A study by a web metrics firm Hitwise showed that in 2008 the mean time spent...
A study by a web metrics firm Hitwise showed that in 2008 the mean time spent per visit to Facebook was 19.5 minutes. A random sample of 100 Facebook users in 2015 showed a mean time per visit of 21.5 minutes with a standard deviation of 8.1 minutes. At a significance level of 0.05, can we conclude that the mean time per visit to Facebook has increased since 2008?
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A study by a web metrics firm Hitwise showed that in 2008 the
mean time spent...
these two questions go together Question 10 (0.75 points) A study showed that in a certain...
these two questions go together
Question 10 (0.75 points) A study showed that in a certain month, the mean time spent per visit to Facebook! was 19.5 minutes. Assume the standard deviation of the population is 8 minutes. Suppose that a simple random sample of 100 visits in that month has a sample mean of 21.70 minutes. A social scientist is interested in knowing whether the mean time of Facebook visits has increased. Perform the hypothesis test and compute the...
Question 11 (0.75 points) In the previous question about a study that showed that in a...
Question 11 (0.75 points) In the previous question about a study that showed that in a certain month, the mean time spent per visit to Facebook was 19.5 minutes where a social scientist is interested in knowing whether the mean time of Facebook visits has increased. Based on your P-value, what is the conclusion if we test at the 0.05 level of significance? There is evidence to conclude that the mean time of Facebook visits has not increased. There is...
Question 10 (0.75 points) A study showed that in a certain month, the mean time spent...
Question 10 (0.75 points) A study showed that in a certain month, the mean time spent per visit to Facebook was 19.5 minutes. Assume the standard deviation of the population is 8 minutes. Suppose that a simple random sample of 100 visits in that month has a sample mean of 21.13 minutes. A social scientist is interested in knowing whether the mean time of Facebook visits has increased. Perform the hypothesis test and compute the P-value. Write down your P-value....
Facebook: A study showed that two years ago, the mean time spent per visit to Facebook...
Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 19.8 minutes. Assume the standard deviation is o=10.0 minutes. Suppose that a simple random sample of 101 visits was selected this year and has a sample mean of x = 22.8 minutes. A social scientist is interested to know whether the mean time of Facebook visits has increased. Use the a=0.10 level of significance and the critical value method with the table. Part:...
ole Facebook: A study showed that two years ago, the mean time spent per visit to...
ole Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 20.2 minutes. Assume the standard deviation is o = 40 minutes. Suppose that a simple random sample of 107 visits was selected this year and has a sample mean of x = 19.2 minutes. A social scientist is interested to know whether the mean time of Facebook visits has decreased. Use the a=0.10 level of significance and the P-value method with the...
Facebook: A study showed that two years ago, the mean time spent per visit to Facebook...
Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 20.8 minutes. Assume the standard deviation is o= 8.0 minutes. Suppose that a simple random sample of 107 visits was selected this year and has a sample mean of x = 18.8 minutes. A social scientist is interested to know whether the mean time of Facebook visits has decreased. Use the a=0.10 level of significance and the P-value method with the TI-84 calculator....
The average time customers spent on the American Greetings Web site has been 11.85 minutes (Top...
The average time customers spent on the American Greetings Web site has been 11.85 minutes (Top Web Properties, USAToday, April 27, 2000). You want to show that the average time spent on that web site has now changed. Assume that the population of site visit times is normally distributed with a population standard deviation of 4.0 minutes. In order to test the hypothesis at 0.05 level of significance, the critical value(s) is(are):
A study of the time spent shopping in a supermarket for 20 specific items showed an...
A study of the time spent shopping in a supermarket for 20 specific items showed an approximately uniform distribution between 25 minutes and 45 minutes. a. What is the probability that the shopping time will be between 31 and 38 minutes? b. What is the probability that the shopping time will be less than 39 minutes? c. What are the mean and standard deviation of the shopping time?
Consider the following hypotheses: Ho: mean= 92 Hi: mean - 92 A test is performed with a sample of size 576. The sa...
