When constructing a confidence interval for a population mean, a sample of 40 observations was taken. The obtained interval was 17.25 2.42. If the sample size is 160 instead of 40, the confidence interval will be: a. 17.25 9.68 b. 69.00 9.68 c. 17.25 1.21 d. 69.00 1.21 e. 34.50 4.82

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters