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November 21, 2014

Homework Help: Prob ans stat

Posted by Hannah on Friday, July 29, 2011 at 12:19pm.

Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson's psychology class. After interviewing many students, it was found that x has an approximately normal distribution with mean of 5.2 hours and standard deviation of 1.8 hours. Convert the x interval x> 9.7, to a standard z interval.
a. z < 2.5
b. z < 2.5
c. z > 2.5
d. z > -2.5
I think its C. is this correct ?
34 minutes ago - 4 days left to answer.
Additional Details
Using the information from problem #3, convert the z interval -1.5 < z < 1 to a raw score .

a. 2.5 < x < 7
b. 3.44 < x < 6.66
c. 3.7< x < 12.2
d. -3.7 < x< -2.3

is is A ?

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