8. Specify the null and alternative hypothesis in the following cases: a. A chem
ID: 2947778 • Letter: 8
Question
8. Specify the null and alternative hypothesis in the following cases: a. A chemical engineer hopes to establish that an additive will increase the b. An electrical engineer wants to establish that a modified circuit board will c. The manufactured bearing in industry is classified according to its tolerance viscosity of an oil. give a computer a higher average operating speed. and vibration level by class 1,2 and 3. Class 1 bearing is the bearing with most perfect fitness where all its components are exact with its dimension. A mechanical engineer wants to show that a new process produces more Class 1 bearings. d. A university admissions officer was concerned that males and females were accepted at different rates into the four different schools (business, engineering, liberal arts, and science) at her university. e. A manufacturer of a certain brand of cement claims that on average the curing rate is 20 days for full strength. f. A random sample of 100 deaths in Canada during the past year showed an average life span of 72.9 years. Is the life span today more than 70 years?Explanation / Answer
a. H0: The aditive does not increases the viscosity of an oil.
Ha: The aditive increases the viscosity of an oil.
b. H0: The modified circuit board does not give a higher average operating speed.
Ha: The modified circuit board give a higher average operating speed.
c. H0: The new process produces same class 1 bearings as old process.
Ha: The new process produces more class 1 bearings.
d. H0: The males and females are accepted at same rate into the 4 different schools.
Ha: The males and females are accepted at different rates into the 4 different schools.
e. H0: The average curing rate is 20 days for full strength.
Ha: The average curing rate is not 20 days for full strength.
f. H0: The todays average life span is 70 years.
Ha: The todays average life span is more than 70 years.
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