Mathematics, 19.09.2019 19:30, ghst
Psychology students at wittenberg university completed the dental anxiety scale questionnaire (psychological reports, august 1997). scores on the scale range from 0 (no anxiety) to 20 (extreme anxiety). the mean score was 11 and the standard deviation was 3.5. assume that the distribution of all scores on the dental anxiety scale is normal with μ = 11 and σ = 3.5. (a) suppose you score a 16 on the dental anxiety scale. find the z-value for this score. (b) find the probability that someone scores between a 10 and a 15 on the dental anxiety scale. (c) find the probability that someone scores above a 17 on the dental anxiety scale
Answers: 2
and standard deviation 
, the z-score of a value X is given by:
, 
.
?
and 
. The probability that someone scores between a 10 and a 15 is the difference between the pvalues of the z-value of X = 10 and X = 15.
is 0.3859.
is 0.87286.
, the pvalue is 0.95637. This means that there is a 95.637% probability that someone scores BELOW 17 on the dental anxiente scale.
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Psychology students at wittenberg university completed the dental anxiety scale questionnaire (psych...
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