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11 July, 08:18

Which of the following statements are true? a) The sample mean is an unbiased estimate of the population mean. b) The z-critical value is an estimate of the population mean. c) The t-critical value is an estimate of the population standard deviation. d) The sample standard deviation is an unbiased estimate of the population standard deviation. e) None of the above.

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  1. 11 July, 11:18
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    e) None of the above.

    Step-by-step explanation:

    a) The sample mean is an unbiased estimate of the population mean.

    False. Population mean can be estimated with a margin of error around the sample mean in a specified confidence level

    b) The z-critical value is an estimate of the population mean.

    False. z value is a conversion of values in standard normal distribution

    c) The t-critical value is an estimate of the population standard deviation.

    False. Similar to z-score t-value is a conversion in t-distribution.

    d) The sample standard deviation is an unbiased estimate of the population standard deviation

    False. It is a biased estimate.
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