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. 

H_{0} : μ ≤ 20 
H_{1} : μ > 20 
a. 
Is this a one or twotailed test? 



H_{0}, when z > evidence to conclude that the population mean is greater than 20. 
e. 
What is the pvalue? (Round your answer to 4 decimal places.) 
pvalue 
H_{0}. 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. 


H_{0}: μ = 
. This data the report. 
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The following information is available. 
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. 
a. 
Is this a one or twotailed test? 



H_{0} when z < H_{0}. There is evidence to conclude that the population mean is greater than 10. 
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Given the following hypotheses: 
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: 
a. 
State the decision rule. (Negative amount should be indicated by a minus sign. Round your answers to 3 decimal places.) 
Reject H_{0} when the test statistic is the interval ([removed], [removed]). 
b. 
Compute the value of the test statistic. (Round your answer to 3 decimal places.) 
Value of the test statistic 
[removed] 
c. 
What is your decision regarding the null hypothesis? 



[removed] 
Reject 
[removed] 
Do not reject 



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