Among adult active Facebook users, it has been found that the average user has about 340 friends. This distribution takes only integer values
Added by Patrick F.
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Step 1: Since the average number of friends is 340, this means that the total number of friends among all users is equal to the total number of users multiplied by the average number of friends. Show more…
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Social networking: Facebook reports that the mean number of friends of adult Facebook users is 338. A test is made of H0: μ = 338 versus H1: μ ≠ 338. The null hypothesis is rejected. State an appropriate conclusion. There (Choose one) enough evidence to conclude that the mean number of friends is (Choose one) 338.
Sri K.
Among adult active Facebook users, it has been found that the average user has about 340 friends. This distribution takes only integer values, so it is certainly not normal. It is also highly skewed to the right, with a median of 200 friends. Suppose that the population standard deviation is 𝜎 = 300 and you take an SRS of 80 Facebook users. Let 𝑋𝑖 be the number of friends the 𝑖th user has on average. Then, the total number of friends in the sample of 80 users is 𝑋 = 𝑋1 + 𝑋2 + ⋯ + 𝑋80. What are the mean, 𝜇𝑋, and the standard deviation, 𝜎𝑋, of the total number of friends in the sample? Hint: Use the rules for means and variances for a sum of independent random variables. (Use decimal notation. Give your answers to two decimal places if necessary.)
Lucas F.
Facebook provides a variety of statistics on their website that detail the growth and popularity of their site. One such value is that the average user has 230 friends. If we assume that the population variance is 7225, find the probability that the average number of friends in 60 Facebook users is greater than 210.
Robin C.
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