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 million (ppm). A consumer health group measured the level of the chemical in random 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 greaterthanorequalto 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 7.2 minutes. A long-distance telephone company wants to perform a hypothesis test to determine whether the average a duration of long-distance phone calls has changed from the 1990 mean of 7.2 minutes. A) Two-tailed B) Left-tailed C) Right-tailed A confidence interval (CI) for the difference mu_1 - mu_2 between two population means is given. Interpret the confidence interval. 95% CI from -20 to 230 A) We can be 95% confident that mu_1 - mu_2 lies somewhere between 20 and 230. Equivalently, we can be 95% confident that mu_1 is somewhere between 20 less than and 230 more than mu_2. B) We can be 95% confident that mu_1 and mu_2 both lie somewhere between -20 and 230. C) We can be 95% confident that mu_2 - mu_1 lies somewhere between 20 and 230. Equivalently, we can be 95% confident that mu_2 is somewhere between 20 less than and 230 more than mu_2. D) We can be 95% confident that mu_1 - mu_2 lies somewhere between -20 and 230. Equivalently, we can be 95% confident that mu_1 is somewhere between 20 less than and 230 more than mu_2.

Explanation / Answer

11) Correct answer: Option (D)
12) Correct answer: Option (A)

13) Correct answer: Option (D)

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