Esc 2 3 4 5 678 9O 0 Q W E R T Y UO P Tab Psychology students at a university co

Question

Esc 2 3 4 5 678 9O 0 Q W E R T Y UO P Tab Psychology students at a university completed the Dental Anxiety Scale questionnaire. Scores on the scale range from (no anxiety) to 20 (extreme anxiety). The mean score was 14 and the standard deviation was 3.5. Assume that the distribution of all scores on the Dental Anxiety Scale is normal with :14 and -3.5. Complete parts a through c 3 Click here to view a table of areas under the standardized normal curve. 5. a. Suppose you score a 16 on the Dental Anxiety Scale. Find the z-value for this score. (Round to the nearest hundredth as needed.) b. Find the probability that someone scores between 13 and 18 on the Dental Anxiety Scale P(1 3 sx s 18) = Laaggel Round to four decimal places as needed.) c. Find the probability that someone scores above 17 on the Dental Anxiety Scale. P(X > 17)=1.1700 y(Round to four decimal places as needed.) 3: Table of Normal Curve Areas 20 -14 /I0-3.S 6-20 6 3.5 -Qb/10

Explanation / Answer

a) here z score =(X-mean)/std deviation =(16-14)/3.5)=0.57

b)P(13<X<18)=P(-0.2857<Z<1.1429)=0.8735-0.3875 =0.4859

c)P(X>17)=P(Z>0.8571)=0.1957

please revert for any clarification required

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