Turn on thread page Beta
 You are Here: Home >< Maths

# Help?! Stats test tomorrow and very confused watch

1. Hi!

I have a statistics exam tomorrow and am having trouble with one of the questions on the study guide...I've been working on it all day to little avail and would really appreciate some guidance with it.

2. Dutch male adolescents have a mean height of 72 inches with a standard deviation of 3 inches. For this problem, use fractions and approximating instead of calculators. Using round ﬁgures will make your life easier and show quantities more neatly.
(a) Draw a carefully labeled diagram of the population distribution.
(b) Find and interpret the ﬁrst quartile of this distribution; what does the ﬁrst quartile tell us?
(c) For a sample size of n=5 (assumep(5) = 9 4, draw a carefully labeled diagram of the sampling distribution for the mean height, ¯ x.
(d) Find and interpret the ﬁrst quartile of this distribution; what does the ﬁrst quartile tell us? (e) Estimate the standard error of the sampling distribution for ¯ x from the following data on Dutch heights: 76,68,73,71,72. Assume√8.5 = 3. Is it approximately : 3, 1.5, 4 3, .75 or 3 16?
(f) Assume the population mean µ = 72. Find the ﬁrst quartile of the distribution in part
(e) and explain the diﬀerence, if any, between this and the ﬁrst quartiles in the previous two distributions.

I've got (a) and (b), but I'm really struggling with (c). Any advice?
2. (Original post by who1963)
Hi!

I have a statistics exam tomorrow and am having trouble with one of the questions on the study guide...I've been working on it all day to little avail and would really appreciate some guidance with it.

2. Dutch male adolescents have a mean height of 72 inches with a standard deviation of 3 inches. For this problem, use fractions and approximating instead of calculators. Using round ﬁgures will make your life easier and show quantities more neatly.
(a) Draw a carefully labeled diagram of the population distribution.
(b) Find and interpret the ﬁrst quartile of this distribution; what does the ﬁrst quartile tell us?
(c) For a sample size of n=5 (assumep(5) = 9 4, draw a carefully labeled diagram of the sampling distribution for the mean height, ¯ x.
(d) Find and interpret the ﬁrst quartile of this distribution; what does the ﬁrst quartile tell us? (e) Estimate the standard error of the sampling distribution for ¯ x from the following data on Dutch heights: 76,68,73,71,72. Assume√8.5 = 3. Is it approximately : 3, 1.5, 4 3, .75 or 3 16?
(f) Assume the population mean µ = 72. Find the ﬁrst quartile of the distribution in part
(e) and explain the diﬀerence, if any, between this and the ﬁrst quartiles in the previous two distributions.

I've got (a) and (b), but I'm really struggling with (c). Any advice?
I'm a bit confused - what is p(5) = 9 4?

Reply
Submit reply
Turn on thread page Beta

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 30, 2017
Today on TSR

### Predict your A-level results

How do you think you'll do?

### University open days

1. University of Bradford
University-wide Postgraduate
Wed, 25 Jul '18
2. University of Buckingham
Psychology Taster Tutorial Undergraduate
Wed, 25 Jul '18
3. Bournemouth University
Clearing Campus Visit Undergraduate
Wed, 1 Aug '18
Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.