Last fall, a sample of n = 36 freshmen was selected to participate in a new...
Last fall, a sample of n = 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate the effectiveness of the new program, the sample was compared with the rest of the freshman class. All freshmen must take the same English Language Skills course, and the mean score on the final exam for the entire freshman class was μ = 74.The students in the new program had a mean score of M = 78.5 with a standard deviation of s = 15.
(a) On the basis of these data, can the college conclude that the students in the new program performed significantly better than the rest of the freshman class? Use a one-tailed test with α= 0.05. (Round your answers to three decimal places.)
| t-critical = | |
| t = |
> (b) Can the college conclude that the students in the new
program are significantly different from the rest of the freshman
class? Use a two-tailed test with α = 0.05. (Round your
answers to three decimal places.)
| t-critical = ± | |
| t = |
Homework Answers
Add Answer to:
Last fall, a sample of n = 36 freshmen was selected to
participate in a new...
Business Stat
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 9 of this year's entering students and finds that their mean IQ score is 112, with standard deviation of 11. The college records indicate that the mean IQ score for entering students from previous years is 111. If we assume that the IQ scores of this year's entering class are normally distributed, is there enough evidence to conclude, at the 0.05 level of significance,...
A college professor claims that the entering class this year appears to be smarter than entering...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 22 this year's entering students and finds that their mean IQ score is 119, with standard deviation of 15. The college records indicate that the mean IQ score for entering students from previous years is 112. If we assume that the IQ scores of this year's entering class are normally distributed, is there enough...
A college professor claims that the entering class this year appears to be smarter than entering classes from previ...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 22 of this year's entering students and finds that their mean 1Q score is 119, with standard deviation of 15. The college records indicate that the mean 1Q score for entering students from previous years is 112. If we assume that the 1Q scores of this year's entering class are normally distributed, is there...
A college admissions officer takes a simple random sample of 100 entering freshmen and computes their...
A college admissions officer takes a simple random sample of 100 entering freshmen and computes their mean mathematics SAT score to be 458. It is know that the population standard deviation of all mathematics SAT scores is 116. a. What function would you use to create a confidence interval for the mean mathematics SAT score for the entering freshman class? b. Create a 99% confidence interval for the mean mathematics SAT score for the entering freshman class. Round to 2...
A college admissions officer takes a simple random sample of 100 entering freshmen and computes their...
A college admissions officer takes a simple random sample of 100 entering freshmen and computes their mean mathematics SAT score to be 458. It is know that the population standard deviation of all mathematics SAT scores is 116. a. What function would you use to create a confidence interval for the mean mathematics SAT score for the entering freshman class? b. Create a 99% confidence interval for the mean mathematics SAT score for the entering freshman class. Round to 2...
To test the effectiveness of a treatment, a sample of n = 36 people is selected...
To test the effectiveness of a treatment, a sample of n = 36 people is selected from a normal population with mean of μ = 60. After the treatment is administered to the individuals in the sample, the sample mean is found to be M = 55. (a) If the population standard deviation is σ = 13, can you conclude that the treatment has a significant effect? Use a two-tailed test with α = 0.05. (Round your answers to two...
1. A university researcher is interested in whether efforts to recruit more top high school students...
1. A university researcher is interested in whether efforts to recruit more top high school students have been successful. To test this, she randomly selects 50 freshmen from the university and records their high school GPA. The mean is 2.75 with a standard deviation of 0.50. The researcher also knows that the mean high school GPA of all freshmen enrolled at the university five years ago was 3.00 with a standard deviation of 0.66. The researcher wants to know if...
A random sample of vehicles n=36 were selected and fitted with a new brake design. a standardized...
A random sample of vehicles n=36 were selected and fitted with a new brake design. a standardized breaking test was then performed on all the vehicles and the stopping distance was recorded. the population stopping distance using this test is a mean of 65 ft with a standard deviation of 12 ft. you find the mean stopping distance for your sample is 60 ft. your job is to determine if the new brake design significantly decreased the stopping distance of...
