Find the critical value z that α 2 corresponds to the confidence level 87%. Z = (Round to two decimal α 2 places as needed.) K Find the critical value za/2 that corresponds to the confidence level 87%. Za/2= (Round to two decimal places as needed.)

Find the lower bound of the confidence interval, rounding the result to four decimal places. Р(1 — р) p - E = P – Z«j2\ %3D 0.57(1 – 0.57) = 0.57 1.960 1,007 Find the upper bound of the confidence interval, rounding the result to four decimal places. P(1 — р) p + E : p + z 0.57(1 – 0.57) = 0.57 + 1.960 1,007 Therefore, a 95% confidence interval for the population proportion of adults who lack confidence they will be able to afford health insurance in the future is from a lower bound of X to an upper bound of

The owner of a currency exchange bureau on an airport wishes to estimate the mean value of cash necessary for the exchange of PLN and EUR. Experience tells the owner that the demand for euro is distributed normally, with a standard deviation equal to 4 (thousand PLN). Having observed the demand for 10 days, the owner obtained a mean of 24.4 ( thousand PLN). Calculate the realization of the confidence interval for the expected demand with a confidence level of 0.90.

Suppose that the average student buys 12 books a year. You have a theory that by offering a discount you can increase that number. You run a pilot project by offering the discount to a random sample of 25 students and you find that x = 14 and s = 4.32 State the null and alternative hypotheses Give the first symbol in the expression for Ho