The reading speed of second grade students in a large city isapproximately? normal, with a mean of 89 words per minute? (wpm)and a standard deviation of 10 wpm. A teacher instituted a newreading program at school.
After 10 weeks in the? program, it was found that the meanreading speed of a random sample of 22 second grade students was91.2 wpm. What might you conclude based on this? result?
Select the correct choice below and fill in the answer boxeswithin your choice. ?(Type integers or decimals rounded to fourdecimal places as? needed.)
A. A mean reading rate of 91.2 wpm is not unusual since theprobability of obtaining a result of 91.2 wpm or more is ____. Thismeans that we would expect a mean reading rate of 91.2 or higherfrom a population whose mean reading rate is 89 in _____ of every100 random samples of size n=22 students. The new program is notabundantly more effective than the old program.
B. A mean reading rate of 91.2 wpm is unusual since theprobability of obtaining a result of 91.2 wpm or more is ______.This means that we would expect a mean reading rate of 91.2 orhigher from a population whose mean reading rate is 89 in _____ ofevery 100 random samples of size n=22 students. The new program isabundantly more effective than the old program.
