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bai 1.By how much should the sample size of each of the two groupsin problem 7.11 be increased in order that the observed of 0.7 inch in the meanheights be significant at the level of significance (a) 0.05, (b) 0.01?bài 2.Two groups, A and B, each consist of 100 people who have a disease. A serum is given to Group A but not to Group B (which is called the control group); otherwise, the tow groups are treated identically. Test the hypothesis that the serum helps to cure the disease using a level of significance of (a) 0.01, (b) 0.05, (c) 0.10. (d) Find the P vlue of the test
bài 3.Work problem 7.13 if each group consists of 300 people and if 225 people in Group A and 195 people in Group B are cured.
bài 4.A sample poll of 300 voters from district A and 200 voters from district B showed that 56% and 48%, respectively,were in favor of a given candidate. At a level of significance of 0.05, test the hypothesis that (a) there is difference between the districts, (b) the candidate is preferred in district A. (c) Find the respective P values of the test.
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bai 1.By how much should the sample size of each of the two groupsin problem 7.11 be increased in order that the observed of 0.7 inch in the meanheights be significant at the level of significance (a) 0.05, (b) 0.01?bài 2.Two groups, A and B, each consist of 100 people who have a disease. A serum is given to Group A but not to Group B (which is called the control group); otherwise, the tow groups are treated identically. Test the hypothesis that the serum helps to cure the disease using a level of significance of (a) 0.01, (b) 0.05, (c) 0.10. (d) Find the P vlue of the test
bài 3.Work problem 7.13 if each group consists of 300 people and if 225 people in Group A and 195 people in Group B are cured.
bài 4.A sample poll of 300 voters from district A and 200 voters from district B showed that 56% and 48%, respectively,were in favor of a given candidate. At a level of significance of 0.05, test the hypothesis that (a) there is difference between the districts, (b) the candidate is preferred in district A. (c) Find the respective P values of the test.
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