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

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.3: Special Probability Density Functions
Problem 7E
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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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ISBN:
9780321964038
Author:
GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:
Pearson Addison Wesley,