Researchers want to see if letting factory workers listen to music will affect productivity. The population in this factory produces a mean of μ = 100 niblits per hour with a σ = 10. The managers of this factory choose one worker to listen to music through headphones for a week. After a week they produce 112 niblits per hour.

Population 1:

Population 2:

Research Hypothesis:

Null Hypothesis:

To convert the sample score to Z score use: Z = (X - M) / SD

Sample Z- Score: Z=

Is this a one tailed or two tailed hypothesis?

I want to be sure that my result can only happen 5% of the time if the null hypothesis is true. Use the Z-table to find out what the cutoff should be.

Cutoff Z-Score: Z=  

Decision:

Interpretation: