In a survey of 650 community college students, 423 indicated that they have read a book for personal enjoyment during the school year. Construct a 90% confidence interval for the proportion of community college students who have read a book for personal enjoyment during the school year. Use 4 non-zero decimal places in your calculations.
a.Verify the normality condition and the independence condition
b.Find the Z-alpha/2
c.Find the margin of error (ME)
d. Find the upper/lower bound and Interpret the confidence interval
In: Statistics and Probability
An instructor is interested in assessing students' typing speed
in the class. He knows that the average at the university is 49
word per minute (wpm) with a SD of 18 wpm. He collects
data from 31 of his students.
a) What is the probability of the average typing
speed being less than 49 wpm?
probability =
b) What is the proability of the average typing
speed being between 51 and 53 wpm?
probability =
Note: Do NOT input probability responses as
percentages; e.g., do NOT input 0.9194 as 91.94.
In: Statistics and Probability
In a comparison of the effectiveness of distance learning
with traditional classroom instruction, 12 students
took a business administration course online, while
14 students took it in a classroom. The final
scores were as follows.
Online 64 66 74 69 75 72 77 83 77
91 85 88
Classroom 80 77 74 64 71 80 68 85 83
59 55 75 81 81
Can you conclude that the mean score differs between
the two types of course
In: Statistics and Probability
A researcher was interested in the anxiety present in students just prior to the midterm exam. The research used an anxiety self-quiz to gage the student's anxiety. The score for 30 students are: 69,61,84,99.66.86.91.94,54,66,77,48, 70,70,86,98.56,43,70,88,78,53,85, 40,86,79,58,40,89,70. 1. Construct a frequency table with class, frequency, relative percent and cumulative percent that has 6 classes to describe the distribution of the data. 2. Use the frequency table to construct a histogram. 3. Calculate the numerical descriptive statistics mean, median, standard deviation, and variance of the anxiety scores. Please show all work.
In: Statistics and Probability
Some people say if you want to make money after you graduate that you should major in something \technical." A survey of 1400 recent graduates showed that students who had taken two or more classes in statistics had an average salary of $42,571 (n = 428, s = 5600) while those who hadn't taken as many statistics courses had an average salary of $38,200 (n = 972, s = 6000). Is the conventional wisdom true; should students that want to earn more consider taking statistics?
In: Math
One football player was tired of teachers and students making comments under the general assumption that student-athletes were less intelligent or inferior students to those not playing sports. To get rid of the “dumb jock” labels, he compared the results on a college readiness assessment of student-athletes and non-athletes. On this particular assessment, a student could receive the following scores: “under-prepared,” “on-track,” or “college-ready.” He recorded the following chart:
|
Under-Prepared |
College-Ready |
|
|
Athlete |
88 |
224 |
|
Non-Athlete |
127 |
300 |
In: Statistics and Probability
Consider the possibility that a faculty member wanted to survey our Research Methods class on the legalization of marijuana as being representative of the college student population. I want you to identify possible representative problems such as the class being criminal justice students and their opinions possibly being different than the college population as a whole. Additionally, the faculty member wants to survey random college students as being representative of the community at large in regards to raising the legal drinking age to 25. What biases or representative problems would exist?
In: Psychology
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 100 minutes and a standard deviation of 20 minutes. Answer the following questions.
(a) What is the probability of completing the exam in one hour or less?
(b) What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes?
(c) Assume that the class has 90 students and that the examination period is 130 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time?
In: Math
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 100 minutes and a standard deviation of 20 minutes. Answer the following questions.
(a)What is the probability of completing the exam in one hour or less?
(b) What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes?
(c) Assume that the class has 90 students and that the examination period is 130 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time
In: Math
Discuss the manifest and latent functions of education? Identify rules or regulations that some educational institutions may use to encourage students to maintain the status quo and discourage individual creativity, can you also relate? What trends in education are beneficial and which are not? (Is mandatory testing/STAR doing its job? Is bilingual education working? should students learn a language before graduating?) Consider the high school you attended, do you feel like you received a good education; did it prepare you for college?
In: Psychology