1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alina [70]
3 years ago
7

The height (in inches) of adult men in the United States is believed to be Normally distributed with mean μ . The average height

of a random sample of 25 American adult men is found to be ¯ x = 69.72 inches, and the standard deviation of the 25 heights is found to be s = 4.15 . A 90% confidence interval for μ is: a. 69.72 ± 1.37 b. 69.72 ± 1.42 c. 69.72 ± 1.09
Mathematics
1 answer:
Jlenok [28]3 years ago
5 0

Answer: a. 69.72 ± 1.37

Step-by-step explanation:

We want to determine a 90% confidence interval for the mean height (in inches) of adult men in the United States.

Number of sample, n = 25

Mean, u = 69.72 inches

Standard deviation, s = 4.15

For a confidence level of 90%, the corresponding z value is 1.645. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean ± z × standard deviation/√n

It becomes

69.72 ± 1.645 × 4.15/√25

= 69.72 ± 1.645 × 0.83

= 69.72 ± 1.37

The lower end of the confidence interval is 69.72 - 1.37 = 68.35

The upper end of the confidence interval is 69.72 + 1.37 = 71.09

You might be interested in
D(5,7), E4, 3), and 18, 2) form the vertices of a triangle. What is m_DEF?
dolphi86 [110]

Answer:

D.90°

explanation:

I hope it help

5 0
2 years ago
Blank plus 2/3 equals 11/12
BaLLatris [955]
Your answer would be 3/12
4 0
3 years ago
Pam spelled 68 of 100 words correctly on the pretest how Many words dos the Miss? If she learns 8 of those each day how long wil
solmaris [256]
It would take 4 days
5 0
3 years ago
A recipe for oatmeal raisin cookies call for 1 2/3 cups of flour to make 4 dozen cookies. How many cups of flour are needed to m
kicyunya [14]
It would take about 2 1/2 to make six dozens
7 0
3 years ago
Isabelle went hiking. She climbed part way up a mountain and stopped to have lunch. Then, she climbed to the top. She took sever
Maru [420]

please post the graph and repost the question

5 0
3 years ago
Other questions:
  • when 20 is added to 7 times the number x, the result is -1. What number results when 2 times x is subtracted from 5?
    5·2 answers
  • Simplify fully 13/2x - 5/x
    9·2 answers
  • A ladder is resting against a wall. The ladder and the ground make an angle of 45° and the ladder is 7 ft from the wall. How lon
    8·1 answer
  • How do you write two hundred and three thousandths in number form
    12·1 answer
  • Every day Abby's teacher picks a number of the day from 1 to 20. The number of the day can be repeated. There are 180 days in th
    15·1 answer
  • Multiply for the following polynomial (y-8) (y+5) with the work included.
    6·1 answer
  • Sarah has made 30dresses, and she plans to make 3more dresses per month. Her sister , Anna has 40dresses and is planning on givi
    9·1 answer
  • Do you think we would have had a civil war to end slavery if we had not expanded west and taken territory from Mexico? Thinking
    5·1 answer
  • Proof that an invertible function f can have only one inverse
    8·1 answer
  • Which term is not possible in the domain of a sequence?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!