Question

Answers to the following questions should be calculated in Matlab and given to 4 decimal places. Be careful not to introduce errors by rounding in any intermediate calculations as this may lead to an incorrect final answer. A confidence interval is desired for the true average load loss u (watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. A random sample of 49 motors were tested and the sample mean load loss was found to be 59.6 and the sample standard deviation was 3.5 (a) Find the standard error of the sample mean, . (b) State the degrees of freedom. 数字 (c) Find the critical value t* required for a 95% confidence interval. (d) Give a 95% confidence interval for μ. Enter your answer using the syntax (lower, upper) for example (1.0001, 2.2222). Answers to the following questions should be calculated in Matlab and given to 4 decimal places. Be careful not to introduce errors by rounding in any intermediate calculations as this may lead to an incorrect final answer. In a certain state, 300 urban residents were surveyed and and it was found that 57 were in favour of increasing the speed limit from 100 km/h to 110 km/h. A survey of 180 rural residents from the same state was also conducted and it was found that 41 supported increasing the speed limit from 100 km/h to 110 km/h Let π be the proportion of residents in the urban population in favour of increasing the speed limit and let be the proportion of residents in the rural population. Test, at the 5% level of significance, the hypothesis Ho2 (a) Give the value of z-statistic (b) Find the P-value. 國自 (c) Which of the following conclusions apply? Accept H0 : π1 = π2 0 Reject H0 : π1 = π2

Answer 1

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