Question

(If creating a confidence interval involving proportions, always use the Plus Four Method. Use 5% significance level for all tests and 95% confidence level for all confidence intervals.)

You want to estimate the difference in the percent of women who get manicures and the percent of men. You take SRSs of 50 men and 50 women and find that 37 of the women get manicures at least once a month, while 12 of the men get manicures at least once a month.

Answer #1

We have covered various tests and confidence intervals
and many of these are listed below. Read the following short
scenarios and pick the test or confidence interval that best meets
the objective. Choose only one and write the number in the space
provided below the question.
1. Confidence interval for a proportion.
2. Confidence interval for a mean
3. Test for a population Proportion
4. Test for comparing Proportions between 2 groups.
5. Test for comparing Proportions between c groups....

1. When constructing a confidence interval to estimate a
population proportion, what affects the size of the margin of
error?
A. The sample size
B. The sample proportion
C. The confidence level
D. All of the above affect the size of the margin of error
E. None of the above affect the size of the margin of error
2. What percentage of couples meet through online dating
apps? A survey of a random sample of couples finds that 12% say...

Part 1: z-Procedures In this part, we will use z-procedures.
z-procedures are both confidence intervals and hypothesis tests
that use a Normal distribution. They are called z-procedures
because they rely on a z-test statistic and/or a z-critical value.
So far, we can use z-procedures for a population mean knowing the
population standard deviation. In Part 1, you will use the data
file TempSample00-18.
(THIS IS DATA) YEAR,Month,High Temperature
2000,Jan,45
2000,Jan,48
2001,Jan,49
2003,Jan,62
2003,Jan,53
2004,Jan,42
2004,Jan,47
2005,Jan,40
2005,Jan,47
2006,Jan,48
2006,Jan,47
2007,Jan,51...

Problem #1 Confidence Interval for Means using the t and
z Distribution. Psychologists studied
the percent tip at a restaurant when a message indicating that the
next day’s weather would be nice was written on the bill. Here are
tips from a random sample of patrons who received such a bill,
measured in percent of the total bill:
20.8 18.7
19.9 20.6
21.9 23.4
22.8 24.9
22.2 20.3
24.9 22.3
27.0 20.4
22.2 24.0
21.1 22.1
22.0 22.7
Open an...

This quiz relates to Section 8.1 - Confidence Intervals
for a Population Proportion. The indicated problems relate to
exercises found on pp. 501-503 in the main textbook
(IPS).
You will have two attempts at this quiz. I suggest you
do all of them first on paper. After the first attempt, you should
write down which ones you answered correctly and which one
incorrectly, as well as any hints that were given. Then re-solve
the problems and take the quiz a...

Everyday investment company Sharesies was launched in February
2017, after conducting research on New Zealanders’ attitudes
towards investing. Prior to launching the company, the co-founders
interviewed over 200 people asking them “If I gave you $50 right
now, and you had to do something with it in the next 5 minutes what
would you do?” Only 5 out of 200 people chose an option to save or
invest the $50. More popular options were bills, online shopping,
coffees, vouchers, food,...

Write a Python 3 program called “parse.py” using the
template for a Python program that we covered in this module.
Note: Use this mod7.txt input file.
Name your output file “output.txt”.
Build your program using a main function and at least
one other function.
Give your input and output file names as command line
arguments.
Your program will read the input file, and will output
the following information to the output file as well as printing it
to the screen:...

Everyday investment company Sharesies was launched in February
2017, after conducting research on New Zealanders’ attitudes
towards investing. Prior to launching the company, the co-founders
interviewed over 200 people asking them “If I gave you $50 right
now, and you had to do something with it in the next 5 minutes what
would you do?” Only 5 out of 200 people chose an option to save or
invest the $50. More popular options were bills, online shopping,
coffees, vouchers, food,...

CASE: Sharesies: NZ investment platform
Everyday investment company Sharesies was launched in February
2017, after conducting research on New Zealanders’ attitudes
towards investing. Prior to launching the company, the co-founders
interviewed over 200 people asking them “If I gave you $50
right now, and you had to do something with it in the next 5
minutes what would you do?” Only 5 out of 200 people chose an
option to save or invest the $50. More popular options were bills,...

1. A city official claims that the proportion of all commuters
who are in favor of an expanded public transportation system is
50%. A newspaper conducts a survey to determine whether this
proportion is different from 50%. Out of 225 randomly chosen
commuters, the survey finds that 90 of them reply yes when asked if
they support an expanded public transportation system. Test the
official’s claim at α = 0.05.
2. A survey of 225 randomly chosen commuters are asked...

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