Question

question 1:

The following data give the time (in minutes) that each of 20 students waited in line at their bookstore to pay for their textbooks in the beginning of Spring 2012 semester.

14 | 35 | 23 | 23 | 12 |

46 | 41 | 51 | 22 | 37 |

22 | 34 | 14 | 46 | 32 |

20 | 41 | 36 | 27 | 25 |

Construct a ranked stem-and-leaf display for the data.

Question 2:

Following are the temperatures (in ∘F) observed during eight wintry days in a midwestern city (sample):

23 17 6 −7 −2 11 16 12

Find the range, variance, and standard deviation.

Round your answers to two decimal places, where appropriate.

Range = Enter you answer; Range ∘F

Variance = Enter you answer; Variance

Standard deviation = Enter you answer; Standard deviation

Question 3:

A sample of 3000 observations has a mean of 86 and a standard deviation of 10. The distribution is bell-shaped. Using the empirical rule, find what percentage of the observations fall in the intervals x¯±1s, x¯±2s, and x¯±3s.

Enter the exact answers.

Approximately Enter you answer; 1s % of the observations fall in
the interval x¯±1s.

Approximately Enter you answer; 2s % of the observations fall in
the interval x¯±2s.

Answer #1

1)

Stem | Leaf |

1 | 2 4 4 |

2 | 0 2 2 3 3 5 7 |

3 | 2 4 5 6 7 |

4 | 1 1 6 6 |

5 | 1 |

2)

Range = 30

Variance = 100.86

Standard deviation = 10.04

3)

Approximately Enter you answer; 1s % of the observations fall in the interval x¯±1s.

(76,96)

Approximately Enter you answer; 2s % of the observations fall in
the interval x¯±2s.

(66,106)

Approximately Enter you answer; 3s % of the observations fall in the interval x¯±3s.

(56,116)

approximately **68%** of observations lies
within x¯±1s.

approximately **95%** fall within x¯±2s.

approximately **99.7%** falls within x¯±3s.

A professor records the time (in minutes) that it takes 16
students to complete an exam. Compute the SS, the
variance, and the standard deviation assuming the 16 students
constitute a population and assuming the 16 students constitute a
sample. (Round your answers for variance and standard deviation to
two decimal places.)
25
16
49
40
27
39
38
43
23
41
22
35
46
50
52
42
(a) the 16 students constitute a population
SS
variance
standard...

Consider the following data which describe the amount of time in
minutes students spend studying for a quiz:[10, 11, 11, 12, 12, 14,
15, 18, 19, 20, 22, 24, 39, 40, 41, 44, 46, 50, 52, 52, 53, 55, 70]
What numbers make up the stem?
Question 16 options:
0,1,1,2,2,4,5,8,9,0,2,4,9,0,1,4,6,0,2,2,3,5,0
1,2,3,4,5,7
None of the above
1,2,3,4,5,6,7

The following data represent the travel time (in minutes) to
school for seven students enrolled in Chaffey College. Treat the
seven students as a sample.
Student
Travel time
John
30
Jeff
24
Kevin
14
Ron
40
Noel
32
Mary
22
Christy
27
(a) Find standard deviation of the sample. (b) Find variance of
the sample.

The following is a small data set of 25
observations. I want you to calculate some statistics by
hand to cement the class material. You can use the regular formula
for the variance or the computational formula - I’m just interested
in the correct result. If you use the computational formula, you
will want to calculate a separate row of each value squared in
order to calculate the Sum(x^2). Excel can be used to solve
this problem.
Var
28
4...

For the following Simple data ( separately ) :
18 , 30 , 14 , 21 , 25 , 24 , 34 , 15 , 25 , 26 , 18 , 24 , 18 , 33
, 20
1) Find ( Mean , Mode , Median , Range , Midrange , Standard
Deviation , Variance )
2) Sketch the distribution Shapes approximately.
3) Determine the type of shape
4) Find coefficient of variation
5) Find the value of the 20th...

Question 1:
The following information is obtained from a sample data
set.
n = 20 , ∑x = 130 , ∑y = 960 ,
∑x y = 4908 , ∑x 2 = 882
Find the estimated regression line.
y ^ = Enter you answer to the field 1 in accordance
to the question statement + ( Enter you answer to the field 2 in
accordance to the question statement ) x
Question 2:
A sample data set produced the following...

The following 2 parts relate to this scenario and data. (Data
listed below)
1. Consider the two separate samples given in
the data set (samplecomparison.xlsx). Answer the questions
below.
The range of the first data set is _____ .
The variance of the first data set is _____ . (Round to three
decimal places as needed)
The standard deviation of the first data set is _____ . (Round
to three decimal places as needed)
The range of the second data...

Question 7
7. The following data are the number of burglaries reported for
a specific year for nine western Pennsylvania universities. Find
the variance.
61, 11, 1, 3, 2, 30, 18, 3, 7
a.
385.36
b.
640.36
c.
19.63
d.
570.89
Question 8
8. Eighty randomly selected light bulbs were tested to
determine their lifetimes in hours. This frequency distribution was
obtained. Find the standard deviation.
Class Boundaries
Frequency
52.5-63.5
10
63.5-74.5
13
74.5-85.5
28
85.5-96.5
15
96.5-107.5
14
a....

Use Stats Disk if needed!!
Question=
Based on this data, create an interval for which we would
consider it "usual" for a randomly selected participant to fall
within.
1-6
2-1
3-1
4-4
5-6
6-8
7-2
8-2
9-4
10-5
11-7
12-10
13-6
14-3
15-2
16-1
17-Something
.............
18-1
19-2
20-3
21-5
22-7
23-8
24-2
25-3
26-2
27-2
28-4
29-3
30-4
31-6
32-1
33-1
34-6
35-4
36-4
37-3
38-1
39-1
40-5
41-8
42-1
43-7
44-9
45-2
46-9
47-7
48-8
49-4
..........
50-2

Part 2 (Numerical Descriptive Techniques)
The following data represent the ages of a sample of 25
employees from a government department. Enter this data on a sheet
called Employee Data.
31
43
56
23
49
42
33
61
44 28
48
38
44
35
40
64
52
42
47 39
53
27
36
35 20
Find the median age.
Find the lower quartile of the ages.
Find the upper quartile of the ages.
Compute the range and...

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