Question

Suppose we would like to estimate the mean amount of money (μ) spent on clothing by female McGill students in the last month. A random sample of 14 university women spending is: {200,200,100,100,200,200, 250,150,80,80,20,50,100,350}. Assume that the amount spent on cloths is normally distributed. Compute 95% and 99% confidence interval for μ.

4- Following exercise 3 we asked a random sample of 19 university men to estimate how much they spent on clothing in the last month. The data is {175,150,100,100,200,200,200,100,0,200,80,100,120,80, 25,50,100,30,60}. Test the hypothesis that the population mean-amounts spent on clothes are different for men and women. Use a significant level of 0.05 and 0.01. Assume that the distributions of amount spending are approximately Normal.

Answer #1

Suppose you would like to estimate the mean amount of money (μ)
spent on books by
students in a semester. You have the following data from 41
randomly selected
students: = $264 and s = $42. Assume that the amount spent on books
by
students is normally distributed.
a) (10 points) Compute a 80% confidence interval.
b) (10 points) Is there evidence at a 10% level of significance
that the mean amount of
money spent on books by students in...

1. Suppose you would like to estimate the mean amount of money
(μ) spent on books by CSIS students in a semester. You have the
following data from 20 randomly selected CSIS students: X = $264
and s = $40. Assume that the amount spent on books by CSIS students
is normally distributed.
a) Compute a 80% confidence interval.
b) Is there evidence at a 10% level of significance that the
mean amount of money spent on books by CSIS...

1. We would like to estimate the mean amount of money spent on
books by students in a year. Assuming the amount spent on books by
students is normally distributed, we have the following data from
40 randomly selected students: N ($249, $30). Using a 95%
confidence interval, the true mean of money spent on books by
students in a year is between what two amounts?
2. Suppose we know that the birth weight of babies is Normally
distributed with...

It is calculated that, in order to estimate the true mean amount
of money spent by all customers at a grocery store to within $3
with 90% confidence, we require a sample of 180 customers. What
sample size would be required to estimate the true mean to within
$1 with 90% confidence? Your Answer:

12. In order to estimate the mean amount of time computer users
spend on the internet each month, how many computer users must be
surveyed in order to be 90% confident that your sample mean is
within 15 minutes of the population mean? Assume that the standard
deviation of the population of monthly time spent on the internet
is 211 min. What is a major obstacle to getting a good estimate of
the population mean? Use technology to find the...

One local hockey team conducts a study to compare the amount of
money spent on refreshments at the Bell Centre. Two simple random
samples of 100 men and 100 women are collected. For men, the
average expenditure was $20, with a known population standard
deviation of $5. For women, it was $30, with a known population
standard deviation of $4.
a) Estimate the difference in the expenditure between man and
women using a 99% confidence interval.
b) Based on your...

A researcher was interested in comparing the amount of time
spent watching television by women and by men. Independent simple
random samples of 14 women and 17 men were selected, and each
person was asked how many hours he or she had watched television
during the previous week.
The summary statistics are as follows:
Women Men
_
Sample mean 11.9
hrs 16.9 hrs
Sample SD 4.1
hrs 4.8 hrs
Sample
size
14
17
Use this data and a 0.05 significance...

One local hockey team conducts a study to compare the amount of
money spent on refreshments at the Bell Centre. Two simple random
samples of 100 men and 100 women are collected. For men, the
average expenditure was $20, with a known population standard
deviation of $5. For women, it was $30, with a known population
standard deviation of $4.
a) Estimate the difference in the expenditure between man and
women using a 99% confidence interval.
b) Based on your...

A researcher was interested in comparing the amount of time
spent watching television
by women and by men. Independent simple random samples of 14 women
and 17 men
were selected, and each person was asked how many hours he or she
had watched
television during the previous week. The summary statistics are as
follows:
Women Men .
Sample
Mean 12.9 16.4
Sample
SD 4.0 4.2
Sample
Size 14 17
This sample data is then used to test the claim that the mean time
spent watching
television by women...

A survey was conducted to estimate the mean number of books
(denoted by μ) each university student read in the last year. Among
a random sample of 61 students, the number of books each student
read in the last year was recorded. The sample mean was 7.098 and
the sample standard deviation was 2.644.
Write down the point estimate of μ. (5 points)
Calculate the standard error of the point estimate in a. (10
points)
To construct a 95% two-sided...

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