An exhaustive study of all active Facebook accounts was recently conducted by Facebook. One variable Facebook...
An exhaustive study of all active Facebook accounts was recently conducted by Facebook. One variable Facebook recorded was the number of friends X of each Facebook user. Suppose X has expected value E(X) = 200 and standard deviation SD(X) = 289.4. Since the possible values of X are only integers and since the distribution of X is highly skewed to the right, the distribution of X cannot be described by a normal model. Suppose you select a random sample of...
An exhaustive study of all active Facebook accounts was recently conducted by Facebook. One variable Facebook recorded was the number of friends X of each Facebook user. Suppose X has expected value E(X) = 198 and standard deviation SD(X) = 281.5. Since the possible values of X are only integers and since the distribution of X is highly skewed to the right, the distribution of X cannot be described by a normal model. Suppose you select a random sample of...
It is reported† that the average or mean number of Facebook friends is 155. Suppose that when 50 randomly chosen Facebook users are polled regarding the number of their friends, the average number of their friends was reported to be x = 148 with a standard deviation of s = 29.5. Calculate the value of the z-statistic based on the sample mean, x. (Round your answer to two decimal places.) z =
Suppose that the average number of Facebook friends users have is normally distributed with a mean of 136 and a standard deviation of about 44. Assume eight individuals are randomly chosen. Answer the following questions. Round all answers to 4 decimal places where possible. What is the distribution of ¯x? ¯x ~ N For the group of 8, find the probability that the average number of friends is less than 143 Find the first quartile for the average number of...
Suppose that the average number of Facebook friends users have is normally distributed with a mean of 143 and a standard deviation of about 49. Assume forty-eight individuals are randomly chosen. Answer the following questions. Round all answers to 4 decimal places where possible. What is the distribution of ¯ x ? ¯ x ~ N( , ) For the group of 48, find the probability that the average number of friends is less than 146. Find the third quartile...
Suppose that the average number of Facebook friends users have is normally distributed with a mean of 146 and a standard deviation of about 55. Assume seven individuals are randomly chosen. Answer the following questions. Rourd all answers to 4 decimal places where possible. a. What is the distribution of 2? 655 b. For the group of 7, find the probability that the average number of friends is more than 158. c. Find the third quartile for the average number...
III Suppose that the average number of Facebook friends users have is normally distributed with a mean of 146 and a standard deviation of about 56. Assume thirteen individuals are randomly chosen. Answer the following questions. Round all answers to 4 decimal places where possible. a. What is the distribution of a? - NGI b. For the group of 13, find the probability that the average number of friends is less than 125. c. Find the first quartile for the...
Suppose that the average number of Facebook friends users have is normally distributed with a mean of 111 and a standard deviation of about 45. Assume fourteen individuals are randomly chosen. Answer the following questions. Round all answers to 4 decimal places where possible.What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)For the group of 14, find the probability that the average number of friends is less than 106. Find the third quartile for the average number of Facebook friends. For part b), is the...
A random sample of size 32 is to be selected from a population that has a mean μ = 48 and a standard deviation σ of 13. (a) This sample of 32 has a mean value of x, which belongs to a sampling distribution. Find the shape of this sampling distribution. skewed right approximately normal skewed left chi-square (b) Find the mean of this sampling distribution. (Give your answer correct to nearest whole number.) (c) Find the standard error of...
A random sample of size 39 is to be selected from a population that has a mean μ = 53 and a standard deviation σ of 15. (a) This sample of 39 has a mean value of x, which belongs to a sampling distribution. Find the shape of this sampling distribution. -skewed right -approximately normal -skewed left -chi-square (b) Find the mean of this sampling distribution. (Give your answer correct to nearest whole number.) (c) Find the standard error of...