Question

1)Construct a 95% confidence interval estimate for the population mean given that s =30 , and n = 20.

2) A random sample of 81 workers at a company showed that they work an average of 100 hours per month with a standard deviation of 27 hours. At 95% confidence, how many more workers need to be included in the sample to provide a confidence interval with length 4 (i.e., the margin of error being 2)?

Answer #1

Assume that you want to construct a 95% confidence interval
estimate of a population mean. Find an estimate of the sample size
needed to obtain the specified margin of error for the 95%
confidence interval. The sample standard deviation is given
below.
Margin of errors=$6,
standard deviation=$22
The required sample size is __

Find the margin of error for the 95% confidence interval used to
estimate the population proportion.
12) In clinical test with 2349 subjects. 1232 showed
improvement from the treatment
Use the given degree of confidence and sample data to
construct a confidence interval for the population proportion
p
13) n=101,x=73;88 percent

Assume that you want to construct a 95% confidence interval
estimate of a population mean. Find an estimate of the sample size
needed to obtain the specified margin of error for the 95%
confidence interval. The sample standard deviation is give. E= 20.3
cm, sample standard deviation =321.0 cm.
1201
961
916
Cannot tell from the given information

Construct a 95% confidence interval for the population
mean,Assume the population has a normal distribution, A random
sample of 16 fluorescent light bulbs has a mean life of 645 hours
with a standard devastion of 31 hours.
From the above question calculate the 99% confidence interval
for n = 16.
then, Letting n= 100, calculate the 95% and 99% confidence
intervals
(a) What happend to the interval width from 95% to 99%
(b) what happend to the interval width from...

You want to construct a 95% confidence interval to estimate an
unknown population proportion with a margin of error of ±2%. What
is the minimum necessary sample size that you should obtain?

if n=100 and X=30, construct a 95% confidence interval
estimate for the population proportion.

Construct a 95% confidence interval to estimate the population
mean when x=122 and s =28 for the sample sizes below.
a) n=30 b) n=70 c) n=90
a) The 95% confidence interval for the population mean when
n=30 is from a lower limit of to an upper limit of. (Round to two
decimal places as needed.)
b) The 95% confidence interval for the population mean when
n=70 is from a lower limit of to an upper limit of . (Round to...

1.)If n=400 and X=100, construct a 95% confidence interval
estimate of the population proportion.
≤π≤ (ROUND 4 DECIMAL PLACES)
2.) 19A telecommunications company wants to estimate the
proportion of households that would purchase an additional
telephone line if it were made available at a substantially reduced
installation cost. Data are collected from a random sample of 500
households. The results indicate that 120 of the households would
purchase the additional telephone line at a reduced installation
cost.
a. Construct a...

1) Construct a 95% confidence interval to estimate the
population proportion using the data below.
x = 24
n= 75
N= 500
2) A university would like to estimate the proportion of fans
who purchase concessions at the first basketball game of the
season. The basketball facility has a capacity of
3,500 and is routinely sold out. It was discovered that a total
of 200 fans out of a random sample of 400 purchased concessions
during the game. Construct a...

Determine the margin of error for
a
95%
confidence interval to estimate the population mean when s
=
37
for the sample sizes below.
a)
nequals=15
b)
nequals=34
c)
nequals=46
a) The margin of error for
a
95%
confidence interval when
nequals=15
is
nothing.
(Round to two decimal places as needed.)
b) The margin of error for
a
95%
confidence interval when
nequals=34
is
nothing.
(Round to two decimal places as needed.)
c) The margin of error for
a
95%...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 6 minutes ago

asked 34 minutes ago

asked 41 minutes ago

asked 55 minutes ago

asked 55 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago