1Which of the following statements are correct concerning a 95% condent interval? a} There is a 0.05 probabilityr the population parameter of interest is not contained within the interval. b} There is a 0.95 probabilitv that the population parameter of interest is contained within the interval. c] In computing condence intervals from 20 samples, 19' of the intervals would contain the population mean. d} If vou were to produce all possible condence intervals using the sample mean of each sample of a given size from the population, then |35% of the intervals would contain the population mean. Acondence interval was used to estimate the proportion of government emplovees who are part of H RA random sample of T2 emplovees generated the following 90% condence interval: {0.433. 0642]. What total size sample would be necessarv it we wanted to estimate the true proportion to within 0.03 using |35% condence? a} 105 b} 150 c1420 d} 59'? The .Iiger'lciur Supervisor wants to know the 66 levels of incomes with the protection division. The populaon standard deviation is known to be $1000. A random sample of 50 individuals resulted in a mean income of $13000- What is the width of the 90% condence interval? a} $232.60 b} $364.30 c] $465.23 cl} $93.60 In the construction of condence intervals, it all other quantities are unchangedr an increase in the sample size will lead to what change in the interval? a} narrower b} wider c] less signicant dl biased