PROBABILITY
Homework Answers
= standard deviation/sqrt(n)
= 10/sqrt(144)
=10/12
= 0.8333
a group of statistics students decided to conduct a survey at their university to find the...
a group of statistics students decided to conduct a survey at their university to find the average amount of time students spend studying per week. assuming a standard deviation of 5 hours, what is the required sample size if the error is to be less than 1/2 hour with 92% level of confidence?
9. A group of statistics students decided to conduct a survey at their university to find...
9. A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a population standard deviation of three hours, what is the required sample size if the error should be less than a half hour with a 99% level of confidence? 10.University officials say that at least 70% of the voting student population supports a fee increase. If the 95% confidence interval estimating the...
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...
The Office of Student Services at a large western state university maintains information on the study...
The Office of Student Services at a large western state university maintains information on the study habits of its full-time students. Their studies indicate that the mean amount of time undergraduate students study per week is 20 hours. The hours studied follows the normal distribution with a population standard deviation of six hours. Suppose we select a random sample of 144 current students. What is the standard error of the mean?
A recent survey asked college students how much time they spend studying each week. The results...
A recent survey asked college students how much time they spend studying each week. The results showed a mean of 10 hours with a standard deviation of 2 hours. Complete parts (a) through (c) below. (a) Find the probability that a randomly selected student would spend less than 7 hours studying per week. O A. 0.933 OB. 0.500 OC. 0.067 OD. 0.333 (b) What percent of students spend more than 12 hours studying per wook? O A. 80.0% OB. 15.9%...
MUST USE EXCEL A recent study asserts that, over the past five decades, the number of...
MUST USE EXCEL
A recent study asserts that, over the past five decades, the number of hours that the average college student studies each week has been steadily dropping. In 1961, students invested 24 hours per week in their academic pursuits, whereas today's students study an average of 14 hours per week (The Boston Globe, July 4, 2010). Your aunt, Susan, happens to be the dean of a large university in California. She wonders if the study trend is reflective...
For a 4-unit class like Statistics, students should spend average of 12 hours studying for the...
For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 23 students, and the distribution of total study hours per week is bell-shaped with a mean of 13 hours and a standard deviation of 3.4 hours. Use the Empirical Rule to answer the following questions. a) 68% of the students spend between hours and hours on Statistics each week. b) 95% of the students spend between hours and...
How much do you study? A survey among freshmen at a certain university revealed that the...
How much do you study? A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 26 and standard deviation 4. Use the TI-84 PLUS calculator to answer the following. Round the answer to at least four decimal places. (a) What proportion of students studied more than 38 hours? (b) What is the probability that a randomly selected student spent between 18 and 32 hours...
a , b , and c THANK YOU !!!!! How much do you study? A survey...
a , b , and c THANK YOU !!!!!
How much do you study? A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 29 and standard deviation 9. Use the TI-84 PLUS calculator to answer the following. Round the answer to at least four decimal places. (a) What proportion of students studied more than 40 hours? (b) What is the probability that a...
A student believed that students in a Health Sciences program at his college studied, on average,...
A student believed that students in a Health Sciences program at his college studied, on average, more than students in other programs. He decided to assess whether this was true by collecting data on the typical number of hours per week that students studied during the semester. He collected data from a random sample of students. The table below summarizes the results. Sample Standard Deviation n Sample Mean Health Sciences 42 24.3 5.65 Other Programs 35 22.0 8.35 What is...
A recent survey asked college students how much time they spend studying each week. The results showed a mean of 10 hours with a standard deviation of 2 hours. Complete parts (a) through (c) below. (a) Find the probability that a randomly selected student would spend less than 7 hours studying per week. O A. 0.933 OB. 0.500 OC. 0.067 OD. 0.333 (b) What percent of students spend more than 12 hours studying per wook? O A. 80.0% OB. 15.9%...
MUST USE EXCEL
A recent study asserts that, over the past five decades, the number of hours that the average college student studies each week has been steadily dropping. In 1961, students invested 24 hours per week in their academic pursuits, whereas today's students study an average of 14 hours per week (The Boston Globe, July 4, 2010). Your aunt, Susan, happens to be the dean of a large university in California. She wonders if the study trend is reflective...
For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 23 students, and the distribution of total study hours per week is bell-shaped with a mean of 13 hours and a standard deviation of 3.4 hours. Use the Empirical Rule to answer the following questions. a) 68% of the students spend between hours and hours on Statistics each week. b) 95% of the students spend between hours and...
How much do you study? A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 26 and standard deviation 4. Use the TI-84 PLUS calculator to answer the following. Round the answer to at least four decimal places. (a) What proportion of students studied more than 38 hours? (b) What is the probability that a randomly selected student spent between 18 and 32 hours...
a , b , and c THANK YOU !!!!!
How much do you study? A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 29 and standard deviation 9. Use the TI-84 PLUS calculator to answer the following. Round the answer to at least four decimal places. (a) What proportion of students studied more than 40 hours? (b) What is the probability that a...
A student believed that students in a Health Sciences program at his college studied, on average, more than students in other programs. He decided to assess whether this was true by collecting data on the typical number of hours per week that students studied during the semester. He collected data from a random sample of students. The table below summarizes the results. Sample Standard Deviation n Sample Mean Health Sciences 42 24.3 5.65 Other Programs 35 22.0 8.35 What is...
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