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drive google.com 11. How many samples are best when dealing with t-test? A. cannot be determined C. smaller than 30 B. exactly 30 D. equal or larger than 30 12. Which test statistic will be used if the sample is 37? A. t-test C. population mean B. z-test D. standard deviation 13. Which statistical method can you use when you have a normal distribution of data? A. t-test only C. either t-test or z-test B. z-test only D. neither t-test nor z-test For nos. 14-15, refer to the problem below: A tire manufacturer claims that its tires have a mean life of 40,000 kms, A random sample of 46 of these tires is tested and the sample mean is 38,000 kms. Assume that the populations standard deviation is 2,000 kms