According to a marketing website, adults in a certain country average 55 minutes per day on...
According to a marketing website, adults in a certain country average 55 minutes per day on mobile devices this year. Assume that minutes per day on mobile devices follow the normal distribution and has a standard deviation of 10 minutes. What amount of time spent today on mobile devices by an adult represents the 64 th percentile?
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According to a marketing website, adults in a certain country
average 55 minutes per day on...
According to eMarketer, adults in the U.S. average 210 minutes per day on mobile devices. Assume...
According to eMarketer, adults in the U.S. average 210 minutes per day on mobile devices. Assume that minutes per day on mobile devices follow a normal distribution with a mean of 210 minutes and standard deviation of 60 minutes. (a) What percentage of adults spend more than 3 hours (180 minutes) on their mobile devices per day? (b) What percentage of adults spend between 120 and 300, minutes on their mobile devices per day?
The answers are in red. Please answer all. I have a hard time understanding when to...
The answers are in red. Please
answer all. I have a hard time understanding when to use the
table
According to eMarketer, adults in the United States spent an average of 92 minutes per day on social media platforms Facebook, Snapchat, and Instagram in 2017. Assume that minutes per day on these platforms follow a normal distribution with a standard deviation of 29. Complete parts a through d. Click here to view page 1 of the standard normal distribution table....
) According to a certain survey, adults spend 2.252.25 hours per day watching television on a...
) According to a certain survey, adults spend 2.252.25 hours per day watching television on a weekday. Assume that the standard deviation for "time spent watching television on a weekday" is 1.931.93 hours. If a random sample of 6060 adults is obtained, describe the sampling distribution of x overbarx, the mean amount of time spent watching television on a weekday. x overbarx is approximately normal with mu Subscript x overbarμxequals= 2.25 and sigma Subscript x overbarσxequals=0.2491620.249162 . (Round to six...
According to a social media blog, time spent on a certain social networking website has a...
According to a social media blog, time spent on a certain social networking website has a mean of 22 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed and that the standard deviation is 55 minutes. Complete parts (a) through (d) below. a. If you select a random sample of 16 sessions, what is the probability that the sample mean is between 21.5 and 22.5 minutes?
According to a certain survey, adults spend 2.35 hours per day watching television on a weekday....
According to a certain survey, adults spend 2.35 hours per day watching television on a weekday. Assume that the standard deviation for "time spent watching television on a weekday" is 1.93 hours. If a random sample of 50 adults is obtained, describe the sampling distribution of x overbar, the mean amount of time spent watching television on a weekday. One consequence of the popularity of the Internet is that it is thought to reduce television watching. Suppose that a random...
Question 5 An carlier study claimed that U.S adults spent an average of 114 minutes per...
Question 5 An carlier study claimed that U.S adults spent an average of 114 minutes per day with their family. A recently raken sample of 25 adults from a city show'eod that they spend an average of 109 minutes per day with their family, Ihe population deviation is I1 minutes. Assume that the times spent by adults with their families have an approximate normal distribution Using a 1% significance level test whether the mean time spent currently by all adults...
According to a social media blog, time spent on a certain social networking website has a...
According to a social media blog, time spent on a certain social networking website has a mean of 24 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed and that the standard deviation is 7 minutes. If you select a random sample of 36 sessions, what is the probability that the sample mean is between 23.5 and 24.5 minutes?
According to a social media blog, time spent on a certain social networking website has a...
According to a social media blog, time spent on a certain social networking website has a mean of 16 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed and that the standard deviation is 5 minutes. If you select a random sample of 144 sessions, what is the probability that the sample mean is between 15.5 and 16.5 minutes?
The following data show the number of hours per day 12 adults spent in front of...
The following data show the number of hours per day 12 adults spent in front of screens watchin 4.3 4.5 7.4 1.3 5.7 4.6 3.4 7.9 2.2 5.1 1.7 8.3 a. Construct a 99% confidence interval to estimate the average number of hours per day adults s The 99% confidence interval to estimate the average number of hours per day adults spend (Round to two decimal places as needed.) b. What assumptions need to be made about this population? O...
According to a social media blog, time spent on a certain social networking website has a...
According to a social media blog, time spent on a certain social networking website has a mean of 20 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed and that the standard deviation is 7 minutes. Complete parts (a) through (d) below. a. If you select a random sample of 25 sessions, what is the probability that the sample mean is between 19.5 and 20.5 minutes? (Round to three decimal places as...
The answers are in red. Please
answer all. I have a hard time understanding when to use the
table
According to eMarketer, adults in the United States spent an average of 92 minutes per day on social media platforms Facebook, Snapchat, and Instagram in 2017. Assume that minutes per day on these platforms follow a normal distribution with a standard deviation of 29. Complete parts a through d. Click here to view page 1 of the standard normal distribution table....
Question 5 An carlier study claimed that U.S adults spent an average of 114 minutes per day with their family. A recently raken sample of 25 adults from a city show'eod that they spend an average of 109 minutes per day with their family, Ihe population deviation is I1 minutes. Assume that the times spent by adults with their families have an approximate normal distribution Using a 1% significance level test whether the mean time spent currently by all adults...
The following data show the number of hours per day 12 adults spent in front of screens watchin 4.3 4.5 7.4 1.3 5.7 4.6 3.4 7.9 2.2 5.1 1.7 8.3 a. Construct a 99% confidence interval to estimate the average number of hours per day adults s The 99% confidence interval to estimate the average number of hours per day adults spend (Round to two decimal places as needed.) b. What assumptions need to be made about this population? O...
According to a social media blog, time spent on a certain social networking website has a mean of 20 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed and that the standard deviation is 7 minutes. Complete parts (a) through (d) below. a. If you select a random sample of 25 sessions, what is the probability that the sample mean is between 19.5 and 20.5 minutes? (Round to three decimal places as...
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