Homework Answers
a)
b)
| ΣX | ΣY | Σ(x-x̅)² | Σ(y-ȳ)² | Σ(x-x̅)(y-ȳ) | |
| total sum | 985.00 | 1036.00 | 6986.94 | 620.94 | 1230.94 |
| mean | 57.94 | 60.94 | SSxx | SSyy | SSxy |
correlation coefficient , r = SSxy/√(SSx.SSy)
= 0.591
c) Regression line is, Ŷ= 50.733 + ( 0.176 )*x
d)
Predicted Y at X= 50 is
Ŷ= 50.7333 +
0.1762 *50= 59.542
e)
because it lead to underplotation of value of x (outside the range of x) that may lead to wrong predicted value
Add Answer to:
The accompanying data are a subset of data from the report "Great Jobs, Great Lives."+ The...
For the data set below (a) Determine the least-squares regression line. (b) Compute the sum of...
For the data set below (a) Determine the least-squares regression line. (b) Compute the sum of the squared residuals for the least-squares regression line. x 30 40 50 60 70 y 80 73 64 48 43 (a) Determine the least-squares regression line. ỳ-Ux + ] (Round to four decimal places as needed.) (b) The sum of the squared residuals is (Round to two decimal places as needed.)
(14 points) College Graduation Rates. Data from the College Results Online website compared the 2011 graduation...
(14 points) College Graduation Rates. Data
from the College Results Online website compared the 2011
graduation rate and median SAT score for 92 similar-sized public
universities and colleges in the United States. The scatterplot
below shows the relationship between these two variables along with
the least squares fit. Round all calculated results to 4 decimal
places.
(14 points) College Graduation Rates. Data from the College Results Online website compared the 2011 graduation rate and median SAT score for 92 similar-sized...
You are the foreman of the Bar-S cattle ranch in Colorado. A neighboring ranch has calves...
You are the foreman of the Bar-S cattle ranch in Colorado. A neighboring ranch has calves for sale, and you are going to buy some calves to add to the Bar-S herd. How much should a healthy call weigh? Let x be the age of the call (in weeks), and let y be the weight of the calf (in Ilograms). X y 3 40 16 100 74 20 150 30 200 54 Verify the given sure Ix, Ly, Ix2, 3y2...
(a) The director of an alumni association for a university wants to look at the relationship between the number of year...
(a) The director of an alumni association for a university wants to look at the relationship between the number of years since graduation and the amount of monetary contribution an alumnus makes to the university. He collects data on 50 alumni who have made contributions this year. The number of years since graduation has a mean of 7, and the amount of contribution has a mean of 195 dollars. Based on the least squares regression line fitted to the data,...
(1 point) The following data, taken from 8 towns in Alberta, are the percentage of residents...
(1 point) The following data, taken from 8 towns in Alberta, are the percentage of residents who are university graduates and the median household incomes (in $ 1000's) for all households in each town. Graduates (%) Median Income ($ 1000) 61.7 47.6 50.9 34.1 31.5 57.1 56.4 41.3 42.8 34.5 42.1 28.1 33.2 23.1 19.2 20.4 Use two-decimal places in your answers. (a) State the slope term and the Y -intercept term of the least squares regression line which attempts...
The least-squares regression line with y = inpatient cost-to-charge ratio and x = outpatient cost-to-charge ratio...
The least-squares regression line with y = inpatient
cost-to-charge ratio and x = outpatient cost-to-charge
ratio is = -1.1 + 1.29 x.
(a) Is the observation for Hospital 11 an influential
observation?
YesNo
(b) Is the observation for Hospital 11 an outlier?
YesNo
(c) Is the observation for Hospital 5 an influential
observation?
YesNo
(d) Is the observation for Hospital 5 an outlier?
YesNo
Cost-to-charge ratlo (the percentage of the amount billed that represents the actual cost) for Inpatient and outpatient...
Business Statistics
Alumni donations are an important source of revenue for college and universities. If administrators could determine the factors that could lead to increases in thepercentage of alumni who make a donation, they might be able to implement policies that could lead to increased revenues. Research shows that students who are moresatisfied with their contact with teachers are more likely to graduate. As a result, one might suspect that smaller class sizes and lower student-faculty ratios mightlead to a higher percentage...
pleass help im stuck on this question To identify high-paying jobs for people who do not...
pleass help im stuck on this question
To identify high-paying jobs for people who do not ke stress, suppose the following data were collected sho teci Day to answer this ($1,000s) and the stress tolerance for a variety of occupations Job Average Annual Salary ($1,000s) Stress Tolerance Art directors 81 69.0 Astronomers 96 62.0 Audiologists 70 67.5 Dental hygienists 70 70.3 Economists 92 Engineers 69.5 92 62.8 Law teachers 100 65.5 Optometrists 98 102 60.1 Political scientists Urban and regional...
Correlation/Linear Regression (20-25) The scatterplot below shows the drop height (in feet) and speed (in mph)...
Correlation/Linear Regression (20-25) The scatterplot below shows the drop height (in feet) and speed (in mph) of 75 rollercoasters. Answer the following questions using this data. Speed 80 70 60 50 40 50 100 150 200 250 300 Drop 20. Describe the scatterplot above. Be sure to use the three key descriptors 21. Which of the following is the most likely value of the correlation coefficient (r) for this data? (Circle one) A)r0.523 B)r 0.187 D)r 0.9097 D)r0.875 22. Which...
Section 6.2 The apparent temperature or he it feels despite what the thermometer says. The more m...
