Question

Estimate the population mean number of times that women go to Sephora each month. I spoke with 8 people and I know and found that they went out 3,2,3,4,1,2,1 and 3 times last month. Calculate a 75% confidence interval for the population mean.

Sample Mean_____

Standard Error_____

Standard Deviation_____

Lower Limit _____

Upper Limit ______

Answer #1

Think about a population mean that you may be interested in and
propose a confidence interval problem for this parameter. Your data
values should be approximately normal.
For example, you may want to estimate the population mean number
of times that adults go out for dinner each week. Your data could
be that you spoke with seven people you know and found that they
went out 1, 4, 2, 3, 2, 0, and 5 times last week. You then would...

I believe that the population mean number of times a person
bought hot coffee in a week is less than 4 per week. I spoke with
12 people and they said the number of coffees they bought per week
are as follows 5, 3, 5, 2, 1, 0, 5, 4, 4, 2, 3, and 5. Assume a 95%
confidence interval and assume a random sample.

Think about a population mean that you may be interested in and
propose a hypothesis test problem for this parameter.
For example, you may believe that the population mean number of
times that adults go out for dinner each week is less than 1.5.
Your data could be that you spoke with 7 people and found that they
went out 1, 0, 1,3, 4, 1, and 1 times last week. You then would
choose to test this hypothesis at the...

A hotel chain wants to estimate the average number of rooms
rented daily in each month. The population of rooms rented daily is
assumed to be normally distributed for each month with a standard
deviation of 24 rooms.
During January, a sample of 16 days has a sample mean of 48
rooms.
Using this information the upper limit (to two decimal places)
of a 95% cofidence interval estimate for the population mean
is?

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...

7. If I have a population of an unknown mean and unknown
standard deviation, what is the 95% confidence interval estimate of
the mean if a. A random sample of size 25 gives a mean of 50 and a
standard deviation of 12 b. A random sample of size 16 gives a mean
of 50 and a standard deviation of 12
8. The average cost per night of a hotel room in New York City
is $325. Assume this estimate...

1. I wanted to estimate the population mean number of cups of
coffee people drink in a day. I asked a group of 10 friends how
many cups of coffee they have in a day. I received the following
results: 2, 2, 3, 2, 0, 5, 1, 4, 2, 1. For my population mean, I am
choosing a 95% confidence level.
2. I decided to go with option two and go with the car theme
because I just bought a...

Construct a 95% confidence interval to estimate the population
mean using the data below.
With 95 % confidence, when nequals= 50 the population mean is
between a lower limit of _____ and an upper limit of ______

Think about a population mean that you may be interested in and
propose a hypothesis test problem for this parameter. Gather
appropriate data and post your problem and solution in the
discussion topic.
For example, you may believe that the population mean number of
times that adults go out for dinner each week is less than 1.5.
Your data could be that you spoke with 7 people and found that they
went out 2, 0, 1, 5, 0, 2, and...

Construct a 90% confidence interval to estimate the population
mean when x =62 and s =13.5 for the sample sizes below.
a)
n=20
b)
n=40
c)
n=60
a) The 90% confidence interval for the population mean when
n=20 is from a lower limit of nothing to an upper limit of nothing.
(Round to two decimal places as needed.)

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