Homework Answers
difference of means
a)
b)
| the student t . We assume that both population distributions are approximately normal with unknown standard deviations |
| std error of difference= | √(S21/n1+S22/n2) | = | 0.902 | ||
| test stat t = | (x1-x2-Δo)/Se | = | 2.77 | ||
c)
0.005 < p value <0.025
top right plot is correct
d)
| at the 0.01 level, we reject the null hypothesis and conclude the data are statistically significant |
| There is sufficient evidence at the 0.01 level,,,,,,,,, |
Add Answer to:
The highway department is testing two types of reflecting paint for concrete bridge end pillars. The...
The highway department is testing two types of reflecting paint for concrete bridge end pillars. The...
The highway department is testing two types of reflecting paint for concrete bridge end pillars. The two kinds of paint are alike in every respect except that one is orange and the other is yellow. The orange paint is applied to 12 bridges, and the yellow paint is applied to 12 bridges. After a period of 1 year, reflectometer readings were made on all these bridge end pillars. (A higher reading means better visibility.) For the orange paint, the mean...
The highway department is testing two types of reflecting paint for concrete bridge end pillars. The...
The highway department is testing two types of reflecting paint
for concrete bridge end pillars. The two kinds of paint are alike
in every respect except that one is orange and the other is yellow.
The orange paint is applied to 12 bridges, and the yellow paint is
applied to 12 bridges. After a period of 1 year, reflectometer
readings were made on all these bridge end pillars. (A higher
reading means better visibility.) For the orange paint, the mean...
9. The highway department is testing two types of reflecting paint for concrete bridge end pillars....
9. The highway department is testing two types of reflecting paint for concrete bridge end pillars. The two kinds of paint are alike in every respect except that one is orange and the other is yellow. The orange paint is applied to 12 bridges, and the yellow paint is applied to 10 bridges. After a period of 1 year, reflectometer readings were made on all of these bridge end pillars. (A high reading means better visibility.) For the orange paint,...
A random sample of n = 10 regions in New England gave the following violent crime...
A random sample of n = 10 regions in New England gave the following violent crime rates (per million population). x New England Crime Rate 3.3 3.7 4.2 3.9 3.3 4.1 1.8 4.8 2.9 3.1 Another random sample of n = 12 regions in the Rocky Mountain states gave the following violent crime rates (per million population). x, Rocky Mountain Crime Rate 3.7 4.1 4.7 5.1 3.3 4.8 3.5 2.4 3.1 3.5 5.2 2.8 Assume that the crime rate distribution...
The Toylot company makes an electric train with a motor that it claims will draw an...
The Toylot company makes an electric train with a motor that it claims will draw an average of only 0.8 ampere (A) under a normal load. A sample of nine motors was tested, and it was found that the mean current was x = 1.38 A, with a sample standard deviation of s = 0.41 A. Do the data indicate that the Toylot claim of 0.8 A is too low? (Use a 1% level of significance.) What are we testing...
A hospital reported that the normal death rate for patients with extensive burns (more than 40%...
A hospital reported that the normal death rate for patients with extensive burns (more than 40% of skin area) has been significantly reduced by the use of new fluid plasma compresses. Before the new treatment, the mortality rate for extensive burn patients was about 60%. Using the new compresses, the hospital found that only 42 of 89 patients with extensive burns died. Use a 1% level of significance to test the claim that the mortal ity rate has dropped. What...
= 16 locations in region I gave the A study of fox rabies in a country...
= 16 locations in region I gave the A study of fox rabies in a country gave the following information about different regions and the accurrence of rabies in each region. A random sample of n following information about the number of cases of fox rabies near that location. x, Region I Data 2 8 8 8 6 8 8 1 3 3 3 2 5 1 4 6 A second random sample of n2 = 15 locations in region...
Professor Jennings claims that only 35 of the students at Hora College work while attending school....
Professor Jennings claims that only 35 of the students at Hora College work while attending school. Deon Renata thinks that the professor has underestimated the number of students with part-time or sample of 78 students shows that 37 have jobs. Do the data indicate that more than 35% of the students have Jobs use a level of significance time jobs. A random What are we testing in this pr Single proportion (a) What is the level of significance? State the...
In her book Red Ink Behaviors, Jean Hollands reports on the assessment of leading Silicon Valley...
In her book Red Ink Behaviors, Jean Hollands reports on the assessment of leading Silicon Valley companies regarding a manager's lost time due to inappropriate behavior of employees. Consider the following independent random variables. The first variable x, measures manager's hours per week lost due to hot tempers, flaming e-mails, and general unproductive tensions. x 3 5 6 2 2 4 10 The variable x, measures manager's hours per week lost due to disputes regarding technical workers' superior attitudes that...
