just mark answer and do not need any explanation

Confidence level 6. Calculate the sample size that should be used in this case. Key variable Standard deviation Acceptable margin of sample error Number of visits to 25 3 the restaurant A) 11 B) 32 C) 71 D) 147 E) 267 95% F) 25,069 Confidence level 7. Calculate the sample size that should be used in this case. Key variable Standard deviation Acceptable margin of sample error Use of a 9-point 3 0.4 scale measuring intention to purchase A)50 B)114 C) 125 D) 374 E) 427 99% F)169,219 8. Last year, ABC Company conducted a mall-intercept study and found that 30% of the public had intention to purchase Product A. This year, the company wants to have a telephone survey. What sample size should be used in this year's study in order to achieve an accuracy level of 3% at the 95% level of confidence? A) 211 B) 457 C) 896 D)1,372 E)8,550 10. Compute the confidence interval in this case. Sample size Sample mean Sample Standard deviation Confidence level 400 50 25 95% What is the 95% confidence interval for the mean? A) 40.20-59.80 B) 47.55 - 52.45 C) 49.51 - 50.49 D) 49.62 - 50.38 11. Compute the confidence interval in this case. Sample size Sample percentage (p) Confidence level 100 40% 99% What is the 99% confidence interval for the mean? A) 27.36% -52.64% B) 30.40% - 49.60%) 38.74% 41.26% D) 39.60% ~ 40.40% 12. Last year, the consumer survey of ABC company showed 60% of respondents recognize the brands of ABC (n=200 respondents surveyed). The same survey is also done in this year, and it reported the percentage is 85% (n=300 respondents surveyed). With assuming this year percentage as p1 and last year percentage as p2, compute the Z-score (the formular for significance of the difference between two percentage). A) 1.54 B) 4.52 C) 6.20 D) 11.32 E) 32.73 13. The Z-score computed in question 12 shows that the difference between the two percentages is significant with a confidence level of 95 percent. A) true B) false 14. Compute the Z-score (the formular for significance of the difference between two means). Here, we assume two independent samples, samplel and sample2. Size of sample2 Mean found Mean found Standard Standard Size of in sample1 in sample2 deviation in deviation in sample 1 sample1 sample2 63 32 28 200 A)1.54 B) 3.33 C) 5.21 D) 18.09 E)27.27 75 100 15. The Z-score computed in question 14 shows that the difference between the means of the two groups is significant with a confidence level of 99 percent. A) true B) false 16. A researcher can test the null hypothesis that no differences exist between the two group means (or percentages) by using a differences test. A) true B) false