from prior experience we know time spent studying for an exam is approximately normally distributed.You survey...
from prior experience we know time spent studying for an exam is approximately normally distributed.You survey HC students and ask the participating students how many times do they spend studying for the exam. From your sample of 36 HC students ,you obtained the mean time spent to study for an exam was 160 minutes,with standard deviation of 40 mins.
2)construct a 95% confidence interval for the mean study time (in minutes) of HC students.
Homework Answers
Add Answer to:
from prior experience we know time spent studying for an exam is
approximately normally distributed.You survey...
In a study of academic procrastination, the authors of a paper reported that for a sample...
In a study of academic procrastination, the authors of a paper reported that for a sample of 441 undergraduate students at a midsize public university preparing for a final exam in an introductory psychology course, the mean time spent studying for the exam was 7.64 hours and the standard deviation of study times was 3.50 hours. For purposes of this exercise, assume that it is reasonable to regard this sample as representative of students taking introductory psychology at this university....
In a study of academic procrastination, the authors of a paper reported that for a sample...
In a study of academic procrastination, the authors of a paper reported that for a sample of 431 undergraduate students at a midsize public university preparing for a final exam in an introductory psychology course, the mean time spent studying for the exam was 7.34 hours and the standard deviation of study times was 3.40 hours. For purposes of this exercise, assume that it is reasonable to regard this sample as representative of students taking introductory psychology at this university....
Example: The time to complete a standardized exam is approximately normal with a mean of 70...
Example: The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. Using the 68-95-99.7 rule, a) what percentage of students will complete the exam in under an hour? b) what percentage of students will complete the exam between 60 minutes and 70 minutes? 17 of 27 c) in what time interval would you expect the central 95% of students to be found?
Based on experience, the time required to complete a college statistics exam is normally distributed with...
Based on experience, the time required to complete a college statistics exam is normally distributed with a mean of 42 minutes and a standard deviation of 8 minutes. The class is a large lecture and has 900 students. Simulate the exam completion times for the 900 students. (Convert to a percent then round to two decimals) a) What percent of students are still working when the professor stops the exam at 50 minutes? % b) What percent of students are...
Suppose a survey of 36 people determined that the sample mean time spent on the internet...
Suppose a survey of 36 people determined that the sample mean time spent on the internet was 8.2 hours with a sample standard deviation of 9.8 hours. What is the critical value for a 95% confidence interval? Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 7 is entered as 7.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38 | | Suppose a survey of 36 people determined that the sample...
1) A professor knows that in the past, the average amount of time spent studying the...
1) A professor knows that in the past, the average amount of time spent studying the night before the first exam was 140 minutes with a normal distribution and a standard deviation of 75.1. The professor finds that the average amount of time spent studying the night before the first exam for the current class of 40 students is 165 minutes. a) Please identify the following values from the above study description. The population mean (ยต) equals ________________. The population...
8. Fast food restaurants spend quite a bit of time studying the time spent in drive...
8. Fast food restaurants spend quite a bit of time studying the time spent in drive through. For a drive-through restaurant it was found that the waiting time is normally distributed with a mean 138.5 seconds and standard deviation of 29 seconds. a) What is the probability that a randomly selected car will et through the drive less than 100 seconds? What is the probability that a randomly selected car will spend at least 160 seconds? What is the probability...
Question 13 options: Suppose a survey of 36 people determined that the sample mean time spent...
Question 13 options: Suppose a survey of 36 people determined that the sample mean time spent on the internet was 8.2 hours with a sample standard deviation of 9.8 hours. What is the critical value for a 95% confidence interval? Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 7 is entered as 7.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38 | | Suppose a survey of 36 people determined...
1. To determine the average number of hours spent studying by college students per week, a...
1. To determine the average number of hours spent studying by college students per week, a sample of 39 students was randomly selected, and found to spend an average of 17.1 hours per week, with a standard deviation of 4.3 hours. Find the 90% confidence interval for the mean number of hours spent studying per week by all college students. What is the upper and lower bound? 2. If I asked a random student how many hours they study per...
13 . According to the American Time Use Survey, the typical American spends 154.8 minutes per...
13 . According to the American Time Use Survey, the typical American spends 154.8 minutes per day watching television. A survey of 50 Internet users results in a mean time watching television per day of 128.7 minutes, with a standard deviation of 46.5 minutes. Using 0.05 level of significance to test the claim that Internet users spend less time watching television. 14. College math instructors suggest that students spend 2 hours outside class studying for every hour in class. So,...
In a study of academic procrastination, the authors of a paper reported that for a sample of 441 undergraduate students at a midsize public university preparing for a final exam in an introductory psychology course, the mean time spent studying for the exam was 7.64 hours and the standard deviation of study times was 3.50 hours. For purposes of this exercise, assume that it is reasonable to regard this sample as representative of students taking introductory psychology at this university....
Example: The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. Using the 68-95-99.7 rule, a) what percentage of students will complete the exam in under an hour? b) what percentage of students will complete the exam between 60 minutes and 70 minutes? 17 of 27 c) in what time interval would you expect the central 95% of students to be found?
Based on experience, the time required to complete a college statistics exam is normally distributed with a mean of 42 minutes and a standard deviation of 8 minutes. The class is a large lecture and has 900 students. Simulate the exam completion times for the 900 students. (Convert to a percent then round to two decimals) a) What percent of students are still working when the professor stops the exam at 50 minutes? % b) What percent of students are...
8. Fast food restaurants spend quite a bit of time studying the time spent in drive through. For a drive-through restaurant it was found that the waiting time is normally distributed with a mean 138.5 seconds and standard deviation of 29 seconds. a) What is the probability that a randomly selected car will et through the drive less than 100 seconds? What is the probability that a randomly selected car will spend at least 160 seconds? What is the probability...
Most questions answered within 3 hours.
-
An ANOVA comparing two groups is equivalent to an independent
samples t-test.
True
False
asked 10 minutes ago -
Some supermarkets are using customer tracking technology that
traces the flow of customers
through the shop....
asked 1 minute ago -
A dock worker applies a constant horizontal force of 75.0 N to a
block of ice...
asked 10 minutes ago -
You are the CEO of a major corporation whose databases were
recently hacked, and sensitive customer...
asked 15 minutes ago -
Amazon is not just a
surviving company of the 1990s tech boom; it is now one...
asked 13 minutes ago -
Q1b. Provide an example of how pricing should interact
with the services offered by the retailer.
asked 42 minutes ago -
a mass weighing 8 pounds when attached to a spring, stretches
it 6 inches.the object is...
asked 49 minutes ago -
The following is part of the computer output from a regression
of monthly returns on Waterworks...
asked 54 minutes ago -
Bob Katz is purchasing a new Honda Pilot for $35,000. He is
financing $30,000 with a...
asked 57 minutes ago -
The equity holders of Super Nova, Inc. have 100 million of
equity in the firm. Because...
asked 56 minutes ago -
A sample of 240 observations is selected from a normal
population with a population standard deviation...
asked 1 hour ago -
Write an (efficient) pseudocode for the implementation of each
of the following function prototypes (proper C...
asked 1 hour ago