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51. The ratio between experimental and observed results is represented by
a) theta value
b) chi- square
c) variance ratio
d) correlation
52. Chi-square test was developed by
a) W. S. Gosset
b) Karl Pearson
c) A. R. Fisher
d) Pascal
53. Two variables deviate in opposite directions is called
a) positive correlation
b) ideal correlation
c) inverse correlation
d) moderate positive
54. The fundamental statistical indicators are
a) Mean
b) Median
c) Variance
d) Standard deviation
55. The average of a series of numerical values is
a) The sum of the values divided by their number
b) Lower than the minimum value in the series
c) Lower than the maximum value in the series
d) An indicator of central tendency for the values of the series
56. Standard deviation
a) is the square root of variance
b) is measured using the unit of the variable
c) is measured using the squared unit of the variable
d) has values generally comparable with the average value
57. If the average of a series of values is 10 and their variance is 4, then the coefficient of variation (= ratio standard deviation / average) is
a)40%
b)20%
c)80%
d)10%
58. The median of a series of numerical values is
a) Equal to the average
b) A graph or chart
c) A number
d) A frequency table
59. The median of a series of numerical values is
a) A value for which half of values are higher & half of values are lower
b) The value located exactly midway between the minimum and maximum of the series
c) The most commonly encountered values among the series
d) A measure of the eccentricity of the series
60. In a contingency table that shows data from a clinical trial is good to have high values for
a) sick subjects, diagnosed as negative
b) sick subjects, diagnosed as positive
c) healthy subjects, diagnosed as negative
d) healthy subjects, diagnosed as positive
61. A regression line is a straight line which
a) is located as close as possible to all the points of a scatter chart
b) is defined by an equation having 2 parameters: the slope and the intercept
c) provides an approximate relation ship between the values of two parameters
d) is parallel to one of the coordinate axes
62. Pearson correlation coefficient, denoted by r, measures
a) The scattering strength of data for a statistical series
b) The strength of the correlation between the mean and median
c) The strength of the correlation between two numerical parameters
d) The tendency of simultaneous increase or decrease, or inverse evolution, for two numerical
parameters
63. The Student's t test is
a) a parametric test
b) a nonparametric test
c) a test for comparing averages
d) a test for comparing variances
64. Which of the following tests are parametric test?
a) ANOVA
b) Student
c)Wilcoxon
d) Kruskal-Wallis
65. A subset of the population selected to help make inferences on a population is called
a) a population
b) inferential statistics
c) a census
d) a sample
66. A set of all possible data values for a subject under consideration is called
a) descriptive statistics
b) a sample
c) a population
d) statistics
67. The number of occurrences of a data value is called
a) the class limits
b) the frequency
c) the cumulative frequency
d) the relative frequency
68. A large collection of data may be condensed by constructing
a) classes
b) a frequency polygon
c) class limits
d) a frequency distribution
69. What is the purpose of a summary table?
a) This is the only way to present categorical data in numerical form
b) To sum the values of responses to a survey
c) To list data to create a bar or pie chart
d) To see differences between or among categories
70. A graphical representation of a frequency distribution is called a
a) stem and leaf plot
b) scatter diagram
c) time-series plot
d) histogram
71. The width of a class interval in a frequency distribution will be approximately equal to the range of the data divided by the
a) highest value in the data set
b) lowest value in the data set
c) number of class intervals
d) average of the data set
72. The cumulative frequency for a particular class is equal to 35. The cumulative frequency for the next class will be ______
a) less than 35
b) equal to 65
c) 35 plus
d) 35 minus
73. The highest bar in a histogram represents?
a) the class with the highest cumulative frequency
b) the class with the lowest frequency
c) the class with the highest frequency
d) the class with the lowest relative frequency
74. Which of the following would be most helpful in the construction of a pie chart?
a) cumulative percentages b)frequency distribution
c) ogive
d) relative frequencies
75. The following numbers represent exam scores in botany: 78, 93, 85, 8, 73, 96, 72, 86, 90, 85. If a stem and leaf diagram is developed from this data, how many stems will be used?
a) 3
b) 5
c) 10
d) 4
76. Can a frequency distribution have overlapping classes?
a) sometimes
b) no
c) yes
d) all of the above
77. Which of the following is not a measure of central tendency?
a) mode
b) variability
c) median
d) mean
78. Which of the following is the crudest measure of dispersion?
a) mean absolute deviation
b) variance
c) mode
d) range
79. Second moment about mean is
a) SD
b) variance
c) coefficient of variation
d) none
80. The most frequently occurring value in a data set is called the
a) spread
b) mode
c) skewness
d)maximum value
81. Which of the following is true for a positively skewed distribution?
a) mode=median=mean
b) mean<median<mode
c) mode<median<mean
d)median<mode<mean
82. If the number of values in a data set is even, and the numbers are ordered, then
a) the median cannot be found
b) the median is the average of the two middle numbers
c) the median, mode and mean are equal
d)none
83. The coefficient of skewness is always zero for_________ distribution
a) symmetrical
b) skewed
c)median
d) none
84. If the correlation coefficient is zero, the slope of a linear regression line will be
a) positive
b)negative
c)positive or negative
d) none
85. Thin layer chromatography is
a) partition chromatography
b) electrical mobility of ionic species
c) adsorption chromatography
d) one of the above
86. In gas chromatography, the basis for separation of the components of the volatile material is the difference in
a) partition coefficients
b) conductivity
c) molecular weight
d) molarity
87. Which section of a paired samples t test output can be ignored?
a) regression
b) mean
c)median
d) paired samples correlation
88. A regression line is a straight line which:
a) is located as close as possible to all the points of a scatter chart
b) is defined by an equation having 2 parameters: the slope and the intercept
c) provides an approximate relationship between the values of two parameters
d) is parallel to one of the coordinate axes
89. What is the alternative name for a repeated measures t- test?
a) unrelated t-test
b) related t-test
c) a paired samples t-test
d) unpaired sample t-test
90. Conducting multiple t- tests increases the likelihood of which of the following?
a) finding correct conclusions
b) type 1 error
c) homogeneity
d) type II error
91. SPSS stands for
a) simple perfect squaredsquare
b) statistical product and service solutions
c) statistical package for social science
d) software package for statistical science
92. HPLC stands for
a) High pressure liquid chromatography
b) High performance liquid chromatography
c) both (a) amd (b)
d) Highly placed liquid chromatography
93. The eluent strength is a measure of
a) solvent absorption energy b)solvent adsorption energy
c)solvent diffusivity
d) solvent mixing index
94. Which can be used as a mobile phase in HPLC applications?
a) any compound with solubility in liquid
b) any compound with limited solubility in liquid
c) any compound with non-solubility in liquid
d) none
95. HPLC methods includes
a) liquid/liquid chromatography
b) liquid/solid chromatography
c) ion exchange and size exclusion chromatography
d) all of the above
96. For a typical adsorbent such as silica gel, the most popular pore diameters are
a) 10 and 50 A°
b) 60 and 100 A°
c) 100 and 150 A°
d) 150 and 200 A°
97. What is the possibility of having 53 Thursdays in a non-leap year?
a) 6/7
b) 1/7
c) 1/365
d) 53/365
98. The collection of one or more outcomes from an experiment is called
a) probability
b) event
c) random variable
d) Z-value
99. Which of the following is not a condition of the binomial distribution?
a) only 2 possible outcomes
b)have constant probability of success
c) must have atleast 3 trials
d) trials must be independent
100. When two coins are tossed simultaneously, what are the chances of getting atleast one tail?
a) 3/4
b) 1/5
c) 4/5
d) 1/4
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