Question

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 the effect of sample size.

Answer #1

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...

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...

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...

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...

True or false? A larger sample size produces a longer confidence
interval for μ.
False. As the sample size increases, the maximal error
decreases, resulting in a shorter confidence interval.True. As the
sample size increases, the maximal error decreases, resulting in a
longer confidence interval. True. As the
sample size increases, the maximal error increases, resulting in a
longer confidence interval.False. As the sample size increases, the
maximal error increases, resulting in a shorter confidence
interval.
True or false? If the...

Problem #1 Confidence Interval for Means using the t and
z Distribution. Psychologists studied
the percent tip at a restaurant when a message indicating that the
next day’s weather would be nice was written on the bill. Here are
tips from a random sample of patrons who received such a bill,
measured in percent of the total bill:
20.8 18.7
19.9 20.6
21.9 23.4
22.8 24.9
22.2 20.3
24.9 22.3
27.0 20.4
22.2 24.0
21.1 22.1
22.0 22.7
Open an...

Answer the question.
CHAPTER 8: ESTIMATION AND CONFIDENCE INTERVALS
1. As degrees of freedom increase, the t-distribution approaches
the:
A. binomial distribution
B. exponential distribution
C. standard normal distribution
D. None of the above
2. Given a t-distribution with 14 degrees of freedom, the area
left of - 1.761 is
A. 0.025
B. 0.05
C. 0.10
D. 0.90
E. None of the above
3. 100 samples of size fifty were taken from a population with
population mean 72. The sample...

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