Question

The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures students' study habits and attitude toward school. The survey yields several scores, one of which measures student attitudes toward studying. The mean student attitude score for college students is about 50, and the standard deviation is about 15. A researcher in the Philippines is concerned about the declining performance of college graduates on professional licensure and board exams. She suspects that poor attitudes of students are partly responsible for the decline and that the mean for college seniors who plan to take professional licensure or board exams is less than 50. She gives the SSHA to an SRS of 225 college seniors in the Philippines who plan to take professional licensure or board exams. Suppose we know that the student attitude scores in the population of such students are Normally distributed with standard deviation σ = 15. (Use a left-tailed test.)

(a) One sample of 225 students had mean student attitude score x
= 48.7.Enter this x, along with the other required information,
into the *P*-Value of a Test of Significance Applet.What is
the *P*-value? (Round your answer to four decimal
places.)

*P*-value =

(b) Another sample of 225 students had x = 47.4. Use the applet
to find the *P*-value for this outcome. (Round your answer
to four decimal places.)

*P*-value =

Answer #1

SolutionA:

σ = 15

n=225

xbar=48.7

Ho:mu=50

Ha:mu<50

using ti83 cal

p=0.0968

p=0.0968

Solution-b:

xbar=47.4

p=0.0047

p value=0.0047

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