Which of the following statements is correct? (a) The t distribution is exactly equal to the standard normal distribution when the sample size is equal to 30 (b) The t distribution is approximately equal to the standard normal distribution when the sample size is 150 (c) The t distribution is exactly equal to the standard normal distribution when the sample size is less than 30 (d) The t distribution is approximately equal to the standard normal distribution when the sample size is less than 30

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