Log in
Economics
1
answer
0
watching
147
views

Suppose X has a normal distribution with mean 10 and standard deviation 2. In order for the Z-score to be equal to 0, then X must be equal to?

Watch
1
answer
0
watching
147
views

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

Alice Sejake
Alice SejakeLv10
5 Mar 2021

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Principles of Economics
2nd Edition, 2017
Openstax
ISBN: 9781947172364
Principles of Macroeconomics
2 Edition,
Openstax
ISBN: 9781947172388
Principles of Microeconomics
2 Edition,
Openstax
ISBN: 9781947172340

Related questions

a. Suppose X is a normal random variable with mean 2 and standard deviation 10. Find P(X < -5),

P(X >= 0), and P(X >= 10).

b. Suppose that X is a normal random variable with mean 100 and standard deviation 6. Find P(X <= 110), P(X >= 85), and P(X <= 100).

c. Suppose that X is a normal random variable with mean 30 and standard deviation 2. Find P(X >= 28), P(27 <= X <= 34), and P(X <= 35).

(15.28) Almost all medical schools in the United States require students to take the Medical College Admission Test (MCAT). To estimate the mean score μμ of those who took the MCAT on your campus, you will obtain the scores of an SRS of students. The scores follow a Normal distribution, and from published information you know that the standard deviation is 6.4. Suppose that (unknown to you) the mean score of those taking the MCAT on your campus is 24.

In answering the following, use z-scores rounded to two decimal places.

If you choose one student at random, what is the probability (±±0.0001) that the student's score is between 20 and 30?

You sample 22 students. What is the standard deviation (±±0.01) of the sampling distribution of their average score x¯¯¯x¯?

What is the probability (±±0.0001) that the mean score of your sample is between 20 and 30?

4. A research firm conducted a survey to determine the mean amount of steady smokers spend on cigarettes during the week. They found the distribution of amounts spent per week followed a normal distribution with a population standard deviation of $5. A sample of 64 smokers revealed a sample mean of $20.

A) Construct a 95% and 99% confidence interval for the population mean.

B) Would it be reasonable to conclude that the population mean is $22?

Weekly leaderboard

Home
Homework Help 3,900,000
Economics 400,000
Start filling in the gaps now
Log in