Question

One groblem wth ovningHhing baabb thal barraces a hype ofesereahure, alach themabvea to he botto of baaIwon barnacle-rablant panhave eome on the manketeach elatming to iot bamalelnfeolalon A ahing baatoner tedthe hwo branch ol palhby sainig thealdes heotherhak wthBrärndB pant. The hvosaints were theameealor At the end of the Halg zbor, the boa verealed adthe banalsarapodobardvdghedIn pounda. The967 eoniience Interval for the true mean weght of the barnala frBrand A minuthere nean wetghl hor ErandB t53,27) AmumeIndependent rändomaml were aken from populaiorn that e ormally dbblbuted. Aume eal podarlan a 4. Chooz te bot interpre乜nonbelow for tecot dene Interval in the problem. a) We ae 9 % eondent that the tue mean banale wdght for BrandA b greater than the true mean barnale wetzht tor Brard B b) We are98% eonment at there roatladealhatnla cart diferene between the true mean herndele welghie for the two painta mean barnale wetzht or Brard B d) None ol the above eoeluiorareet. 6. Ptk the founula ued tocakulate the eanlidenceinlerval aboVe e) None of the above fomula are appopriate 6. Plck theappmpiate ortvaue wed intheabove Interval a) 2146 b) 19*0 e) 2.30% d) 2.36 e) None of the above valuare eor 7. Which value l lar er, the ample mean wetght for Bad Aat e血ple mean vet thon Brand B? a) Theampleme an dro BrandBblaer. b)Ihe »kmpe meantrom Brardlaer )They are theime d) Cant arver nerha queation baaedon the Inoalon gtven

Answer 1

4) The confidence interval for difference in means is . Since the CI includes 0, We accept the null hypothesis. We are 96% confident that there is no statistically significant difference in means.

-6.3,2.7)

Correct choice is (B)

5)The formula for calculating the CI using pooled variance is $\left ( \overline{x_1} -\overline{x_2} \right )\pm z_{1-\alpha /2} \sqrt{S_p^2\left ( \frac{1}{n_1} +\frac{1}{n_2}\right )}$

Correct choice is (D)

6) The critical value is $z_{1-\alpha /2}=z_{0.98}=2.05$

Correct choice is (D)

7) The confidence interval for difference in means is . Since the CI includes 0, the means are the same.

-6.3,2.7)

Correct choice is (C)