Consider the following hypotheses: Ho: mean= 92 Hi: mean - 92 A test is performed with a sample of size 576. The sample mean was 85.11 and the population standard deviation is 72. Assume that the population is approximately normal. Use the TI-84 PLUS calculator to compute the P-value. Round your answer to four decimal places (for example: 0.0138). Write only a number as your answer. Your Answer: Answer Question 10 (0.75 points) A study showed that in a certain...
A study of the time spent shopping in a supermarket for 20 specific items showed an...
A study of the time spent shopping in a supermarket for 20 specific items showed an approximately uniform distribution between 10 minutes and 20 minutes. a. What is the probability that the shopping time will be between 13 and 17 minutes? b. What is the probability that the shopping time will be less than 16 minutes? c. What are the mean and standard deviation of the shopping time? . a. The probability that the shopping time will be between 13...
these two questions go together
Question 10 (0.75 points) A study showed that in a certain month, the mean time spent per visit to Facebook! was 19.5 minutes. Assume the standard deviation of the population is 8 minutes. Suppose that a simple random sample of 100 visits in that month has a sample mean of 21.70 minutes. A social scientist is interested in knowing whether the mean time of Facebook visits has increased. Perform the hypothesis test and compute the...
Question 11 (0.75 points) In the previous question about a study that showed that in a certain month, the mean time spent per visit to Facebook was 19.5 minutes where a social scientist is interested in knowing whether the mean time of Facebook visits has increased. Based on your P-value, what is the conclusion if we test at the 0.05 level of significance? There is evidence to conclude that the mean time of Facebook visits has not increased. There is...
Question 10 (0.75 points) A study showed that in a certain month, the mean time spent per visit to Facebook was 19.5 minutes. Assume the standard deviation of the population is 8 minutes. Suppose that a simple random sample of 100 visits in that month has a sample mean of 21.13 minutes. A social scientist is interested in knowing whether the mean time of Facebook visits has increased. Perform the hypothesis test and compute the P-value. Write down your P-value....
Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 19.8 minutes. Assume the standard deviation is o=10.0 minutes. Suppose that a simple random sample of 101 visits was selected this year and has a sample mean of x = 22.8 minutes. A social scientist is interested to know whether the mean time of Facebook visits has increased. Use the a=0.10 level of significance and the critical value method with the table. Part:...
ole Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 20.2 minutes. Assume the standard deviation is o = 40 minutes. Suppose that a simple random sample of 107 visits was selected this year and has a sample mean of x = 19.2 minutes. A social scientist is interested to know whether the mean time of Facebook visits has decreased. Use the a=0.10 level of significance and the P-value method with the...
Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 20.8 minutes. Assume the standard deviation is o= 8.0 minutes. Suppose that a simple random sample of 107 visits was selected this year and has a sample mean of x = 18.8 minutes. A social scientist is interested to know whether the mean time of Facebook visits has decreased. Use the a=0.10 level of significance and the P-value method with the TI-84 calculator....
A study of the time spent shopping in a supermarket for 20 specific items showed an approximately uniform distribution between 25 minutes and 45 minutes. a. What is the probability that the shopping time will be between 31 and 38 minutes? b. What is the probability that the shopping time will be less than 39 minutes? c. What are the mean and standard deviation of the shopping time?
Consider the following hypotheses: Ho: mean= 92 Hi: mean - 92 A test is performed with a sample of size 576. The sample mean was 85.11 and the population standard deviation is 72. Assume that the population is approximately normal. Use the TI-84 PLUS calculator to compute the P-value. Round your answer to four decimal places (for example: 0.0138). Write only a number as your answer. Your Answer: Answer Question 10 (0.75 points) A study showed that in a certain...
A study of the time spent shopping in a supermarket for 20 specific items showed an approximately uniform distribution between 10 minutes and 20 minutes. a. What is the probability that the shopping time will be between 13 and 17 minutes? b. What is the probability that the shopping time will be less than 16 minutes? c. What are the mean and standard deviation of the shopping time? . a. The probability that the shopping time will be between 13...
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