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.
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An Internet server conducted a survey
of 400 of its customers and found that the average...
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...
The Pew Research Center Internet Project conducted a survey of 707 Internet users. This survey provided...
The Pew Research Center Internet Project conducted a survey of 707 Internet users. This survey provided a variety of statistics on them. If required, round your answers to four decimal places. 1)The sample survey showed that 90% of respondents said the Internet has been a good thing for them personally. Develop a 95% confidence interval for the proportion of respondents who say the Internet has been a good thing for them personally. 2) The sample survey showed that 67% of...
Question 4 (1 point) A survey of 500 internet users found that the users were on...
Question 4 (1 point) A survey of 500 internet users found that the users were on line an average of 6.5 hours a week with a standard deviation of 2.3 hours. If 36 internet users are randomly selected, what is the probability that their average on line time will be between 6 and 6.8 hours?
A graduate student believed that, on the average, college students spend more time on the Internet...
A graduate student believed that, on the average, college students spend more time on the Internet compared to the rest of the population. She conducted a study to determine if her hypothesis was correct. The student randomly surveyed 25 students and found that the average amount of time spent on the Internet was 8.75 hours per week with a SD = 3 hours. The last census found that, on the average, people spent 11 hour per week on the Internet....
A survey of 25 randomly selected customers found that their average age was 31.84 years with...
A survey of 25 randomly selected customers found that their average age was 31.84 years with a standard deviation of 9.84 years. What would the critical value t* be for a 95% confidence interval with 99 degrees of freedom? What would the margin of error be for a 95% confidence interval for this data (with the sample size of 25)? Construct a 95% confidence interval for the mean age of all customers for this data (with the sample size of...
An internet service provider states that the average number of hours its customers are online each...
An internet service provider states that the average number of hours its customers are online each day is 4.01. Suppose a random sample of 14 of the companys customers is selected and the average number of hours that they are online each day is measured. The sample results are shown in the accompanying table. _____________________ 3.85. 3.02. 6.16. 2.59. 3.71. 4.26. 8.07 3.63. 6.42. 1.37. 6.38. 7.89. 7.31. 1.19 _____________________ Based on the sampling of 14 customers, how much sampling...
ame: A survey conducted by Sallie Mae and Gallup of 1404 respondents found that 323 students...
ame: A survey conducted by Sallie Mae and Gallup of 1404 respondents found that 323 students paid for their education by student loans. Find the 90% confidence of the true proportion of students who paid for their education by student loans. A survey of 1898 people found that 45% of the adults said that dandelions were the toughest weeds to control in their yards. Find the 95% confidence interval of the true proportion who said that dandelions were the toughest...
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...
all answers please 3. The teachers union is concerned about the amount of time teachers spend...
all answers please
3. The teachers union is concerned about the amount of time teachers spend each week doing schoolwork at home. A simple random sample of 56 teachers had a mean of 8.0 hours per week working at home after school. Assume that the population standard deviation is 1.5 hours per week. a) Construct a 95% confidence interval estimate for the mean number of hours per week a teacher spends working at home. b) Does the confidence interval support...
8. A study conducted a few years ago claims that the adult males spend an average...
8. A study conducted a few years ago claims that the adult males spend an average of 11 hours a week watching sports on television. A recent sample of 100 adult males showed that the mean time they spend per week watching sports on television is 9.50 hours with a standard deviation of 2.2 hours. a. Use the result to give a 95% confidence interval for the mean time they spend per week watching sports on television. b. Does 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...
Question 4 (1 point) A survey of 500 internet users found that the users were on line an average of 6.5 hours a week with a standard deviation of 2.3 hours. If 36 internet users are randomly selected, what is the probability that their average on line time will be between 6 and 6.8 hours?
ame: A survey conducted by Sallie Mae and Gallup of 1404 respondents found that 323 students paid for their education by student loans. Find the 90% confidence of the true proportion of students who paid for their education by student loans. A survey of 1898 people found that 45% of the adults said that dandelions were the toughest weeds to control in their yards. Find the 95% confidence interval of the true proportion who said that dandelions were the toughest...
all answers please
3. The teachers union is concerned about the amount of time teachers spend each week doing schoolwork at home. A simple random sample of 56 teachers had a mean of 8.0 hours per week working at home after school. Assume that the population standard deviation is 1.5 hours per week. a) Construct a 95% confidence interval estimate for the mean number of hours per week a teacher spends working at home. b) Does the confidence interval support...
8. A study conducted a few years ago claims that the adult males spend an average of 11 hours a week watching sports on television. A recent sample of 100 adult males showed that the mean time they spend per week watching sports on television is 9.50 hours with a standard deviation of 2.2 hours. a. Use the result to give a 95% confidence interval for the mean time they spend per week watching sports on television. b. Does the...
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