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Question: The heights of young adult females in the United States are said to have a population standard de…

by | Nov 30, 2023 | Posted Questions


The heights of young adult females in the United States are
said to have a population standard deviation of Question: The heights of young adult females in the United States aresaid to have a population standard de...
= 2.6 inches. A sample was taken of Question: The heights of young adult females in the United States aresaid to have a population standard de... = 85
young adult females at school and the mean computed to be Question: The heights of young adult females in the United States aresaid to have a population standard de...
= 65.4 inches.
What is the point estimate for the population mean? Round your
answer to 1 decimal place.
What is the margin of error for a 95% confidence interval of
the population mean? Round your answer to 3 decimal places.
Compute the 95% confidence interval of the mean height. Round
your answers to 3 decimal places and use interval notation.
[Example: (42.335, 54.859)]
(  ,  )
Which of the following explanations describes the correct way
to interpret the 95% confidence interval for this problem? (May be
more than one correct answer)
There is a 95% chance that the true mean height of adult
females in the United States is in our confidence interval.
We are 95% confident that the true mean height of adult females
in the United States is somewhere in our confidence interval.
Approximately 95% of all 95% confidence intervals that could be
computed from the population of all adult females in the United
States will contain the true mean height.
95% of all of the heights of female adults in the US are in our
confidence interval.
95% of the heights of female adults in our sample are in our
confidence interval.
Suppose you were also asked to calculate a 90% confidence
interval. What would change from the 95% confidence interval you
calculated in question 3?
The 90% confidence interval would be wider.
The 90% confidence interval would be narrower.
No change.

What is the margin of error for a 90% confidence interval of the
population mean? Round your answer to 3 decimal places.

Suppose that instead of a sample of Question: The heights of young adult females in the United States aresaid to have a population standard de... = 85
you used a sample of Question: The heights of young adult females in the United States aresaid to have a population standard de... =
35. What would change from the 95% confidence interval you
calculated in question 3?
The new confidence interval would be wider.
The new confidence interval would be narrower.
No change. All 95% confidence intervals are the same
width.
Suppose a new study is being planned. What sample size would be
required to obtain a 95% confidence interval with a margin of error
of 0.25 inches? Round your answer up to the nearest whole number.
(Example: If you get 101.2 round to 102)
Question: The heights of young adult females in the United States aresaid to have a population standard de...
=

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