Basic Statistics: Descriptive Statistics and Sampling

~ Exam ~

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1. This problem is for Question 1-5: You have these numbers: 3, 5, 4, 7, 9 The mean is ___
  a. 4
  b. 5
  c. 6
  d. 5.6
2. The median is __
  a. 4
  b. 5

  c. 6
  d. 5.6
3. The standard deviation is __
  a. 2.00
  b. 2.41
  c. 2.68
  d. 3.00
4. The variance is ___
  a. 2.0
  b. 3.8
  c. 4.8
  d. 5.8
5. The range is __
  a. 4
  b. 5
  c. 6
  d. 7
6. Homicide rate (death/100.000) is ___ data.
  a. nominal
  b. ordinal
  c. continious
  d. categorical
7. High School graduation (yes/no) is ___ data.
  a. ordinal
  b. nominal
  c. continious
  d. binary
8. Smoking status (none, light, heavy) is __ data.
  a. ordinal
  b. continuios
  c. dichotomous
  d. none of the above
9. A frequency distribution positively skewed is skewed __.
  a. to the left
  b. to the right
  c. with two peaks
  d. bell shaped
10. In a normal distribution,
  a. the mean will equal the median
  b. the distribution will be symetrical
  c. the mean will be larger than the median
  d. a and b
11. When sample size increases, __ will generally remain the same.
  a. mean
  b. maximum
  c. Standard Deviation
  d. a and c
12. 95% of all observations fall within __ standard deviation(s).
  a. 1
  b. 2
  c. 3
  d. 4
13. the p-value is always between ___.
  a. 0 and 2
  b. 0 and 1
  c. 1 and 2
  d. 0 and .99
14. Compare one group of binomial data to hypothetical value with ___.
  a. chi-square
  b. t-test
  c. ANOVA
  d. correlation
15. Compare two groups with
  a. chi-square
  b. t-test
  c. ANOVA
  d. correlation
16. Comare 3 or more groups with __
  a. chi-square
  b. t-test
  c. ANOVA
  d. correlation
17. Qualify the association beteen 2 variable with __
  a. chi-square
  b. t-test
  c. ANOVA
  d. correlation
18. The data for the next 4 quastions are 3.4, 6.3, 7.8, 9.7, 2.1 The mean is ___
  a. 4.32
  b. 5.84
  c. 5.96
  d. 6.05
19. The standard deviation is __.
  a. 2.5
  b. 3.5
  c. 4.0
  d. 4.5
20. The t-score at a 0.05 level of significance and a hypothesized value of 0 is ___ .
  a. 15.00
  b. 16.33
  c. 16.69
  d. 17.42
21. On the basis of the above date, the hypothesis would be __.
  a. accepted
  b. rejected
  c. confirmed
  d. deleated
22. In a correlation, the value of "r" can be from __ to ___.
  a. 0 to 1
  b. -1 to 0
  c. -1 to +1
  d. all of the above
23. A correlation of .45 shows a ___ .
  a. direct
  b. negative
  c. positve
  d. 1 and 3
24. You are given that the distribution of adolescents IQ scores is normal in shape with a mean of 100 and a standard deviation of 15 points. What is the percentile rank of a child whose IQ is 120? __ percentile
  a. 79
  b. 87
  c. 91
  d. 98
25. If the numbers are .5; .7; .2; .9; .3; .6; .4; the n=
  a. 5
  b. 7
  c. 8
  d. 9
26. If the numbers are .5; .7; .2; .9; .3; .6; .4; the mean=
  a. 0.51
  b. 0.33
  c. 0.49
  d. 0.55
27. If the numbers are .5; .7; .2; .9; .3; .6; .4; the median=
  a. .3
  b. .4
  c. .5
  d. .6
28. If the numbers are .5; .7; .2; .9; .3; .6; .4; the maximun =
  a. .10
  b. .7
  c. .8
  d. .9
29. If the numbers are .5; .7; .2; .9; .3; .6; .4; the minimum=
  a. .1
  b. .15
  c. .2
  d. .25
30. If the numbers are .5; .7; .2; .9; .3; .6; .4; the range=
  a. .6
  b. .7
  c. .8
  d. .9
31. If the numbers are .5; .7; .2; .9; .3; .6; .4; the scewness=
  a. .22
  b. .24
  c. .34
  d. .36
32. If the number are 345, 765, 876, 134, 598, then n=
  a. 3
  b. 4
  c. 5
  d. 6
33. If the number are 345, 765, 876, 134, 598, then mean=
  a. 530.6
  b. 540.6
  c. 543.6
  d. 578.6
34. If the number are 345, 765, 876, 134, 598, then median=
  a. 549
  b. 566
  c. 589
  d. 598
35. If the number are 345, 765, 876, 134, 598, then SD=
  a. 203.01
  b. 304.01
  c. 330.01
  d. 330
36. If the number are 345, 765, 876, 134, 598, then variance=
  a. 467
  b. 83457.2
  c. 92420.3
  d. 95442.4
37. If the mean is 500 and the hypothized mean 450, the SD 300, and n=5, the t-test is
  a. 0.22
  b. .32
  c. .37
  d. .39
38. If the mean is 500 and the hypothized mean 450, the SD 300, and n=5, using .05 level of significance, the hypothetical value is
  a. accepted
  b. not accepted
  c. maybe accepted
  d. mabe not accepted
39. If the mean is 500 and the hypothized mean 450, the SD 300, and n=5, the 95% confidence interval of a upper limit of the sample mean is
  a. 756.33
  b. 813.45
  c. 872.44
  d. 954.76
40. If the mean is 500 and the hypothized mean 450, the SD 300, and n=5, the 95% lower limit of the confidence interval of a sample mean is
  a. 127.56
  b. 145.76
  c. 156.76
  d. 189.76
41. In an unpaied t-test, Group 1 shows 10,15,20 and group 2 shows 20,30,40. What is the t-test score?
  a. 2.1112
  b. 2.1221
  c. 2.3230
  d. 3.5557
42. In an unpaied t-test, Group 1 shows 10,15,20 and group 2 shows 20,30,40. What is the P value?
  a. .0203
  b. .0607
  c. .0704
  d. .0808
43. In an unpaied t-test, Group 1 shows 10,15,20 and group 2 shows 20,30,40. Is the score statistically significant?
  a. yes
  b. no
  c. maybe
  d. maybe not
44. In an unpaied t-test, Group 1 shows 10,15,20 and group 2 shows 20,30,40. What is the standard error of the difference?
  a. 4.666
  b. 6.455
  c. 7.346
  d. 7.866
45. Descriptive units are like
  a. 2.3; 5.6, 7.5
  b. A, B, C, D
  c. 4 points, 3 points, 2 points, 1 point
  d. b and c
46. An interval unit is a
  a. test score
  b. descriptive unit
  c. proscripive unit
  d. random number
47. An example of a compound unit is
  a. miles/galon
  b. words/minute

