Log in
Statistics
2
answers
1
watching
343
views

You want to estimate the mean number of friends for all Facebook users. How many users must be in the sample if you want to be 95% confident that the sample mean is within seven friends of the population mean? Assume the standard deviation is 53.

Watch
2
answers
1
watching
343
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
Priyanshu Patel
Priyanshu PatelLv10
19 Apr 2021
Already have an account? Log in
Share

Related textbook solutions

Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208

Related questions

a simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is  15.

  1. Compute the 95% confidence interval for the population mean.

  2. Assume that the same sample mean was obtained from a sample of 120 items. Provide

    a 95% confidence interval for the population mean.

  3. What is the effect of a larger sample size on the interval estimate?

How do you construct a 95% confidence interval?
You work for a consumer advocate agency and want to find the mean repair cost of a washing machine. As part of your study, you randomly select 40 repair costs and find the mean to be $100. The sample standard deviation if $17.50. How do you construct a 95% confidence interval for the population mean repair cost?

The ages of a group of

125

randomly selected adult females have a standard deviation of

16.2

years. Assume that the ages of female statistics students have less variation than ages of females in the general​ population, so let

sigmaequals16.2

years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics​ students? Assume that we want

95​%

confidence that the sample mean is within​ one-half year of the population mean. Does it seem reasonable to assume that the ages of female statistics students have less variation than ages of females in the general​ population?

Weekly leaderboard

Home
Homework Help 3,900,000
Statistics 10,000
Start filling in the gaps now
Log in