A college professor claims that the entering class this year appears to be smarter than entering...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 13 of this year's entering students and finds that their mean IQ score is 119, with standard deviation of 11. The college records indicate that the mean IQ score for entering students from previous years is 112. If we assume that the IQ scores of this year's entering class are normally distributed, is there...
Focusing on the last part 41. Gravetter/Wallnau/Forzano, Essentials-Chapter 8-End-of-chaptor question 15 Aa Aa A high school...
Focusing on the last part
41. Gravetter/Wallnau/Forzano, Essentials-Chapter 8-End-of-chaptor question 15 Aa Aa A high school teacher has designed a new course intended to help students prepare for the mathematics section of the SAT. A sample of n -20 students is rearuited to take the course and, at the end of the year, each student takes the SAT. The average score for this sample is M 562. For the general population, scores on the SAT are standardized to form a...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 22 this year's entering students and finds that their mean IQ score is 119, with standard deviation of 15. The college records indicate that the mean IQ score for entering students from previous years is 112. If we assume that the IQ scores of this year's entering class are normally distributed, is there enough...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 22 of this year's entering students and finds that their mean 1Q score is 119, with standard deviation of 15. The college records indicate that the mean 1Q score for entering students from previous years is 112. If we assume that the 1Q scores of this year's entering class are normally distributed, is there...
A college admissions officer takes a simple random sample of 100 entering freshmen and computes their mean mathematics SAT score to be 458. It is know that the population standard deviation of all mathematics SAT scores is 116. a. What function would you use to create a confidence interval for the mean mathematics SAT score for the entering freshman class? b. Create a 99% confidence interval for the mean mathematics SAT score for the entering freshman class. Round to 2...
A college admissions officer takes a simple random sample of 100 entering freshmen and computes their mean mathematics SAT score to be 458. It is know that the population standard deviation of all mathematics SAT scores is 116. a. What function would you use to create a confidence interval for the mean mathematics SAT score for the entering freshman class? b. Create a 99% confidence interval for the mean mathematics SAT score for the entering freshman class. Round to 2...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 13 of this year's entering students and finds that their mean IQ score is 119, with standard deviation of 11. The college records indicate that the mean IQ score for entering students from previous years is 112. If we assume that the IQ scores of this year's entering class are normally distributed, is there...
Focusing on the last part
41. Gravetter/Wallnau/Forzano, Essentials-Chapter 8-End-of-chaptor question 15 Aa Aa A high school teacher has designed a new course intended to help students prepare for the mathematics section of the SAT. A sample of n -20 students is rearuited to take the course and, at the end of the year, each student takes the SAT. The average score for this sample is M 562. For the general population, scores on the SAT are standardized to form a...
Most questions answered within 3 hours.
-
Assume that the population of Mexico is 128
million and that the population increases 1.01
percentannually....
asked 5 minutes ago -
Can someone please help me add appropriate descriptive
comments to each line of code in the...
asked 11 minutes ago -
Romeo wishes to throw a bouquet of flowers to Juliet, who is on
a second-story balcony,...
asked 1 hour ago -
Why is QE a controversial monetary policy tool.
A. It may lead to excessive inflation.B. By...
asked 1 hour ago -
Principles of Programming midterm study guide help!
1.)
______ Which of the following would reference the...
asked 55 minutes ago -
A finite potential well has depth U0 = 2.78 eV . What is the
penetration distance...
asked 1 hour ago -
1. The bus bars of a power station are in two sections A and B
separated...
asked 1 hour ago -
Fiscal policy is the deliberate manipulation of taxes and
government spending to alter GDP, employment, inflation...
asked 2 hours ago -
evaluating an expression using only one digit and + and - as
operators ....3+5-1+7-5+8
-----------------------
stack...
asked 2 hours ago -
Two concentric current loops lie in the same plane. The smaller
loop has a radius of...
asked 3 hours ago -
1)Which of the following is an
important difference between qualified and nonqualified retirement
plans?
a. Qualified...
asked 3 hours ago -
What's the streaming business's problem on the
horizon?
asked 4 hours ago