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 μ (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 48 motors were tested and the sample mean load loss was found to be 56.1 and the sample standard deviation was 2.5.

(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)

Answer #1

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 μ (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 52 motors were tested...

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 56 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...

A confidence interval is desired for the true average stray load
loss µ, measured in watts for a certain type of induction motor
when the line current is held at 10 amps for a speed of 1500 rpm.
Assume the stray load loss is normally distributed with σ =
3.0.
(a) Compute a 95% confidence interval when x¯ = 58.3 and n =
25
(b) Repeat (a) but now assume n = 100. Compare the two intervals
and comment on...

A CI is desired for the true average stray-load loss μ (watts)
for a certain type of induction motor when the line current is held
at 10 amps for a speed of 1500 rpm. Assume that stray-load loss is
normally distributed with σ = 3.3. (Round your answers to two
decimal places.)
(a) Compute a 95% CI for μ when n = 25 and x = 56.0. . watts
(b) Compute a 95% CI for μ when n = 100...

A CI is desired for the true average stray-load loss ? (watts)
for a certain type of induction motor when the line current is held
at 10 amps for a speed of 1500 rpm. Assume that stray-load loss is
normally distributed with ? = 2.9. (Round your answers to two
decimal places.) (a) Compute a 95% CI for ? when n = 25 and x =
57.2. , watts (b) Compute a 95% CI for ? when n = 100...

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