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FOR THE NEXT FOUR QUESTIONS (QUESTIONS 8-11) USE THE FOLLOWING INFORMATION The CEO of a cosmetic company claims that 75% of her current customers are satisfied with the products they buy. To test her claim, a research group surveyed 350 customers, using simple random sampling. The results revealed that 280 customers said that they are very satisfied with the products. 8. The null hypothesis test is ) μ=0.75 B) p=0.75. C) p 0.75 D)p>0.75 9. The variance of the random sample is A) 0.160000 B) 0.021381 C) 0.012547 D) 0.000457 10. The calculated z test statistics is A) 1.628 B) 2.339 C) 109.375. D) 1.587 11. Which of the following statements is TRUE? A) B) C) The null hypothesis is not rejected at 5% level of significance The null hypothesis is not rejected at 1% level of significance The null hypothesis is rejected at 5%, but not rejected at 1% level of significance The null hypothesis is rejected at both 1% and 5% level of significance D) 12.If the p-value is greater than α in a two-tailed test, then A) the null hypothesis should be rejected B) the null hypothesis should not C) no conclusion should be made. D) a one-tailed test should be used be rejected.

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Answer #1

Step by step solution is provided in the pic attached here.

288 fh ML ワー O-2 , 2.3329 -2S8146 (2

Note that p-value is the minimum level of significance at which Ho should be rejected.

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