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Statistics and Data Analysis
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Two variables have covariance 18. If σx = 3 and σy = 6, what is the correlation coefficient?
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The mean of two groups are 50 and 70 with sizes 30 and 20 respectively. What is the combined mean?
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The mean of a dataset is 50 and the standard deviation is 10. What is the Z-score of a value 70?
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The mean of 50 observations is 20. One observation 30 was wrongly recorded as 50. What is the corrected mean?
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The mean of 40 observations is 30. If the sum of observations is increased by 80, what is the new mean?
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The marks of students are: 10, 20, 30, 40, 50. What is the coefficient of variation if mean = 30 and SD = 14.14?
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The following data are given: 2, 4, 6, 8, 10. What is the standard deviation?
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The following data are given: 10, 12, 14, 16, 18. What is the mean deviation about the mean?
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The dataset is: 4, 8, 6, 10, 12. What is the mean?
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The dataset is: 3, 5, 7, 9, 11. What is the variance?
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