  c. units per pupil cost
  d. all 3
48. The first quartile is that point in a distribution below which ___per cent of the cases lie.
  a. 15
  b. 25
  c. 50
  d. 75
49. If the first and third quartiles in a distribution are 12 and 40, the quartile deviation is
  a. 15
  b. 16
  c. 17
  d. 18
50. In a normal curve, two standard deviations from the mean cover ___%
  a. 68%
  b. 75%
  c. 85%
  d. 95%
51. If all values on a scatter diagram lie in a straight line, the correlation is
  a. .5
  b. 1
  c. 1.5
  d. 2
52. If high values on one variable are associated with low values on another variable, the correclation is
  a. positive
  b. negative
  c. limited
  d. reverse
53. A random sample is drawn so that every member of the ___ has an equal chance of being chosen.
  a. sample
  b. population
  c. variable group
  d. group
54. Populations may be chose with respect to
  a. size
  b. homogenisity
  c. existance
  d. all 3
55. A ___ sample is a random sample chose within a subgroup.
  a. stratified
  b. select
  c. group
  d. limited
56. A ___ is a tentative assumption which is tested from a sample.
  a. thesis
  b. hypothesis
  c. hypothesus
  d. assumption
57. Which is a good hypothesis?
  a. Are men or women taller?
  b. Man are taller than woman
  c. Men and women are the same height.
  d. Woman are taller than men
58. When two groups are compared, ___ is appropriate for the test of significance of the two groups.
  a. T
  b. R
  c. t
  d. n
59. Statistics concerns the ____ statement of evidence.
  a. design
  b. numerical
  c. arithmetic
  d. statistical
60. In statistics, the use of percentages is ___ justified.
  a. always
  b. seldom
  c. never
  d. often