Question

In: Math

You may need to use the appropriate appendix table or technology to answer this question. Consider...

You may need to use the appropriate appendix table or technology to answer this question.

Consider the following hypothesis test.

H0: μ = 30

Ha: μ ≠ 30

The population standard deviation is 14. Use  α = 0.05. How large a sample should be taken if the researcher is willing to accept a 0.10 probability of making a type II error when the actual population mean is 34?

Solutions

Expert Solution

True mean   µ =    34                              
hypothesis mean,   µo =    30                              
                                      
Level of Significance ,    α =    0.05                              
std dev =    σ =    14                              
ß=       0.1                              
δ=   µ - µo =    4                              
                                      
Z (α/2)=       1.9600   [excel function: =normsinv(α/2)                          
                                     
Z (ß) =        1.2816   [excel function: =normsinv(ß)                         
                                      
sample size needed =    n = ( ( Z(ß)+Z(α/2) )*σ / δ )² = ( (   1.2816   +   1.960   ) *   14.0   /   4   ) ² =   128.72
                                      
so, sample size =        129                              


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