QNT/351 Week 3

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A sample of 30 observations is selected from a normal population. The sample mean is 21, and the population standard deviation is 6. Conduct the following test of hypothesis using the 0.05 significance level.

H₀ : μ ≤ 20

H₁ : μ > 20

Is this a one- or two-tailed test?

H₀, when z > evidence to conclude that the population mean is greater than 20.

e.	What is the p-value? (Round your answer to 4 decimal places.)

p-value

H₀. The mean number of calls is than 36 per week.

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A United Nations report shows the mean family income for Mexican migrants to the United States is $27,300 per year. A FLOC (Farm Labor Organizing Committee) evaluation of 20 Mexican family units reveals a mean to be $28,500 with a sample standard deviation of $9,651. Does this information disagree with the United Nations report? Apply the 0.01 significance level.

a.	State the null hypothesis and the alternate hypothesis.


H₀: μ =	. This data the report.

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The following information is available.

H₀ : μ ≥ 220

H₁ : μ < 220

A sample of 64 observations is selected from a normal population. The sample mean is 215, and the population standard deviation is 15. Conduct the following test of hypothesis using the .025 significance level.

Is this a one- or two-tailed test?

H₀ when z < H₀. There is evidence to conclude that the population mean is greater than 10.

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Given the following hypotheses:

H₀ : μ = 400

H₁ : μ ≠ 400

A random sample of 12 observations is selected from a normal population. The sample mean was 407 and the sample standard deviation 6. Using the .01 significance level: