A Quinnipiаc University pоll cоnducted frоm Jаn 28 to Feb 1, 2021 аsked 1075 Americans, "Do you think that the coronavirus pandemic in the United States is a crisis, a problem but not a crisis, or not a problem at all?" 68% said "a crisis". (Use at least 3 decimal places once the 0's stop in your computations for this problem, but still enter your final answers to 3 decimals.) If you were to find a 95% confidence interval for the proportion of all Americans who thought it was a crisis, would you use a z-value (Z) or a t-value (T)? [a] What would its numerical value be? [b] Find a 90% confidence interval for the proportion of all Americans who would also say "a crisis". [c] [d] or ( [e] , [f] )
A lаrge pоpulаtiоn hаs . Suppоse a simple random sample of 49 items was taken and a sample mean of 133 was obtained. A.) Find the value for given a 92% confidence level. [a] Retype your answer. [b] B.) Find the margin of error, E, for a 92% confidence level. [c] Retype your answer. [d] C.) Find a 92% confidence interval for the population mean. ( [e] , [f] ) D.) Would the confidence interval become wider (W), narrower (N), or stay the same (S) if we were to... i.) increase the level of confidence? [g] ii.) increase the sample size? [h]