V. Exercise: СНОOSE MЕ! Direction: Choose the letter of the best answer. 1. Which of the following denotes the sample size? b. s с. и d. E а. n 2. To determine the sample size it is necessary to have...

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Extracted text: V. Exercise: СНОOSE MЕ! Direction: Choose the letter of the best answer. 1. Which of the following denotes the sample size? b. s с. и d. E а. n 2. To determine the sample size it is necessary to have the value of standard deviation, Za/2 & b. margin of error c. confidence d. variance a. mean 3. As the number of sample size increases, which is NOT true? a. the margin of error decreases. b. the standard deviation increases. c. width of the confidence interval decreases d. the samples mean decreases. 4. What is the value of n if E= 5; 0 = 25 and z á/2 = 1.96? а. 90 b. 93 с. 97 d. 100 5. Which of the confidence level has a confidence interval of 2.58? a. 90% b. 95% c. 97% d. 99% 6. What is the value of n if E= 0.08; q= 0. 79 and z á/2 = 1.96? b. 100 a. 55 с. 450 d. 700 7-8. We would like to start a business and need to estimate the average possible customers in one week for our business plan and model. How many potential customers must we randomly select to be 95% sure that the sample mean is within 1 minute of the population mean u. Assume that a previous survey has shown o =6.95 minutes. а. 160 b. 168 с. 180 d. 186 9-10. Chris wants to know, with 99% confidence, the proportion of students who prefer to use smartphones. A survey showed that 95% like to use smartphones. Chris likes to be accurate within 2% of the true proportion. What sample size does Chris need? a. 251 b. 571 c.791 d. 971