Question

1. The following attachment contains the values of two different financial stocks during a one month period. What is the coefficient of correlation between the two values?

Date | APPEL | |

2/22/2017 | 137.11 | 829.59 |

2/23/2017 | 136.52 | 830.46 |

2/24/2017 | 136.66 | 848.4 |

2/27/2017 | 136.92 | 852.11 |

2/28/2017 | 136.99 | 848.78 |

3/1/2017 | 139.78 | 847.2 |

3/2/2017 | 138.96 | 845.61 |

3/3/2017 | 139.77 | 845.53 |

3/6/2017 | 139.33 | 843.25 |

3/7/2017 | 139.52 | 838.67 |

3/8/2017 | 139 | 835.36 |

3/9/2017 | 138.67 | 831.9 |

3/10/2017 | 139.13 | 827.78 |

3/13/2017 | 139.19 | 829.08 |

3/14/2017 | 138.99 | 830.63 |

3/15/2017 | 140.46 | 835.23 |

3/16/2017 | 140.69 | 823.21 |

3/17/2017 | 139.99 | 829.28 |

3/20/2017 | 141.46 | 828.64 |

3/21/2017 | 139.83 | 831.33 |

3/22/2017 | 141.41 | 830.76 |

a. 0.60

b. -0.86

c. -0.42

d. -0.61

Answer #1

For the given values

Key

X: X Values=APPEL

Y: Y Values= GOOGLE

Mx: Mean of X Values

My: Mean of Y Values

X - Mx & Y - My: Deviation scores

(X - Mx)2 & (Y - My)2: Deviation Squared

(X - Mx)(Y - My): Product of Deviation Score

X Values

∑ = 2920.38

Mean = 139.066

∑(X - Mx)2 = SSx = 43.735

Y Values

∑ = 17562.8

Mean = 836.324

∑(Y - My)2 = SSy = 1488.785

X and Y Combined

N = 21

∑(X - Mx)(Y - My) = -108.314

Hence

r Calculation

r = ∑((X - My)(Y - Mx)) / √((SSx)(SSy))

r = -108.314 / √((43.735)(1488.785)) = -0.4245

So correlation coefficient is -0.42

A manufacturing company is purchasing metal pipes of standard
length from two different suppliers, ABC and XYZ. In the past two
months there are increasing complaints by the Production Manager
that delivery times by ABC present higher variability in comparison
to the delivery times by XYZ. The Production Manager is worried
that this variability will make it harder to efficiently schedule
the production process. If the variance of XYZ remains unchanged,
what should be the variance of ABC in order...

A manufacturing company is purchasing metal pipes of standard
length from two different suppliers, ABC and XYZ. In the past two
months there are increasing complaints by the Production Manager
that delivery times by ABC present higher variability in comparison
to the delivery times by XYZ. The Production Manager is worried
that this variability will make it harder to efficiently schedule
the production process.
Does the sample data indicate a statistically significant
difference at the 5% level? Justify your answer....

A manufacturing company is purchasing metal pipes of standard
length from two different suppliers, ABC and XYZ. In the past two
months there are increasing complaints by the Production Manager
that delivery times by ABC present higher variability in comparison
to the delivery times by XYZ. The Production Manager is worried
that this variability will make it harder to efficiently schedule
the production process. Does the sample data indicate a
statistically significant difference at the 5% level? Justify your
answer....

A box contains four slips of paper marked 9, 10, 11, and 12. Two
slips are selected without replacement. List the possible values
for each of the following random variables shown below:
(a) x = sum of the two numbers
20, 21, 23, 24, 26
20, 22, 24, 26, 28
9, 10, 11, 12, 13
19, 20, 21, 22, 23
19, 21, 23, 25, 27
(b) y = difference between the first and second
numbers
-3, -1, 1, 3
-5,...

The table below shows average daily sales of Rice Krispies in
the month of June in 74 Noodles & Company restaurants. Use the
following data set and answer the questions
32
8
14
20
28
19
37
31
16
16
16
29
11
34
31
18
22
17
27
16
24
49
25
18
25
21
15
16
20
11
21
29
14
25
10
15
8
12
12
19
21
28
27
26
12
24
18
19
24
16...

A company has the following returns over the past 30 months:
Month Ret.(%) Month Ret.(%) Month Ret.(%)
1) 3 11 -3 21 -1
2) -16 12 -2 22 -24
3) 31 13 -8 23 -14
4) 33 14 2 24 -19
5) -23 15 35 25 -19
6) -17 16 11 26 33
7) 8 17 -20 27 -18
8) -19 18 15 28 23
9) -13 19 -12 29 6
10 -17 20 17 30 5
What is...

The Columbus Dispatch conducted a study. Two identical football,
one filled with helium and one filled with ordinary air, were used.
A casual observer was unable to detect a difference in the two
footballs. A novice kicker was used to punt the footballs. A trial
consisted of kicking both footballs in a random order. The kicker
did not know which football he was kicking. The distance of each
punt was recorded, then another trial was conducted. A total of 39...

Given the following frequency table of data, what is the
potential outlier?
Value
Frequency
15
1
16
0
17
3
18
4
19
6
20
10
21
3
22
2
23
1
24
0
25
0
26
0
27
0
28
0
29
0
30
1
Select the correct answer below:
30
18
23
19
17

The following table contains recorded values on a level
transmitter of a tank that’s holding water.
The samples are taken every hour for 24 hours.
Hours
1
2
3
4
5
6
7
8
9
10
11
12
Litres
100
101
104
106
99
50
103
91
110
91
93
92
Hours
13
14
15
16
17
18
19
20
21
22
23
24
Litres
95
96
91
92
101
104
106
125
106
101
104
100
Calculate the following...

The SAT and the ACT are the two major standardized tests that
colleges use to evaluate candidates. Most students take just one of
these tests. However, some students take both. The data data141.dat
gives the scores of 60 students who did this. How can we relate the
two tests? (a) Plot the data with SAT on the x axis and ACT on the
y axis. Describe the overall pattern and any unusual observations.
(b) Find the least-squares regression line and...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 12 minutes ago

asked 12 minutes ago

asked 17 minutes ago

asked 23 minutes ago

asked 34 minutes ago

asked 26 minutes ago

asked 26 minutes ago

asked 36 minutes ago

asked 40 minutes ago

asked 40 minutes ago

asked 1 hour ago