Project #84226 - statistics

5.14 For the normal distribution times of electric light bulbs, with the mean equal to 1,200 hours and standard deviation equal to 120 hours, what burning time identified with the.

a) upper 50 percent

 

 

b)lower 75 percent

 

 

c) lower 1 percent

 

 

d) middle 90 percent?

 

6.9 Indicate whether the following generalizations suggest a positive or negative relationship.Also speculate about or not these generalization reflect simple cause-effect relationsships.

 

a) Preschool children who delay gratification (posponing eating one marshmallow to win two) subsequently receive higher evaluations of adolecent competencies.

b)college student who take longer to finish mor poorly on that test.

c)Heavy smokers have shoter life expectancies.

d)Infants who experince longer durations of breast feeding score higher on IQ test in later childhood.

PLEASE I WANT THE STEPS TO LEARN THE EQUATION

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Due By (Pacific Time) 09/29/2015 12:30pm
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