31. If the t ratio is large, the P value will be ___.

  a. large

  b. unclear

  c. disputed

  d. small


32. Data from Q25. The two-tailed P value equals 0.6952. By conventional criteria, this difference is considered to be ___statistically significant.

  a. some

  b. always

  c. not

  d. very


33. In general, the ___ hypothesis is the logical antithesis of whatever hypothesis it is the investigator is seeking to examine.

  a. real

  b. opposite

  c. null

  d. calculated


34. Usually, the null hypothesis is that the difference is __.

  a. 0

  b. 1

  c. 2

  d. 3


35. The null hypothesis is put forward to allow the data to ___ it.

  a. explain

  b. agree with

  c. proof

  d. contradict


36. The result of the t-test is a t value, this value is then used to determine the ___ value.

  a. a

  b. d

  c. f

  d. p


37. There are two types of t-tests, the __ and the paired t-test.

  a. unpaired

  b. simple

  c. standard

  d. mean


38. In this ___t-test, your samples are related. You collect data before and after some manipulation.

  a. unpaired

  b. paired

  c. related

  d. group


39. This ___ t-test is used when you have samples that are not directly related.

  a. unpaired

  b. paired

  c. group

  d. sample


40. The Cochran variant of the t-test is used when the SD of the independent sets ___ significantly.

  a. differ

  b. do not differ

  c. both a and b

  d. neither.