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In: Statistics and Probability

In 2002 the mean age of an inmate on death row was 40.7 years with a...

In 2002 the mean age of an inmate on death row was 40.7 years with a standard deviation of 9.6 years. A sample of 32 current death row inmates shows a mean age of 38.9 years. Does this indicate that the mean age of death row inmates is less than in 2002?

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Expert Solution

Here we will use we will use one sample Z-test since sample size is > 30 and population standard deviation is given

So here we want to test that  mean age of death row inmates is less than in 2002

let X denote the age of an inmate on death row

the procedure for z-test is as follows

(5) Conclusion

It is concluded that the null hypothesis Ho is not rejected. Therefore, there is not enough evidence to claim that the mean age of death row inmates is less than in 2002, at the 0.05 significance level.

orchestra answered 2 years ago
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