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Which of the following is true about t-distributions? 1. they are left skewed 2. They are specified by one parameter : mean 3. They have

Which of the following is true about t-distributions? 1. they are left skewed 2. They are specified by one parameter : mean 3. They have less probability in the tails than the standard normal distribution 4. The peak of t density curve is lower than that of the normal density for finite sample size

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