Could you please explain this?

Use the following for questions 6-8: Do people in different communities have different Internet usage habits? A researcher took separate random samples of people from suburban, rural, and urban communities and recorded their predominant type of Internet usage. Predominant Internet Usa ' e Total Community _-_ 98 _-_ 106 -_ 103 65 57 71 307 Total 1 l4 6. The appropriate null hypothesis for this test is (a) The number of observations in each cell is the same for rural, suburban, and urban. (b) The types of predominant Internet usage are equally likely. (c) The predominant Internet usage is dependent of the community of the person (there is an association between the variables). (d) The predominant Internet usage is independent of the community of the person (there is no association between the variables). (e) The distribution of predominant Internet usage is the same for the three communities. 7. The table shows the marginal distributions for Internet usage and community. Under the assumption that the null hypothesis is true, which of the following represents the expected count for rural dwellers who predominantly use the internet for YouTube/videos? (a) 22.66 (b) 23.82 (c) 24.51 (d) 222.42 (e) 423 .75 8. What are the degrees of freedom for the chi-square distribution in this situation? (a) 3 (b) 10 (C) 6 (d) 11 (e) 306 Era (Ergdit; Suppose that an orange grove in Redlands, CA, claims that weights of their oranges are approximately Normally distributed with a mean of 115 grams and a standard deviation of 11 grams. To test this claim, you take a random sample of 70 oranges and classify them into 4 categories: 0100 grams, 1001 15 grams, 115130 grams, and 130+ (130 or higher) grams. How many oranges should you expect in the 130+ gram category, assuming that the claim is true? (a) 6.04 (b) 8.63 (c) 11.22 (d) 17.5 (e) Not enough information