Unfortunately, arsenic occurs naturally in some ground water†. A mean arsenic level of μ = 8.0...
Unfortunately, arsenic occurs naturally in some ground water†. A mean arsenic level of μ = 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 41 tests gave a sample mean of x = 7.0 ppb arsenic, with s = 2.6 ppb. Does this information indicate that the mean level of arsenic in this well...
The highway department is testing two types of reflecting paint
for concrete bridge end pillars. The two kinds of paint are alike
in every respect except that one is orange and the other is yellow.
The orange paint is applied to 12 bridges, and the yellow paint is
applied to 12 bridges. After a period of 1 year, reflectometer
readings were made on all these bridge end pillars. (A higher
reading means better visibility.) For the orange paint, the mean...
9. The highway department is testing two types of reflecting paint for concrete bridge end pillars. The two kinds of paint are alike in every respect except that one is orange and the other is yellow. The orange paint is applied to 12 bridges, and the yellow paint is applied to 10 bridges. After a period of 1 year, reflectometer readings were made on all of these bridge end pillars. (A high reading means better visibility.) For the orange paint,...
A random sample of n = 10 regions in New England gave the following violent crime rates (per million population). x New England Crime Rate 3.3 3.7 4.2 3.9 3.3 4.1 1.8 4.8 2.9 3.1 Another random sample of n = 12 regions in the Rocky Mountain states gave the following violent crime rates (per million population). x, Rocky Mountain Crime Rate 3.7 4.1 4.7 5.1 3.3 4.8 3.5 2.4 3.1 3.5 5.2 2.8 Assume that the crime rate distribution...
A hospital reported that the normal death rate for patients with extensive burns (more than 40% of skin area) has been significantly reduced by the use of new fluid plasma compresses. Before the new treatment, the mortality rate for extensive burn patients was about 60%. Using the new compresses, the hospital found that only 42 of 89 patients with extensive burns died. Use a 1% level of significance to test the claim that the mortal ity rate has dropped. What...
= 16 locations in region I gave the A study of fox rabies in a country gave the following information about different regions and the accurrence of rabies in each region. A random sample of n following information about the number of cases of fox rabies near that location. x, Region I Data 2 8 8 8 6 8 8 1 3 3 3 2 5 1 4 6 A second random sample of n2 = 15 locations in region...
Professor Jennings claims that only 35 of the students at Hora College work while attending school. Deon Renata thinks that the professor has underestimated the number of students with part-time or sample of 78 students shows that 37 have jobs. Do the data indicate that more than 35% of the students have Jobs use a level of significance time jobs. A random What are we testing in this pr Single proportion (a) What is the level of significance? State the...
In her book Red Ink Behaviors, Jean Hollands reports on the assessment of leading Silicon Valley companies regarding a manager's lost time due to inappropriate behavior of employees. Consider the following independent random variables. The first variable x, measures manager's hours per week lost due to hot tempers, flaming e-mails, and general unproductive tensions. x 3 5 6 2 2 4 10 The variable x, measures manager's hours per week lost due to disputes regarding technical workers' superior attitudes that...
Most questions answered within 3 hours.
-
Assuming an efficiency of 43.10%, calculate the actual yield of
magnesium nitrate formed from 114.9 g...
asked 12 minutes ago -
The highly pathogenic bacterium Clostridium
perfringens causes gangrene, a disease that results in the
destruction of...
asked 1 hour ago -
In the context of situation analysis, which of the following is
a category for analysis in...
asked 1 hour ago -
In a study of the gas phase decomposition of sulfuryl chloride
at 600 K SO2Cl2(g)SO2(g) +...
asked 2 hours ago -
75 g of 2-propanol (C3H8O) and 25 g of pentane are mixed in a
200 mL...
asked 2 hours ago -
The 2800-turn coil in a dc motor has an area per turn of 1.1 ×
10-2...
asked 2 hours ago -
Draw a combinational logic circuit diagram with a symbol inside
the box for two I/P of...
asked 2 hours ago -
The cliché we use quite a lot in finance is: there is a need to
maximize...
asked 2 hours ago -
In class we discussed the addition of HCl to alpha pinene. Would
you expect one or...
asked 2 hours ago -
I'm trying to explain to my daughter to help her please help
me
I tagged the...
asked 2 hours ago -
You want to accumulate $28,000 in 10 years using annual
payments, the first one in a...
asked 2 hours ago -
1. Name the 4 products obtained from the reactions of the light phase of photosynthesis.
2....
asked 2 hours ago