A recent research study reported that Americans spend an average of 3.6 hours on social media - per person per day. If the standard deviation for the number of hours of social media per day is 3 and a random sample of 145 Americans is selected for further study, answer the following questions about the sampling distribution:
1) The mean of this sample of n=145 belongs to a sampling distribution. What is the shape of this sampling distribution?
2) What is the mean of all the samples - the "Expected value of the Mean"?
3) What is the standard deviation of the sampling distribution?
4) If alpha = .05, and the sample mean was 4.5 hours per day of social media, was this an unusual sample - yes or no?
5) If the sample size were 50, what would the mean of the sampling distribution be?
A recent research study reported that Americans spend an average of 3.6 hours on social media...
Researchers doing a study comparing time spent on social media and time spent on studying randomly sampled 200 students at a major university. They found that students in the sample spent an average of 2.3 hours per day on social media and an average of 1.8 hours per day on studying. If all the students at the university in fact spent 2.2 hours per day on studying, with a standard deviation of 2 hours, the shape of the sampling distribution...
A random sample of 46 college students reported the number of hours per day they typically spend on social media. Their sample mean is, M = 2.61, and their standard deviation is, s = 1.02. If you plan to construct a 95% confidence interval for the population mean, what t critical value should you use based on this data?
Since everyone is staying at home, a study was done on how much time Americans are spending on the internet. The study showed that the mean time people are spending on the internet per day is 5.1 hours with a standard deviation of 1.9 hours. A random sample of 65 Americans is taken. Describe the sampling distribution of the sample mean. Group of answer choices shape: approximately normal μx¯=5.1 σx¯= 0.24 shape: exactly normal μx¯=5.1 σx¯= 0.24 shape: approximately normal...
A nationwide survey reveals that teenagers spend an average of 3 hours per day on social media with a standard deviation of 1.5 hours. What is the proportion of teenagers who spend more than 5 hours per day on social media? Group of answer choices .0918 .9082 .0951 .0085
Suppose data about the average number of hours people spend on social media websites at work is randomly collected for 5 days: 4, 4.5, 2.5, 2, 6 A.) If we assume this population is normally distributed, construct an 80% confidence interval for the population average amount of time people spend on social media websites at work. B.) Suppose I want to know more about how workers spend their time throughout the day. I want to test the claim that people...
Egyptians watch an average of 2.5 hours of television per person per day. If the standard deviation is 1.6 hours and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a sampling distribution. What is the standard deviation of this sampling distribution? o O 0.107 O 15.234 O 225 1.636
According to a recent study, the population of U.S. citizens spend, on average, 30 hours per week watching television, with a standard deviation of 5.25 hours. If a random sample of n = 36 consumers is drawn from this population, what is the probability that the sample mean will be no more than 29.3 hours per week?
Egyptians watch an average of 2.5 hours of television per person per day. If the standard deviation is 1.6 hours and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a sampling distribution. What is the mean of this sampling distribution? O 1.6 O 225 O 4.7 2.5
A random sample of 46 college students reported the number of hours per day they typically spend on social media. Their sample mean is, M = 2.61, and their standard deviation is, s = 1.02. What is the point estimate of the mean time spent per day on social media for the population of college students?
You see an article that claims that Americans spend an average of 5 hours per day watching television with a standard deviation of 1 hour. a. Draw the distribution. b. Find the probability that a randomly selected person spends between 3 and 5 hours watching television. c. Find the percentage of people who spend more than 6 hours watching television. d. If a person is in the top 2.5%, what is the minimum amount of time that the person is...