stats data bank
81. A statistician wishes to examine the relationship between average monthly rainfall (in mm), x, and number of road accidents, y, in a particular city. The following calculations have been done for you:åx = 265,åx2 = 6982,åy = 193,åy2 = 3421,åxy = 4842 and n = 12. The coefficient of correlation between average monthly rainfall and number of road accidents is:
a. 0.899
b. 0.969
c. 0.974
d. 0.977
e. 1.000
82. A statistician wishes to examine the relationship between average monthly rainfall (in mm), x, and number of road accidents, y, in a particular city. The following calculations have been done for you:åx = 276,åx2 = 6888,åy = 193,åy2 = 3421,åxy = 4842 and n = 12. The coefficient of correlation between average monthly rainfall and number of road accidents is:
a. 0.899
b. 0.969
c. 0.974
d. 0.977
e. 1.000
83. A statistician wishes to examine the relationship between average monthly rainfall (in mm), x, and number of road accidents, y, in a particular city. The following calculations have been done for you:åx = 276,åx2 = 6982,åy = 185,åy2 = 3421,åxy = 4842 and n = 12. The coefficient of correlation between average monthly rainfall and number of road accidents is:
a. 0.899
b. 0.969
c. 0.974
d. 0.977
e. 1.000
84. You have been given a two-variable data set with the following calculations already completed: åx = 496,åx2 = 37306,åy = 508,åy2 = 39352,åxy = 38309 and n = 7. The coefficient of correlation between x and y is given by:
a. 0.998
b. 0.999
c. 1.000
d. 0.945
e. 0.922
85. You have been given a two-variable data set with the following calculations already completed: åx = 496,åx2 = 37306,åy = 508,åy2 = 39352,åxy = 38309 and n = 8. The coefficient of correlation between x and y is given by:
a. 0.998
b. 0.999
c. 1.000
d. 0.945
e. 0.922
86. You have been given a two-variable data set with the following calculations already completed: åx = 496,åx2 = 37306,åy = 508,åy2 = 39352,åxy = 38309 and n = 9. The coefficient of correlation between x and y is given by:
a. 0.998
b. 0.999
c. 1.000
d. 0.945
e. 0.922
87. You have been given a two-variable data set with the following calculations already completed: åx = 496,åx2 = 37306,åy = 508,åy2 = 39352,åxy = 38309 and n = 10. The coefficient of correlation between x and y is given by:
a. 0.998
b. 0.999
c. 1.000
d. 0.945
e. 0.922
88. You have been given a two-variable data set with the following calculations already completed: åx = 72,åx2 = 1544,åy = 37,åy2 = 305,åxy = 654 and n = 5. The coefficient of correlation between x and y is given by:
a. 0.963
b. 0.933
c. 0.941
d. 0.945
e. 0.922
89. You have been given a two-variable data set with the following calculations already completed: åx = 72,åx2 = 1544,åy = 37,åy2 = 305,åxy = 654 and n = 10. The coefficient of correlation between x and y is given by:
a. 0.963
b. 0.933
c. 0.941
d. 0.945
e. 0.922
90. You have been given a two-variable data set with the following calculations already completed: åx = 72,åx2 = 1544,åy = 37,åy2 = 305,åxy = 654 and n = 15. The coefficient of correlation between x and y is given by:
a. 0.963
b. 0.933
c. 0.941
d. 0.945
e. 0.922
91. You have been given a two-variable data set with the following calculations already completed: åx = 72,åx2 = 1544,åy = 37,åy2 = 305,åxy = 654 and n = 20. The coefficient of correlation between x and y is given by:
a. 0.963
b. 0.933
c. 0.941
d. 0.945
e. 0.922
92. The marketing manager of a large supermarket chain would like to determine the effect of shelf space (X) on the sales (Y) of pet food. A random sample of 12 equal-sized stores is selected. Some calculations have been done for you: SSx = 375, SSy = 3.0025 and SSxy = 27.75. What is the value of the covariance?
a. 2.52
b. 2.55
c. 2.64
d. 2.73
e. 2.31
93. The marketing manager of a large supermarket chain would like to determine the effect of shelf space (X) on the sales (Y) of pet food. A random sample of 12 equal-sized stores is selected. Some calculations have been done for you: SSx = 400, SSy = 3.0025 and SSxy = 28. What is the value of the covariance?
a. 2.52
b. 2.55
c. 2.64
d. 2.73
e. 2.31
94. The marketing manager of a large supermarket chain would like to determine the effect of shelf space (X) on the sales (Y) of pet food. A random sample of 12 equal-sized stores is selected. Some calculations have been done for you: SSx = 375, SSy = 3.5 and SSxy = 29. What is the value of the covariance?
a. 2.52
b. 2.55
c. 2.64
d. 2.73
e. 2.31
95. The marketing manager of a large supermarket chain would like to determine the effect of shelf space (X) on the sales (Y) of pet food. A random sample of 12 equal-sized stores is selected. Some calculations have been done for you: SSx = 375, SSy = 3.0025 and SSxy = 30. What is the value of the covariance?
a. 2.52
b. 2.55
c. 2.64
d. 2.73
e. 2.31
96. You have been given a two-variable data set with the following calculations already completed: åx = 496,åx2 = 37306,åy = 508,åy2 = 39352,åxy = 38309 and n = 7. The covariance between x and y is given by:
a. 385.60
b. 973.29
c. 1289.07
d. 1456.91
e. 476.20
97. You have been given a two-variable data set with the following calculations already completed: åx = 496,åx2 = 37306,åy = 508,åy2 = 39352,åxy = 38309 and n = 8. The covariance between x and y is given by:
a. 385.60
b. 973.29
c. 1289.07
d. 1456.91
e. 476.20
98. You have been given a two-variable data set with the following calculations already completed: åx = 496,åx2 = 37306,åy = 508,åy2 = 39352,åxy = 38309 and n = 9. The covariance between x and y is given by:
a. 385.60
b. 973.29
c. 1289.07
d. 1456.91
e. 476.20
99. You have been given a two-variable data set with the following calculations already completed: åx = 496,åx2 = 37306,åy = 508,åy2 = 39352,åxy = 38309 and n = 10. The covariance between x and y is given by:
a. 385.60
b. 973.29
c. 1289.07
d. 1456.91
e. 476.20
100. You have been given a two-variable data set with the following calculations already completed: åx = 72,åx2 = 1544,åy = 37,åy2 = 305,åxy = 654 and n = 5. The covariance between x and y is given by:
a. 30.3
b. 43.1
c. 34.0
d. 27.4
e. 31.9
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