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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 Flora College work while attending school....
Professor Jennings claims that only 35% of the students at Flora
College work while attending school. Dean Renata thinks that the
professor has underestimated the number of students with part-time
or full-time jobs. A random sample of 85 students shows that 40
have jobs. Do the data indicate that more than 35% of the students
have jobs? Use a 5% level of significance.
What are we testing in this problem?
single meansingle proportion
(a) What is the level of significance?...
Professor Jennings claims that only 35% of the students at Flora College work while attending school. Dean Renata think...
Professor Jennings claims that only 35% of the students at Flora College work while attending school. Dean Renata thinks that the professor has underestimated the number of students with part- full-time jobs. A random sample of 81 students shows that 39 have jobs. Do the data indicate that more than 35% of the students have jobs? Use a 5% level of significance. What are we testing in this problem? single proportion single mean (a) What is the level of significance?...
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...
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...
The Congressional budget Office reports that 36% of federal civilian employees have a bachelor's degree or...
The Congressional budget Office reports that 36% of federal civilian employees have a bachelor's degree or higher (The Wall Street Journa). A random sample of 115 employees in the private sector showed that I have a bachelor's degree or higher. Does this indicate that the percentage of employees holding bachelor's degrees or higher in the private sector is less than in the federal avan sector? Use a 0.05. What are we testing in this problem? Single proportion single mean (a)...
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 U.S. Office of Personnel Management reports that 51% of federal civilian employees have a bachelor's...
The U.S. Office of Personnel Management reports that 51% of
federal civilian employees have a bachelor's degree or higher
(OPM.gov). A random sample of 106 employees in the private
sector showed that 44 have a bachelor's degree or higher. Does this
indicate that the percentage of employees holding bachelor's
degrees or higher in the private sector is less than in the federal
civilian sector? Use α = 0.05.
What are we testing in this problem?
single meansingle proportion
(a) What...
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...
What is your favorite color? A large survey of countries, including the United States, China, Russia,...
What is your favorite color? A large survey of countries,
including the United States, China, Russia, France, Turkey, Kenya,
and others, indicated that most people prefer the color blue. In
fact, about 24% of the population claim blue as their favorite
color.† Suppose a random sample of n = 54 college students
were surveyed and r = 10 of them said that blue is their
favorite color. Does this information imply that the color
preference of all college students is...
Although older Americans are most afraid of crime, it is young people who are more likely to be t...
Although older Americans are most afraid of crime, it is young people who are more likely to be the actual victims of crime. It seems that older people are more cautious about the people with whom they associate. A national survey showed that 10% of all people ages 16-19 have been victims of crime.† At Jefferson High School, a random sample of n = 66 students (ages 16-19) showed that r = 9 had been victims of a crime. Note:...
Professor Jennings claims that only 35% of the students at Flora
College work while attending school. Dean Renata thinks that the
professor has underestimated the number of students with part-time
or full-time jobs. A random sample of 85 students shows that 40
have jobs. Do the data indicate that more than 35% of the students
have jobs? Use a 5% level of significance.
What are we testing in this problem?
single meansingle proportion
(a) What is the level of significance?...
Professor Jennings claims that only 35% of the students at Flora College work while attending school. Dean Renata thinks that the professor has underestimated the number of students with part- full-time jobs. A random sample of 81 students shows that 39 have jobs. Do the data indicate that more than 35% of the students have jobs? Use a 5% level of significance. What are we testing in this problem? single proportion single mean (a) What is the level of significance?...
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...
The Congressional budget Office reports that 36% of federal civilian employees have a bachelor's degree or higher (The Wall Street Journa). A random sample of 115 employees in the private sector showed that I have a bachelor's degree or higher. Does this indicate that the percentage of employees holding bachelor's degrees or higher in the private sector is less than in the federal avan sector? Use a 0.05. What are we testing in this problem? Single proportion single mean (a)...
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 U.S. Office of Personnel Management reports that 51% of
federal civilian employees have a bachelor's degree or higher
(OPM.gov). A random sample of 106 employees in the private
sector showed that 44 have a bachelor's degree or higher. Does this
indicate that the percentage of employees holding bachelor's
degrees or higher in the private sector is less than in the federal
civilian sector? Use α = 0.05.
What are we testing in this problem?
single meansingle proportion
(a) What...
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...
What is your favorite color? A large survey of countries,
including the United States, China, Russia, France, Turkey, Kenya,
and others, indicated that most people prefer the color blue. In
fact, about 24% of the population claim blue as their favorite
color.† Suppose a random sample of n = 54 college students
were surveyed and r = 10 of them said that blue is their
favorite color. Does this information imply that the color
preference of all college students is...
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