Adoctor wants to estimate the mean hdl cholesterol of all 20- to 29-year-old females. how many subjects are needed to estimate the mean hdl cholesterol within 4 points with 99 % confidence assuming s equals 12.2 based on earlier studies? suppose the doctor would be content with 90 % confidence. how does the decrease in confidence affect the sample size required?
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a 99% confidence level requires
nothing subjects. (round up to the nearest subject.)

 confidence coefficient for 90% is 1.64

Step-by-step explanation:

confidence coefficient for 99% is 2.58

2.58 * 19.4/sqrt(n) = 0.04

2.598*19.4/0.04 = sqrt(n)

( 2.598*19.4/0.04)^2  = n

1587676

confidence coefficient for 90% is 1.64

is this right?

is should be y = 5x

step-by-step explanation:

correct me if im wrong

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.