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For which of the following is a t-test appropriate for performing a hypothesis test? - A...

For which of the following is a t-test appropriate for performing a hypothesis test?

- A convenient sample of 23 individuals is taken from the residents of a city with approximately normally distributed commute times. The sample mean is 19 minutes and the sample standard deviation is 2 minutes.

- A population is used to obtain a sample mean of 53 and a sample standard deviation of 7 based on a convenient sample of size 19.

- A sample mean of 70 and sample standard deviation of 7 are obtained using a simple random sample of size 19 from a normally distributed population.

- A sample mean of 194 pages and a standard deviation of 37 pages are obtained using a simple random sample of 30 books from a public library having approximately normally distributed numbers of pages. The population standard deviation is 31.4 pages.

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