Question

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 a semester is greater than
$270?

Answer #1

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...

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
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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...

The distribution of the amount of money spent by students on
textbooks in a semester is approximately normal in shape with a
mean of 434 and a standard deviation of 31. According to the
standard deviation rule, approximately 99.7% of the students spent
between ____$ and ______$ on textbooks in a semester.
Question 12
Type numbers in the boxes.
1 points
The distribution of IQ (Intelligence Quotient) is approximately
normal in shape with a mean of 100 and a standard...

Assume that you are trying to estimate the expenditure on books
which is normally distributed for AUS students for this semester.
To get that estimate, you sample 25 students and find that AUS
students spend an average of 1000 AED on books in this sample. If
the standard deviation of expenditure is 600 AED,
Estimate with 90% confidence the average book expenditure.
How many students you need to get in order to be within 30 AED
from the mean, with...

Let X, the amount of money a student at a university
spent on rent in April 2013, be normally distributed with mean $500
and standard deviation $100. Then, there is a 95% probability that
a randomly selected student spent between 500 − (1.96 × 100) = 304
and 500 + (1.96 × 100) = 696 dollars on rent in April 2013.
Check if this is correct: Here, X is normally
distributed with μ = 500, σ = 100.

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:

Suppose that the amount of money spent per week on groceries is
normally distributed with an unknown mean and standard deviation. A
random sample of 20 grocery bills is taken and gives a sample mean
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Use a calculator to find a 95% confidence interval estimate for
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Round your answer to two decimal places

The weekly amount of money spent on cleaning, maintenance, and
repairs at a large restaurant was observed over a long period of
time to be approximately normally distributed with mean ? = $615
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week, what s the probability that the actual costs will exceed the
budgeted amount? b. How much should be budgeted for weekly repairs,
cleaning, and maintenance so that the probability the budgeted
amount will...

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