Let X be the number of students absent from a randomly chosen class on any give day. The standard deviation of X is 1.15. If many classes were selected at random, which of the following would be the best interpretation of the value 1.15? a) The mean number of absences would be about 1.15 b) The number of absences would be at most 1.15 from the mean c) The number of absences would typically be about 1.15 from the mean d) The mean number of absences would be about 1.15 from the expected value e) The number of absences would be within 1.15 from the mean about 68% of the time

Timed***how else can the sequence for row 1 be written? notice: square a: 1 penny = 20 square b: 2 pennies = 21 square c: 4 pennies = 22 the sequence formed is geometric, with a1 = , and common ratio r = .

Which shaded region is the solution to the system of inequalities? y y[tex]\geq[/tex]-x+1

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect