Question

A 95% confidence interval for the mean of a population is computed to be 6 to 14. Which one of the following claims would the interval tend to support?

A. The population mean is more than 7

B. The population mean is less than 15.

C. The population mean is exactly 9.

D. The population mean is between 8 and 10.

E. The population mean is more than 17.

(b) A 90% confidence interval for the mean of a population is computed to be 135 to 160. Which one of the following claims would the interval tend to refute?

A. The population mean is more than 140.

B. The population mean is more than 110.

C. The population mean is between 140 and 150.

D. The population mean is less than than 125.

E. The population mean is less than 150.

Answer #1

Thank you.

Problem 6 :
The time to fly between New York City and Chicago is
uniformly distributed with a minimum of 100 minutes and a maximum
of 150 minutes.
1.What is the probability that a flight takes less
than 135 minutes?
A-P(X<135)=0.5
B-P(x<135) = 0.7
C-P(X<135)=0.135
D-P(X<135)=0.15
2.What is the probability that a flight takes less
than 110 minutes?
A-P(x<110) = 0.2
B-P(X<110)=0.1
C-P(X<110)=1.1
D-P(X<110)=0
3.What is the probability that a flight takes more
than 140 minutes?
A-P(x> 140)=0.14
B-P(x> 140)=1.4...

A 95% confidence interval for a population mean is determined to
be 100 to 120. A. Multiple Choice. What is the sample mean? a) 100
b)110 c)120 d)Not enough information to determine B. What is the
margin of error? a)5 b)10 c)20 d) 100 e) Not enough information to
determine C. IF the conflidence level is reduced to 90%, which of
the following is a viable option for the limits of the interval? a)
(85,135) b) (85,130) c) (105,115) d)...

A researcher computed 90%, 95%, 98% and 99% confidence intervals
for a population mean. However, he forgot to record which interval
was which, and he cannot find the sample data to allow him to
recreate the intervals from scratch. He now needs only the 99%
confidence interval. Which one is it?
a-(37.9, 42.1)
b-(38.4, 41.6)
c-(38.1, 41.9)
d-(38.7, 41.3)

Q10. If population mean is included in the 95% confidence
interval then
a. 99% confidence interval will always include the mean
b. 90% confidence interval will never include that mean
c. 99% confidence interval will never include that mean
d. 90% confidence interval will always include the mean

For a given population with unknown mean
The size of the 95% confidence interval for the mean is
smaller than that of the 99% confidence interval
True
b)
False
In a Least Square Method, the Coefficient of
Determination
Provides the value of the slope of the SLR model
True
b)
False
Can vary between 0 and 1
True
b)
False
Can vary between -1 and 1
True
b)
False
Provides the intercept of the SLR model...

If (14.5, 33.708) is a 95% confidence interval for a population
mean, which of the following would be a 98% confidence interval
calculated from the same set of sample data that was used to create
the 95% confidence interval above? Round your answer to three
decimal places.
a-(12.707, 35.501)
b-(12.809, 39.191)
c-(11.482, 36.726)
d-(14.617, 31.683)

A researcher is interested in finding a 95% confidence interval
for the mean number of times per day that college students text.
The study included 125 students who averaged 36.6 texts per day.
The standard deviation was 21.6 texts. Round answers to 3 decimal
places where possible.
a. To compute the confidence interval use a ? z
t distribution.
b. With 95% confidence the population mean number of texts per
day is between and texts.
c. If many groups of 125 randomly...

If you construct a 90% confidence interval for the population
mean instead of a 95% confidence interval and the sample size is
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become wider d. cannot tell without further information.

compute a 95% confidence interval for the population
mean based on the sample numbers 21, 28, 33, 34, 25, 26 and 135

A 99% confidence interval estimate of the population mean ? can
be interpreted to mean:
a) if all possible sample are taken and confidence intervals
created, 99% of them would include the true population mean
somewhere within their interval.
b) we have 99% confidence that we have selected a sample whose
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c) we estimate that the population mean falls between the lower
and upper confidence limits, and this type of estimator is correct
99%...

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