Question

**Question 6**

A random sample of 13 DVD movies had a mean length of 115.1 minutes, with a standard deviation of 64.7 minutes. Find the lower bound of the 90% confidence interval for the true mean length of all Hollywood movies. Assume movie lengths to be approximately normally distributed.

Round to one decimal place (for example: 108.1). Write only a number as your answer. Do not write any units.

**Question 7**

Six measurements were made of the mineral content (in percent) of spinach, with the following results. It is reasonable to assume that the population is approximately normal.

19.1, 20.1, 20.8, 21.2 , 20.5, 19.6

Find the lower bound of the 95% confidence interval for the true mineral content.

Round to three decimal places (for example: 20.015). Write only a number as your answer. Do not write any units.

**Question 8**

Following are interest rates (annual percentage rates) for a 30-year-fixed-rate mortgage from a sample of lenders in a certain city. It is reasonable to assume that the population is approximately normal.

4.327, 4.461, 4.547, 4.801 , 4.365, 4.428 , 4.842

Find the upper bound of the 99% confidence interval for the mean rate.

Round to three decimal places (for example: 4.015). Write only a number as your answer. Do not write any units.

Answer #1

A random sample of 13 DVD movies had a mean length of 114.9
minutes, with a standard deviation of 72.8 minutes. Find the lower
bound of the 90% confidence interval for the true mean length of
all Hollywood movies. Assume movie lengths to be approximately
normally distributed. Round to one decimal place.

Following are interest rates (annual percentage rates) for a
30-year-fixed-rate mortgage from a sample of lenders in a certain
cityIt is reasonable to assume that the population is approximately
normal.
4.327,4.461,4,547 4.468, 4.365 , 4.707, 4.842
Find the upper bound of the 99% confidence interval for the
mean rate.
Round to three decimal places (for example : 4.015 ). Write
only a number as your answer . Do not write any units ..

A random sample of 13 students were asked how long it took them
to complete a certain exam. The mean length of time was 117.6
minutes, with a standard deviation of 69.2 minutes. Find the lower
bound of the 90% confidence interval for the true mean length of
time it would take for all students to complete the exam. Round to
one decimal place (for example: 108.1). Write only a number as your
answer. Do not write any units.

Following are interest rates (annual percentage rates) for a
30-year-fixed-rate mortgage from a sample of lenders in a certain
city. It is reasonable to assume that the population is
approximately normal. 4.327, 4.461, 4.547, 4.621 , 4.365, 4.558 ,
4.842 Find the upper bound of the 99% confidence interval for the
mean rate.

Following Our interest rates annual percentage rates for a 30
year fixed rate mortgage from a sample of lenders in a certain
city. It is reasonable to assume that the population is
approximately normal. 4.327, 4.461, 4.547, 4.695, 4.365, 4.669,
4.842 Find the upper bound of the 99% confidence interval for the
mean rate Round to three decimal places.

Six
measurements were made of the mineral content (in percent) of
spinach, with the following results. It is reasonable to assume
that the population is approximately normal
19.1, 20.1, 20.8, 20.5, 20.5, 19.5
Find the lower bound of the 95% confidence interval for the
true mineral content.
Round to three decimal places (for example: 20.015)Write only
a number as your answer . Do not write any units.

A random sample of 43 Foreign Language movies made since 2000
had a mean length of 130.1 minutes, with a standard deviation of
12.1 minutes.
A)Construct a
98% confidence interval for the true mean length of
all Foreign Language movies made since 2000. Round the answers to
one decimal place. A 98% confidence interval for the true meaning
length of all Foreign language movies made since 2000 is
B) As of november 2013, three spider man movies have been
released, and...

A simple random sample of 12 e-readers of a certain type had the
following minutes of battery life. 287, 311, 262, 392, 313, 347,
274, 316, 286, 341, 347, 291 Assume that it is reasonable to
believe that the population is approximately normal and the
population standard deviation is 70. What is the upper bound of the
95% confidence interval for the battery life for all e-readers of
this type? Round your answer to one decimal places (for example:
319.4)....

A simple random sample of 12 e-readers of a certain type had the
following minutes of battery life. 287, 311, 262, 392, 313, 309,
294, 316, 286, 346, 335, 291 Assume that it is reasonable to
believe that the population is approximately normal and the
population standard deviation is 75. What is the upper bound of the
95% confidence interval for the battery life for all e-readers of
this type? Round your answer to one decimal places (for example:
319.4)....

*Please Answer All *
1. A company has developed a new type of light bulb and wants to
estimate its mean lifetime. A simple random sample of 12 bulbs had
a sample mean lifetime of 651 hours with a sample standard
deviation of 31 hours. It is reasonable to believe that the
population is approximately normal. Find the lower bound of the 95%
confidence interval for the population mean lifetime of all bulbs
manufactured by this new process. Round to...

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