Question

During an economic downturn, 20 companies were sampled and asked whether they were planning to increase their workforce. Only 3 of the 20 companies were planning to increase their workforce. Use the small-sample method to construct a 90% confidence interval for the proportion of companies that are planning to increase their workforce. Round the answers to at least three decimal places.

Answer #1

In a survey, people were asked whether they prefer candidate A
or candidate B. Out of 264 people, 90 said they prefer candidate
A.
Find the sample proportion and 95% confidence interval for
this statistic. (Round all answers to 2 decimal places.)
Sample proportion=
Confidence Interval= to =

138 students at a college were asked whether they had completed
their required English 101 course, and 109 students said "yes".
Construct the 90% confidence interval for the proportion of
students at the college who have completed their required English
101 course.
Enter your answers as decimals (not percents) accurate to three
decimal places.
The Confidence Interval is ( , )

140 students at a college were asked whether they had completed
their required English 101 course, and 91 students said "yes".
Construct the 99% confidence interval for the proportion of
students at the college who have completed their required English
101 course.
Enter your answers as decimals (not percents) accurate to three
decimal places.
The Confidence Interval is ( , )

140 students at a college were asked whether they had completed
their required English 101 course, and 91 students said "yes".
Construct the 99% confidence interval for the proportion of
students at the college who have completed their required English
101 course.
Enter your answers as decimals (not percents) accurate to three
decimal places.
The Confidence Interval is ( , )

. A random sample of 20 managers was taken, and
they were asked whether or not they usually take work home. The
responses of these managers are given below, where
Yes indicates they usually take work home and
No means they do not.
Yes
No
Yes Yes
Yes
No
No
Yes
No Yes
Yes
Yes Yes
Yes Yes
No
Yes Yes
No Yes
Find a point estimator for the proportion of all managers who
take work home.
Construct a 95%...

in a random poll taken in 2008, Gallup asked 1006 national
adults whether they were baseball fans. 433 of the sample said they
were. Construct a 95% confidence interval to estimate the
proportion of national adults who are baseball fans. Use 4
non-zero decimal places on calculations.
a) Find the Zα/2
b) Find σpˆ
c) Find the margin of error (MoE) and construct the confidence
interval

An Internet service provider sampled 545 customers, and finds
that 73 of them experienced an interruption in high-speed service
during the previous month. Construct a
99.5% confidence interval for the proportion of all customers
who experienced an interruption. Round the answers to at least
three decimal places.

Out of 500 people sampled, 25 had kids. Based on this, construct
a 90% confidence interval for the true population proportion of
people with kids. Give your answers as decimals, to three
places.

Out of 600 people sampled, 438 had kids. Based on this,
construct a 90% confidence interval for the true population
proportion of people with kids. Give your answers as decimals, to
three places

Out of 100 people sampled, 78 had kids. Based on this, construct
a 90% confidence interval for the true population proportion of
people with kids. As in the reading, in your calculations: --Use z
= 1.645 for a 90% confidence interval --Use z = 2 for a 95%
confidence interval --Use z = 2.576 for a 99% confidence interval.
Give your answers to three decimals Give your answers as decimals,
to three decimal places. [,]

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