MATH 1127 Online Spring 2018 kayla Coker3125118 1:43 PM Homework: HW #6 ( Ch 8)

Question

MATH 1127 Online Spring 2018 kayla Coker3125118 1:43 PM Homework: HW #6 ( Ch 8) HW Score: 35.76%, 7.87 of 22 pts score: 0.6 of 1 pt 8.1.21 e re o ng speed o 401 9 (9 complete) Question Help second grade students n a large cty approximately normal with a mean of 88 v rds per m nute pm) and a standard dev a on of 10 wpm Com ele parts (a) th igh O c. Increasing the sample sze decreases the probab lity because x increases as n ncreases D. Increasing the sample size decreases the probability because o, decreases as n increases (e) A teacher nstituted 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 20 second grade students was 90 4 wpm What might you conclude based on this result? Select the corect choice and fill in the answer box in your choice below Round to four decimal places as needed) O A A mean reading rate of 90 4 wpm is not unusual since the probability of oblaining a result of 90 4 wpm or more is The new program is not abundantly more offective than the old program O8 A mean reading rate of 90 4 wpm is unusual since the probability of obtaining a result of 90 4 wpm or more is The new program is abundantly more efective than the old program oiok to seleot and enter your answers) and then click Check Answer Clear All

Explanation / Answer

Ans:

e)

sample size,n=20

sample mean=90.4

z=(90.4-88)/(10/sqrt(20))

z=1.073

P(z>=1.073)=0.1416

Option A is correct.

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