252y0421
... Make a diagram! For z draw a Normal curve with zero in the middle. Shade the area between -3.32 and 0.22 and note that it is all on one side of the mean, so that you subtract the area between -0.22 and zero from the area between -3.32 and zero. ...
... Make a diagram! For z draw a Normal curve with zero in the middle. Shade the area between -3.32 and 0.22 and note that it is all on one side of the mean, so that you subtract the area between -0.22 and zero from the area between -3.32 and zero. ...
Sampling and Sampling Distributions Sampling Distribution Basics
... target group. Suppose a national sample of 300 women from the target group is drawn to see how the campaign in working. 129 women in the group can recall seeing an ad or commercial for the new perfume. If the population proportion was 0.50, what is the probability of observing a sample proportion of ...
... target group. Suppose a national sample of 300 women from the target group is drawn to see how the campaign in working. 129 women in the group can recall seeing an ad or commercial for the new perfume. If the population proportion was 0.50, what is the probability of observing a sample proportion of ...
Statistics: Error (Chpt. 5)
... Use sample std. dev. (s) with data sets of 30 points or less Lower value of s indicates better precision Scatter from “true” value will decrease as N is increased What is n-1? Degrees of freedom: anytime you make an assumption, lose one degree of freedom, N-1 = # of data that remain independent ...
... Use sample std. dev. (s) with data sets of 30 points or less Lower value of s indicates better precision Scatter from “true” value will decrease as N is increased What is n-1? Degrees of freedom: anytime you make an assumption, lose one degree of freedom, N-1 = # of data that remain independent ...
Lecture Notes
... equally, that the chance the observed effect occurred by chance was 5%. That’s the best statistics can do, it cannot prove that the observed effect was real, only increase our confidence in the reality! As an aside at this point, we asked ourselves how we actually made the comparison between the ‘be ...
... equally, that the chance the observed effect occurred by chance was 5%. That’s the best statistics can do, it cannot prove that the observed effect was real, only increase our confidence in the reality! As an aside at this point, we asked ourselves how we actually made the comparison between the ‘be ...