4. Chi-square distribution can be applied for: (a) For both negative and positive skewed curves. (c)For positive skewed curves only. (b) For negative skewed curves only. 5. The variance (S) for t-distribution test is: (a) 01 6. t-distribution can be used instead of normal distribution if: (a) o is known and n<30/ (b) o is known and n>30 (c)o is unknown and n<30

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