Section 6.2 The apparent temperature or he it feels despite what the thermometer says. The more moisture that is in the air the hotter it will feel. The chart shows the heat index for a temperature of 90° as a function of humidity. at index is a measure of how hot 3. Humidity (%) Heat index ( FO) 91 93 95 97 100 103 105 109 45 Use regression to find a quadratic equation to model the data. Round the...
For the data set below (a) Determine the least-squares regression line. (b) Compute the sum of the squared residuals for the least-squares regression line. x 30 40 50 60 70 y 80 73 64 48 43 (a) Determine the least-squares regression line. ỳ-Ux + ] (Round to four decimal places as needed.) (b) The sum of the squared residuals is (Round to two decimal places as needed.)
(14 points) College Graduation Rates. Data
from the College Results Online website compared the 2011
graduation rate and median SAT score for 92 similar-sized public
universities and colleges in the United States. The scatterplot
below shows the relationship between these two variables along with
the least squares fit. Round all calculated results to 4 decimal
places.
(14 points) College Graduation Rates. Data from the College Results Online website compared the 2011 graduation rate and median SAT score for 92 similar-sized...
You are the foreman of the Bar-S cattle ranch in Colorado. A neighboring ranch has calves for sale, and you are going to buy some calves to add to the Bar-S herd. How much should a healthy call weigh? Let x be the age of the call (in weeks), and let y be the weight of the calf (in Ilograms). X y 3 40 16 100 74 20 150 30 200 54 Verify the given sure Ix, Ly, Ix2, 3y2...
(a) The director of an alumni association for a university wants to look at the relationship between the number of years since graduation and the amount of monetary contribution an alumnus makes to the university. He collects data on 50 alumni who have made contributions this year. The number of years since graduation has a mean of 7, and the amount of contribution has a mean of 195 dollars. Based on the least squares regression line fitted to the data,...
(1 point) The following data, taken from 8 towns in Alberta, are the percentage of residents who are university graduates and the median household incomes (in $ 1000's) for all households in each town. Graduates (%) Median Income ($ 1000) 61.7 47.6 50.9 34.1 31.5 57.1 56.4 41.3 42.8 34.5 42.1 28.1 33.2 23.1 19.2 20.4 Use two-decimal places in your answers. (a) State the slope term and the Y -intercept term of the least squares regression line which attempts...
The least-squares regression line with y = inpatient
cost-to-charge ratio and x = outpatient cost-to-charge
ratio is = -1.1 + 1.29 x.
(a) Is the observation for Hospital 11 an influential
observation?
YesNo
(b) Is the observation for Hospital 11 an outlier?
YesNo
(c) Is the observation for Hospital 5 an influential
observation?
YesNo
(d) Is the observation for Hospital 5 an outlier?
YesNo
Cost-to-charge ratlo (the percentage of the amount billed that represents the actual cost) for Inpatient and outpatient...
pleass help im stuck on this question
To identify high-paying jobs for people who do not ke stress, suppose the following data were collected sho teci Day to answer this ($1,000s) and the stress tolerance for a variety of occupations Job Average Annual Salary ($1,000s) Stress Tolerance Art directors 81 69.0 Astronomers 96 62.0 Audiologists 70 67.5 Dental hygienists 70 70.3 Economists 92 Engineers 69.5 92 62.8 Law teachers 100 65.5 Optometrists 98 102 60.1 Political scientists Urban and regional...
Correlation/Linear Regression (20-25) The scatterplot below shows the drop height (in feet) and speed (in mph) of 75 rollercoasters. Answer the following questions using this data. Speed 80 70 60 50 40 50 100 150 200 250 300 Drop 20. Describe the scatterplot above. Be sure to use the three key descriptors 21. Which of the following is the most likely value of the correlation coefficient (r) for this data? (Circle one) A)r0.523 B)r 0.187 D)r 0.9097 D)r0.875 22. Which...
Section 6.2 The apparent temperature or he it feels despite what the thermometer says. The more moisture that is in the air the hotter it will feel. The chart shows the heat index for a temperature of 90° as a function of humidity. at index is a measure of how hot 3. Humidity (%) Heat index ( FO) 91 93 95 97 100 103 105 109 45 Use regression to find a quadratic equation to model the data. Round the...
Most questions answered within 3 hours.
-
A coach uses a new technique to train gymnasts. Seven
gymnasts were randomly selected and their...
asked 58 minutes ago -
While rotating the tires on your car you notice a rock [mass =
0.1 Kg] stuck...
asked 2 hours ago -
Using MARS simulator, write MIPS programs according to
the following scenarios: Receive a positive integer number...
asked 4 hours ago -
An object in front of a concave mirror has a real image that is
11.5 cm...
asked 5 hours ago -
Consider the reaction, C3 H8 + O2 --> CO2 + H2O. How many
moles of O2...
asked 6 hours ago -
You and your opponent both roll a fair die. If you both roll the
same number,...
asked 7 hours ago -
In a study of the accuracy of fast food drive-through orders,
Restaurant A had 257 accurate...
asked 7 hours ago -
Identify and describe in detail the four categories of
institutions that could be included in a...
asked 7 hours ago -
In python
class Customer:
def __init__(self, customer_id, last_name, first_name, phone_number, address):
self._customer_id = int(customer_id)
self._last_name =...
asked 7 hours ago -
What is an example of a limitation in implementing a new
ERP system and how it...
asked 7 hours ago -
In a section of 9.7cm of an artery with a radius of 2.6mm there
is a...
asked 7 hours ago -
the two carboxylic acid groups of aspartic acid have different
acidities with pKa values of 2.1...
asked 7 hours ago