Question

The scores on an examination in finance are approximately normally distributed with mean 500 and an unknown standard deviation. The following is a random sample of scores from this examination.

447, 458, 492, 519, 571, 593, 617 |

Find a 95% confidence interval for the population standard deviation. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places.

Answer #1

The scores on an examination in economics are approximately
normally distributed with mean 500 and an unknown standard
deviation. The following is a random sample of scores from this
examination.
434, 448, 502, 522, 579, 586, 635
Carry your intermediate computations to at least three decimal
places. Round your answers to at least two decimal places.Find a
90% confidence interval for the population standard deviation. Then
complete the table below.
(Upper and lower confidence interval)

The scores on an examination in economics are approximately
normally distributed with mean 500 and an unknown standard
deviation. The following is a random sample of scores from this
examination. 422, 437, 472, 502, 534 Send data to Excel Find a 90%
confidence interval for the population standard deviation. Then
complete the table below. Carry your intermediate computations to
at least three decimal places. Round your answers to at least two
decimal places. (If necessary, consult a list of formulas.)...

Suppose that scores on a particular test are normally
distributed with a mean of 110 and a standard deviation of 19 .
What is the minimum score needed to be in the top 15% of the scores
on the test? Carry your intermediate computations to at least four
decimal places, and round your answer to one decimal place.

The distribution of scores on a standardized aptitude test is
approximately normal with a mean of 500 and a standard deviation of
95 What is the minimum score needed to be in the top 20%
on this test? Carry your intermediate computations to at least
four decimal places, and round your answer to the nearest
integer.

Lifetimes of AAA batteries are approximately normally
distributed. A manufacturer wants to estimate the standard
deviation of the lifetime of the AAA batteries it produces. A
random sample of
21
AAA batteries produced by this manufacturer lasted a mean of
11
hours with a standard deviation of
1.7
hours. Find a
95%
confidence interval for the population standard deviation of the
lifetimes of AAA batteries produced by the manufacturer. Then
complete the table below.
Carry your intermediate computations to at...

Lifetimes of AAA batteries are approximately normally
distributed. A manufacturer wants to estimate the standard
deviation of the lifetime of the AAA batteries it produces. A
random sample of 28 AAA batteries produced by this manufacturer
lasted a mean of 9.1 hours with a standard deviation of 2.2 hours.
Find a 95% confidence interval for the population standard
deviation of the lifetimes of AAA batteries produced by the
manufacturer. Then complete the table below. Carry your
intermediate computations to at...

Problem Page Suppose that IQ scores in one region are normally
distributed with a standard deviation of 15 . Suppose also that
exactly 60% of the individuals from this region have IQ scores of
greater than 100 (and that 40% do not). What is the mean IQ score
for this region? Carry your intermediate computations to at least
four decimal places. Round your answer to at least one decimal
place.

Scores on the GRE(graduation record examination) are normally
distributed with a mean of 555 and a standard deviation of 135. Use
the 68-95-99.7 Rule to find the oercentage of people taking the
test who score above 690.
The percentage of people taking the test who score above 690
is ___%.

Scores on the GRE (Graduate Record Examination) are normally
distributed with a mean of 525 and a standard deviation of 98 . Use
the 68 dash 95 dash 99.7 Rule to find the percentage of people
taking the test who score above 623. The percentage of people
taking the test who score above 623 is nothing %.

Suppose that the scores on a reading ability test are normally
distributed with a mean of 60 and a standard deviation of 8. What
proportion of individuals score at least 49 points on this test?
Round your answer to at least four decimal places.

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