10. Comparing Colleges. A researcher obtains random samples of SAT scores from students at three different...
10. Comparing Colleges. A researcher obtains random samples of
SAT scores from students at three different colleges. She plans to
use the three sets of sample data with the method of analysis of
variance. Identify the null and alternative hypothesis.
Homework Answers
Hypothesis :
Null hypothesis
H0 : there is no significant difference between among the collages.
Alternative hypothesis
Ha : there is at least one significant difference among the collages.
Add Answer to:
10. Comparing Colleges. A researcher obtains random samples of
SAT scores from students at three different...
A researcher wants to determine whether high school students who attend an SAT preparation course score...
A researcher wants to determine whether high school students who attend an SAT preparation course score significantly different on the SAT than students who do not attend the preparation course. For those who do not attend the course, the population mean is 1050 (? = 1050). The 16 students who attend the preparation course average 1200on the SAT, with a sample standard deviation of 100. On the basis of these data, can the researcher conclude that the preparation course has...
A researcher wants to determine whether high school students who attend an SAT preparation course score...
A researcher wants to determine whether high school students who attend an SAT preparation course score significantly different on the SAT than students who do not attend the preparation course. For those who do not attend the course, the population mean is 1050 (? = 1050). The 16 students who attend the preparation course average 1150 on the SAT, with a sample standard deviation of 300. On the basis of these data, can the researcher conclude that the preparation course...
A company that sells an online course aimed at helping high-school students improve their SAT scores...
A company that sells an online course aimed at helping high-school students improve their SAT scores has claimed that SAT scores will improve by more than 90 points on average if students successfully complete the course. To test this, a national school counseling organization plans to select a random sample of n = 100 students who have previously taken the SAT test. These students will take the company's course and then retake the SAT test. Assuming that the population standard...
The following data are scores on a standardized statistics examination for independent random samples of students...
The following data are scores on a standardized statistics examination for independent random samples of students from two small liberal arts colleges. College A 78, 84, 81, 78, 76, 83, 79, 75, 85, 81 College B: 89, 78,83, 85, 87,78, 85,94, 88, 87 Use these data for question on this task. Consider the test of hypothesis Ha: Populations have the same location parameter H.: Populations have different location parameters 3. Use information in Questions 1 and 2 to make a...
1. Nine students took the SAT test. Their scores are listed below. Later on, they took...
1. Nine students took the SAT test. Their scores are listed below. Later on, they took a test preparation course and retook the SAT. Their new scores are listed below. Use the Sign test to test the claim that the test preparation has no effect on their scores. Use α = 0.05. Student 1 2 3 4 5 6 7 8 9 Before 860 820 910 990 1000 930 870 1180 920 After 880 820 900 1030 1030 940 860...
9. (10 points) A researcher was interested in comparing the GPAs of male and female students...
9. (10 points) A researcher was interested in comparing the GPAs of male and female students at CofC. Two independent simple random samples of 49 females and 36 males Cof students resulted in the following summaries: Females: R1 = 3.25, s; = 0.26; Males: fz = 3.06,82 = 0.59. Is it reasonable to think that female CofC students have a higher mean GPA than male CofC students? a) State the null and altemative hypotheses symbolically. b) Check assumptions and choose...
You are interested in comparing SAT scores between high school students from public vs. private schools....
You are interested in comparing SAT scores between high school students from public vs. private schools. You have collected data from a sample of high school students from public and private schools and asked them to complete a survey that measures their SAT scores. The level of measurement for the SAT scores variable is ratio. What type of test can be used to analyze the data in order to compare the scores between public and private school students? a) independent...
A researcher was interested in comparing the heights of women in two different countries.
A researcher was interested in comparing the heights of women in two different countries. Independent simple random samples of 9 women from country A and 9 women from country B yielded the following heights (in inches). Country A: 64.1 66.4 61.7 62.0 67.3 64.9 64.7 68.0 Country B: 65.3 60.2 61.7 65.8 61.0 64.6 60.0 65.4 59.0 At the 5% significance level, do the data provide sufficient evidence to conclude that the mean height of women in country A is different from the...
