STATISTICS WEEK 4 ASSIGNMENT

QUESTION 1

1. Randomly selected 50 people from New York City were asked
if they use a subway to get to the work place. 40 said "Yes".
Based on this sample data was made a statement that 80%
of the whole population of New York City take subway to get to the work place.
Does this statement represent descriptive or inferential statistics?

		descriptive
		inferential

1 points

QUESTION 2

1. Table below shows example of frequency and relative-frequency distribution.

Interval	Frequency	Relative frequency
22-29	4	0.16
30-39	6	0.24
40-49	?	0.40
50-59	5	0.20
Total		1.00

2.
Find missing frequency for interval 40-49.

		8
		10
		12
		15

1 points

QUESTION 3

1. A sample of democratic voters were asked if they voted
in the primary election for Hillary (H), Sanders (S) or none above (N).
Here is the result of this poll:

H H S S S N N N H N
S H S S N H N H N N
S S S N N N H N N N
N H S S S N N N N N

Based on this sample, what is the relative frequency
for number of likely democratic voters who will not
participate in the coming election?

		0.28
		0.10
		0.50
		0.35

1 points

QUESTION 4

1. Find the Median for the following set of data:

11, 22, 5, 7, 30

		5
		11
		6
		15

1 points

QUESTION 5

1. Find the Median for the following set of data:

25, 20, 8, 10, 28, 16, 22, 15

		22
		19
		18
		25

1 points

QUESTION 6

1. Calculate Weighted Mean for the following Data:

Value	Weight
20	2
25	4
32	4
40	2
		29
		28
		26
		30

1 points

QUESTION 7

1. What data collection represents this Steam-and-Leaf Diagram?

Stems	Leaves
2	1, 4
3	2, 5
4	0, 3
5	6, 8

2.

		1, 4, 2, 5, 0, 3, 6, 8
		2, 1, 4, 3, 2, 5, 4, 0, 3, 5, 6, 8
		12, 42, 23, 53, 04, 34, 65, 85
		21, 24, 32, 35, 40, 43, 56, 58

1 points

QUESTION 8

1. Based on this Histogram, what percentage of data are below 41?

If you don't see a Histogram,click here

		40%
		50%
		65%
		75%

1 points

QUESTION 9

1. Calculatesample variance for the following data collection:
10, 25, 28, 35
(when you calculate variance, divide by N-1 not by N).

		85
		111
		150
		180

1 points

QUESTION 10

1. Calculatesample standard deviation for the following data collection:

22, 24, 28, 31, 35

(use formula for sample, not for population:
when you calculate variance divide by N-1 not by N).

		5.2
		6.4
		7.1
		8.0