Unformatted text preview: about. 12.104 a. Using the data we get a mean of 31.952 which is greater than 30 as well as the p-value equaling to .0015 which is lower than .05. Therefore we can reject the null and say that the average housing spends more than 30% on housing each year. b. By using a 95% confidence interval we get a mean of 31.952% of annual income spent on their housing per year. 12.115 After gathering the data the standard deviation and the p-value for the results are both much higher than they should be. Therefore we have enough statistical evidence to infer the number of springs requiring reworking is unacceptably large. 12.116 In a 90% confidence interval we are able to conclude that 86% of the springs are a correct length which is not enough to infer the springs are a correct length....
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