The maximum acceptable level of a certain toxic chemical in vegetables has been

Question

The maximum acceptable level of a certain toxic chemical in vegetables has been set at 0.3 parts per millon(ppm). A consumer health group measured the level of the chemical in a random sample of tomatoes obtained from one producer to determine whether the mean level of the chemical in these tomatoes exceeds the recommended limit. A) H_0: mu 0.3 ppm. B) H_0: mu > 0.3 ppm H_a: mu = 0.3 ppm C) H_0: mu = 0.3 ppm H_a: mu lessthanorequalto 0.3 ppm D) H_0: mu = 0.3 ppm H_a: mu > 0.3 ppm In 1990, the average duration of long-distance telephone calls originating in one town was 72 minutes. A long-distance telephone company wants to perform a hypothesis test to determine whether the average long distance phone calls has changed from the 1990 mean of 7.2 minutes. A) Two-tailed B) Left-tailed C) Right-tailed

Explanation / Answer

12)it is two tailed.

You must always keep in mind that two tailed test is non-directional, where we do not need to check if our parameter is increased or decreased.

Here also we need to check if it has changed ; do not need to check for direction, hence two tailed.

please reply for doubt/

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