Question: A z -statistic is used for a problem involving any sample size and an unknown population standard deviation. True or False 2.The mean weight of

Az-statistic is used for a problem involving any sample size and an unknown population standard deviation.

True or False

2.The mean weight of trucks traveling on a particular section of I-475 is not known. A state highway inspector needs an estimate of the population mean. He selects and weighs a random sample of 49 trucks and finds the mean weight is 15.8 tons. The population standard deviation is 3.8 tons. What is the 68%, 95%and 99% confidence interval for the population mean?

3.Which statement(s) is(are) correct about thet-distribution?

A) The mean is zero.

B) Its shape is symmetric.

C) Its dispersion is based on degrees of freedom.

D) All apply.

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