The following table summarizes the results of a study on SAT prep courses, comparing SAT scores...
The following table summarizes the results of a study on SAT prep courses, comparing SAT scores of students in a private preparation class, a high school preparation class, and no preparation class. Use the information from the table to answer the remaining questions Number of Sum of Treatment Private prep class High school prep class No prep class Observations Sample Mean Squares (SS) 690 680 640 60 60 60 265,500.00 276,120.00 302,670.00 Using the data provided, complete the partial ANOVA...
A researcher was interested in comparing the heights of women in two different countries
A researcher was interested in comparing the heights of women in two different countries. Independent simple random samples of 9 women from country A and 9 women from country B yielded the following heights (in inches). Country A: 64.1 66.4 61.7 62.0 67.3 64.9 64.7 68.0 63.6 Country B: 65.3 60.2 61.7 65.8 61.0 64.6 60.0 65.4 59.0 At the 5% significance level, do the data provide sufficient evidence to conclude that the mean height of women in country A is different from...
A company that sells an online course aimed at helping high-school students improve their SAT scores has claimed that SAT scores will improve by more than 90 points on average if students successfully complete the course. To test this, a national school counseling organization plans to select a random sample of n = 100 students who have previously taken the SAT test. These students will take the company's course and then retake the SAT test. Assuming that the population standard...
The following data are scores on a standardized statistics examination for independent random samples of students from two small liberal arts colleges. College A 78, 84, 81, 78, 76, 83, 79, 75, 85, 81 College B: 89, 78,83, 85, 87,78, 85,94, 88, 87 Use these data for question on this task. Consider the test of hypothesis Ha: Populations have the same location parameter H.: Populations have different location parameters 3. Use information in Questions 1 and 2 to make a...
9. (10 points) A researcher was interested in comparing the GPAs of male and female students at CofC. Two independent simple random samples of 49 females and 36 males Cof students resulted in the following summaries: Females: R1 = 3.25, s; = 0.26; Males: fz = 3.06,82 = 0.59. Is it reasonable to think that female CofC students have a higher mean GPA than male CofC students? a) State the null and altemative hypotheses symbolically. b) Check assumptions and choose...
The following table summarizes the results of a study on SAT prep courses, comparing SAT scores of students in a private preparation class, a high school preparation class, and no preparation class. Use the information from the table to answer the remaining questions Number of Sum of Treatment Private prep class High school prep class No prep class Observations Sample Mean Squares (SS) 690 680 640 60 60 60 265,500.00 276,120.00 302,670.00 Using the data provided, complete the partial ANOVA...
Most questions answered within 3 hours.
-
Apply the four-stage New Product Development model shown in page
325 of your text book
(Concept...
asked 1 minute ago -
An enzyme catalyzes the reaction A ⇌ B. The enzyme is present at
a concentration of...
asked 9 minutes ago -
The number of years of education of self-employed individuals in
the United States has a population...
asked 36 minutes ago -
Using the TI-84 calculator, find the area under the standard
normal curve that lies outside the...
asked 23 minutes ago -
You are considering the purchase of a share of Edie's common
stock. You expect to sell...
asked 25 minutes ago -
Assembly Programming
INCLUDE Irvine32.inc
Make a program that takes a string and a word as inputs...
asked 33 minutes ago -
Can I get a C++ code and output for this program using classes
instead of using...
asked 39 minutes ago -
A 4.0 L flask containing chlorine gas is connected to an
evacuated 3.0 L flask. If...
asked 49 minutes ago -
Write an essay containing your thoughts on
whether corporations should be limited in the amount of...
asked 50 minutes ago -
Given the following two sequences x (n)=[3 , 11,7 ,0 ,−1, 4 ,2
],−3≤n≤ 3 ;...
asked 50 minutes ago -
What is the minimal sample size needed for a 95% confidence
interval to have a maximal...
asked 51 minutes ago -
1. Methods of collecting data - Experiments and direct
observation
In each of the following situations,...
asked 1 hour ago