## Question

###### B) A manufacturer of bus engine claims that the life of the bus engine is normally distributed with standard deviation equal to 2.1 years: A random sample ofl12 of these engine has standard deviation of1.8 years Test the hypothesis that the standard deviation of the life of the bus engine is smaller than 21 years at 5% significance level (5 marks)[15 MARKS]

b) A manufacturer of bus engine claims that the life of the bus engine is normally distributed with standard deviation equal to 2.1 years: A random sample ofl12 of these engine has standard deviation of1.8 years Test the hypothesis that the standard deviation of the life of the bus engine is smaller than 21 years at 5% significance level (5 marks) [15 MARKS]

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