a teacher instituted a new reading program at school. after 10 weeks in the prog
ID: 3056835 • Letter: A
Question
a teacher instituted a new reading program at school. after 10 weeks in the program it was found that the mean reading speed of a random sample of 18 second grade students was 93.9 won. what might you conclude based on this result. 8.1.21-T nterpnet this probability Select te correct choloe below and il in the answer box within your choloe O A H100 angles or ne 24 stdents were dosen tomtes population, we would expect sanplees) to have a sample mean rudng rate of less than 96 words per mit ndependent samples of n 24 students were chosen from this population, wo would expect 1samplels) to have a sample mean reading rate of mone than 96 wornds per minute B. 100 the sangle sizo have on Depotablity? Proide anexplanaor, fortis res A Increasng the sample see decreases to prtatity because o, decreases as rioeases c. koeasng the sample size increases tho pobabity beca se decreases as n nereases D Increasing he sample size decreases the probability because o, increases as n increases Ateacher nstued a new reading Pogram at school Aher 10 weeks ite and fill in the answer boxes within your choice n of every 100 random samples A mean reading rate of 93 9 wpm is not unususal since te probability of obtaining a resulit of 93.9 pm or mone is 093 This mathat we would expect a mean of sizen-18 students. The new program is abundantly mone effective than the old program 5 6 9 0Explanation / Answer
question:
a teacher instituted a new reading program at school. after 10 weeks in the program it was found that the mean reading speed of a random sample of 18 second grade students was 93.9 won. what might you conclude based on this result.
sol:given mean=91
compute the standar deviation when n=18
sd=10/sqrt(18)=2.357
now convert 93.9 to a z score
Z=93.9-91/2.357
Z=1.2303
The area to the right of 1.23 is 0.1093 (=NORMSDIST(-1.23)=0.1093)
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