5) (8 points) Of 142 randomly selected adults, 33 were found to have high blood pressure. a) Construct a 95% confidence

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5 8 Points Of 142 Randomly Selected Adults 33 Were Found To Have High Blood Pressure A Construct A 95 Confidence 1 (49.9 KiB) Viewed 30 times

5 8 Points Of 142 Randomly Selected Adults 33 Were Found To Have High Blood Pressure A Construct A 95 Confidence 2 (56.88 KiB) Viewed 30 times

5) (8 points) Of 142 randomly selected adults, 33 were found to have high blood pressure. a) Construct a 95% confidence interval for the true percentage of all adults that have high blood pressure. b) Would it be accurate to say that at least 25% of all adults have high blood pressure? 1 (yes or no) Hint: The next two questions are asking you to find minimum sample size to estimate population proportion. Make sure to use the appropriate formula for each. Ask yourself: Is the sample proportion provided? 6) A newspaper article about the results of a poll states: "In theory, we should be 99% confident that the results of such a poll should differ by no more than 3 percentage points in either direction from what would have been obtained by interviewing all voters in the United States." Find the sample size suggested by this statement. 7) The CEO of Computers, Inc., wants to estimate the proportion of U.S. families that have at least one laptop computer. From last year's study, it was determined that 74% have a laptop. What minimum sample size is required if the CEO wants no more than a 3.5% margin of error and wants the estimate to be 90% accurate. 8) Express the confidence interval (0.556, 0.706) in the form of p t E.

9) The amounts (in ounces) of juice in eight randomly selected juice bottles are: 15.2 15.0 15.3 15.1 15.8 15.3 15.4 15.7 a) Construct a 98% confidence interval for the mean amount of juice in all such bottles. Assume the population of values has a normal distribution. You may obtain the sample mean and standard deviation from 1- VarStats, b) Write a statement describing your results. Include all four necessary elements. 10) Find the critical value zex/2 that corresponds to a 98% confidence level. Choose correct answer. A) 2.575 B) 2.33 C) 2.05 D) 1.75 Begin using calculator functions (where possible) here. Write calculator function used and any inputs before answering. 11) Of 380 randomly selected medical students, 21 said that they planned to work in a rural community. Choose the 95% confidence interval for the true proportion of all medical students who plan to work in a rural community. A) 0.0280 <p<0.0826 B) 0.0360 <p<0.0745 D) 0.0251 < p <0.0854 C) 0.0323<p<0.0782 12) Do one of the following, as appropriate: (a) Find the critical value Zex/2, (b) find the critical value tcx/2- C-Level is 99%; n = 17; a is unknown; population appears to be normally distributed. Which one applies? B) Zc/2=2.583 A) Zc/2=2.567 D) tc/2 = 2.921 Ⓒtc/2=2.898 2