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Question 4 (1 point) A survey of 500 internet users found that the users were on...
An Internet server conducted a survey of 400 of its customers and found that the average...
An Internet server conducted a survey of 400 of its customers and found that the average amount of time spent online was 12.5 hours per week with a standard deviation of 5.4 hours. a. Construct a 95% confidence interval for the average online time for all users of the particular Internet server. b. If the Internet server claimed that its users averaged 15 hours of use per week, would you agree or disagree? Explain.
12. An Internet server conducted a survey of 400 of its customers and found that the...
12. An Internet server conducted a survey of 400 of its customers and found that the average amount of time spent online was 12.5 hours per week with a standard deviation of 5.4 hours. What shape do you think the random variable x, the number of hours spent online, has? If the distribution of the original measurements is not normal, you can still use the standard normal distribution to construct a confidence interval for 4, the average online time for...
U.S. internet users spend an average of 18.3 hours a week online. If 99% of users...
U.S. internet users spend an average of 18.3 hours a week online. If 99% of users spend between 13.2 and 23.4 hours a week, what is the probability that a randomly selected user is online less than 14 hours a week? Assume that internet usage follows a normal distribution. Round the final answer to four decimal places and intermediate z value calculations to two decimal places. The probability of a randomly selected person being online less that 14 hours per...
Question 8 (1 point) A survey among freshmen at a certain university revealed that the number...
Question 8 (1 point) 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 25 and standard deviation 15. A sample of 36 students was selected. What is the probability that the average time spent studying for the sample was between 28.7 and 30 hours studying? Write only a number as your answer. Round to 4 decimal places (for example 0.0048). Do not write...
Question 6 (1 point) A survey among freshmen at a certain university revealed that the number...
Question 6 (1 point) 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 25 and standard deviation 7 What is the probability that a randomly selected student spent between 26 and 40 hours studying? Write only a number as your answer. Round to 4 decimal places (for example 0.0048). Do not write as a percentage. Your Answer: Answer Question 7 (1.2 points) The...
The time college students spend on the internet follows a Normal distribution. At Johnson University, the...
The time college students spend on the internet follows a Normal distribution. At Johnson University, the mean time is 6 hours per day with a standard deviation of 1.5 hours per day. If 100 Johnson University students are randomly selected, what is the probability that the average time spent on the internet will be more than 6.2 hours per day? ____________ Round to 4 places. If 100 Johnson University students are randomly selected, what is the probability that the average...
(1) A survey found that the American family generates an average of 17.2 pounds of glass...
(1) A survey found that the American family generates an average of 17.2 pounds of glass garbage each year. Assume that standard deviation of the distribution is 2.5 pounds. Find the probability that the mean of a sample of 55 families will be between more than 18 pounds. Assume that the sample is taken from a population normally distributed. (2) The average weight of 40 randomly selected minivans was 4150 pounds. The population standard deviation was 480. Find the 99%...
A student at a junior college conducted a survey of 20 randomly selected full-time students to...
A student at a junior college conducted a survey of 20 randomly selected full-time students to determine the relation between the number of hours of video game playing each week, x, and grade-point average, y. She found that a linear relation exists between the two variables. The least-squares regression line that describes this relation is y = -0.0516x + 2.9389 (a) Predict the grade-point average of a student who plays video games 8 hours per week. The predicted grade-point average...
In a study of computer use, 1000 randomly selected Canadian Internet users were asked how much...
In a study of computer use, 1000 randomly selected Canadian Internet users were asked how much time they spend using the Internet in a typical week. The mean of the sample observations was 12.8 hours. (a) The sample standard deviation was not reported, but suppose that it was 6 hours. Carry out a hypothesis test with a significance level of 0.05 to decide if there is convincing evidence that the mean time spent using the Internet by Canadians is greater...
Data from a survey of 500 randomly selected employee found a mean age of 56.98 years...
Data from a survey of 500 randomly selected employee found a mean age of 56.98 years and the standard deviation was 7.83 years. What is the standard error of the mean?
12. An Internet server conducted a survey of 400 of its customers and found that the average amount of time spent online was 12.5 hours per week with a standard deviation of 5.4 hours. What shape do you think the random variable x, the number of hours spent online, has? If the distribution of the original measurements is not normal, you can still use the standard normal distribution to construct a confidence interval for 4, the average online time for...
Question 8 (1 point) 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 25 and standard deviation 15. A sample of 36 students was selected. What is the probability that the average time spent studying for the sample was between 28.7 and 30 hours studying? Write only a number as your answer. Round to 4 decimal places (for example 0.0048). Do not write...
Question 6 (1 point) 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 25 and standard deviation 7 What is the probability that a randomly selected student spent between 26 and 40 hours studying? Write only a number as your answer. Round to 4 decimal places (for example 0.0048). Do not write as a percentage. Your Answer: Answer Question 7 (1.2 points) The...
In a study of computer use, 1000 randomly selected Canadian Internet users were asked how much time they spend using the Internet in a typical week. The mean of the sample observations was 12.8 hours. (a) The sample standard deviation was not reported, but suppose that it was 6 hours. Carry out a hypothesis test with a significance level of 0.05 to decide if there is convincing evidence that the mean time spent using the Internet by Canadians is greater...
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