Question

In a certain population, body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds. How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? assume that we want 96% confidence that the error is no more than 2.5 percentage points

Answer #1

In a certain population, body weights are normally distributed
with a mean of 152 pounds and a standard deviation of 26 pounds.
How many people must be surveyed if we want to estimate the
percentage who weigh more than 180 pounds? Assume that we want 96%
confidence that the error is no more than 4 percentage points.

4. Find the margin of error E. In a random sample of 151 college
students, 84 had part-time jobs. Find the margin of error E for the
95% confidence interval used to estimate the population proportion.
Round your answer to four decimal places. Answer 0.0792
5. Find the minimum sample size required to estimate the
population proportion p: Margin of error: 0.10; confidence level:
95%; from a prior study, is known to be 66%.
6. Find the minimum sample size...

The weights of male basketball players on a certain college are
normally distributed with a mean of 180 pounds and a standard
deviation of 26 pounds. If a player is selected at random, find the
probability that:
a. The player will weigh more than 225 pounds
b. The player will weigh less than 225 pounds
c. The player will weigh between 180 and 225 pounds

The weights of a certain dog breed are approximately normally
distributed with a mean of 53 pounds, and a standard deviation of
5.9 pounds. Answer the following questions. Write your answers in
percent form. Round your answers to the nearest tenth of a
percent.
a) Find the percentage of dogs of this breed that weigh less than
53 pounds. %
b) Find the percentage of dogs of this breed that weigh less than
49 pounds. %
c) Find the percentage...

The weights of a certain dog breed are approximately normally
distributed with a mean of 50 pounds, and a standard deviation of
6.6 pounds. Use your graphing calculator to answer the following
questions. Write your answers in percent form. Round your answers
to the nearest tenth of a percent.
a) Find the percentage of dogs of this breed that weigh less
than 50 pounds. ______ %
b) Find the percentage of dogs of this breed that weigh less
than 47...

The weights of northern koala bears are normally distributed
with a mean of 14.3 pounds and a standard deviation of 2.8
pounds.
Find the percentage of northern koala bears that weigh between
16.4 and 17.1 pounds.
a. Round your response to one decimal place in percentage form
and give your answer in a full sentence.
b. Is it unusual for a northern koala bear to weigh 16.4 to 17.1
pounds. Explain and support your response in a full sentence.
c....

The weights of adult male beagles are normally distributed with
a mean, ? = 25 pounds and a standard deviation, ? = 3 pounds.
a. Use the empirical rule to find the percentage of beagles that
weigh between 22 and 28 pounds. %
b. Use the empirical rule to find the percentage of beagles that
weigh between 19 and 31 pounds

The weights for newborn babies is approximately normally
distributed with a mean of 6 pounds and a standard deviation of 1.7
pounds. Consider a group of 900 newborn babies: 1. How many would
you expect to weigh between 5 and 9 pounds? 2. How many would you
expect to weigh less than 8 pounds? 3. How many would you expect to
weigh more than 7 pounds? 4. How many would you expect to weigh
between 6 and 10 pounds?

The weights for newborn babies is approximately normally
distributed with a mean of 5.4 pounds and a standard deviation of
1.6 pounds.
Consider a group of 1100 newborn babies:
1. How many would you expect to weigh between 3 and 8 pounds?
2. How many would you expect to weigh less than 7 pounds?
3. How many would you expect to weigh more than 6 pounds?
4. How many would you expect to weigh between 5.4 and 9
pounds?
HINT:...

Assume that the weights of spawning Chinook salmon in the
Columbia river are normally distributed. You randomly catch and
weigh 26 such salmon. The mean weight from your sample is 31.2
pounds with a standard deviation of 4.6 pounds. You want to
construct a 90% confidence interval for the mean weight of all
spawning Chinook salmon in the Columbia River. (a) What is the
point estimate for the mean weight of all spawning Chinook salmon
in the Columbia River? pounds...

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