Suppose x has a normal distribution with o = 1. A random sample of size 18 has a sample mean of x = 50.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 26PFA
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Please help me asnwer both questions!

Suppose x has a normal distribution with o = 1. A random sample of size 18 has a sample mean of x = 50.
(a) What conditions are necessary for your calculations? (Select all that apply.)
|normal distribution of x
O nis large
O uniform distribution of x
O c is unknown
o is known
(b) Find a 90% confidence interval for mu. What is the margin of error? (Round your answers to two decimal places.)
lower limit
upper limit
margin of error
Transcribed Image Text:Suppose x has a normal distribution with o = 1. A random sample of size 18 has a sample mean of x = 50. (a) What conditions are necessary for your calculations? (Select all that apply.) |normal distribution of x O nis large O uniform distribution of x O c is unknown o is known (b) Find a 90% confidence interval for mu. What is the margin of error? (Round your answers to two decimal places.) lower limit upper limit margin of error
Suppose x has a normal distribution with o = 11. A random sample of size 35 has a sample mean of x = 70.
(a) What conditions are necessary for your calculations? (Select all that apply.)
O uniform distribution of x
O cis unknown
O n is large
O normal distribution of x
O a is known
(b) Find a 95% confidence interval for mu. What is the margin of error? (Round your answers to two decimal places.)
lower limit
upper limit
margin of error
Transcribed Image Text:Suppose x has a normal distribution with o = 11. A random sample of size 35 has a sample mean of x = 70. (a) What conditions are necessary for your calculations? (Select all that apply.) O uniform distribution of x O cis unknown O n is large O normal distribution of x O a is known (b) Find a 95% confidence interval for mu. What is the margin of error? (Round your answers to two decimal places.) lower limit upper limit margin of error
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