Statistics- A study is done of accidents comparing two cities by sampling

QUESTION

1. Which of the following are
dependent samples:
(a)
older siblings; younger siblings (matched pairs of siblings )
(b)
before; after
(c)
sample from FA; sample from FB ( both randomly chosen)
(d)
age of patients: older sample; younger
sample (both selected at random)

2. Which of the above are
independent samples:

3. A study is done of accidents comparing
two cities by sampling and finding the mean number of accidents per day. State the Null Hypothesis.

4. Calculate the standard error
if two samples sizes n1=25, n2=19, and standard
deviations of the samples were s1= 3.1, s2=4.2.

5. Calculate the correct test
statistic for the following scenarios:
a)
.0/msohtmlclip1/01/clip_image002.png”>
b) .0/msohtmlclip1/01/clip_image004.png”>
c) .0/msohtmlclip1/01/clip_image006.png”>

6. Find the critical values for
the F distribution for the following:
a) .0/msohtmlclip1/01/clip_image008.png”>
b) .0/msohtmlclip1/01/clip_image010.png”>
c) .0/msohtmlclip1/01/clip_image012.png”>

7. A pretest was given a group of
students. Then they were given the opportunity to study an intensely
interesting course in statistics. Then
they were given a post test. Their Marks were as follows:

Fred

Wilma

Hi

Lois

Bert

Ernie

Mikey

Samantha

Pre
test

10

48

1

50

11

1

15

36

Post
test

02

01

11

81

64

79

16

36

Test the Conjecture that the Post test marks were
higher than the pretest marks at a level of significance 0.05.
Organize
your work according to the steps outlined in The Procedure for Hypothesis
Testing. Marks will be given for each step.

8. For the Post test marks in question 7, use the
sign test to test the claim that the median is 65.

ANSWER:

REQUEST HELP FROM A TUTOR