Karteikarten
Stats 151 - Sample Distribution and Probability in Normal Distribution
Karten in diesem Stapel (10)
- 1if a school has a GPA of 2.8 and a standard deviation of 0.8 what percent of students have a GPA less then 2? greater then 3?P(x< or equal to 2) = P(Z < -1) = 0.1587
P(x>3) = P(Z>0.25)=1-P(X< of equal to 0.25) = 1-0.5987 = 0.4013 - 2between 2 and 3?- P(2
- 3What is the minimum GPA needed to be in the top 10%creates two areas, 0.1, and 0.9. find the Z score for 0.9 which is 1.28 and then use to solve for x in the equation Z = x-u/sigma
- 4what is a normal probability plot?a scatter plot of the normal Z score pairs
- 5how do you find the Z score pairs?order the data from smallest to largest. then us table 3 to find the normal sores using the z scores. then plot the data (z,x)
- 6the mean of X is always equal to____ no matter the width of the distribution?x bar
- 7what is parameter?a number calculating a population and describes the characteristics of a population
- 8what is a statistic?a number calculated from and describing the characteristics of a sample
- 9how do we find x bar?u, sigma/ square root of n
- 10the avergae adult weight is 175 pounds with a standard deviation of 25 pounds. an elevator has a weight limit of 10 people or 2000 pounds. What is the probability that the ten people who get on an elevator exceed the weight limit?P(overload) = x1 + x2 + ………x10 > 2000 pounds = X1 + x2 + ……….. x10 / 2 = 2000/10 = 200. the Z score for 200 is 3.16. 1-p(z < or equal to 3.16) = 0.9992 = 0.0081-p(z < or equal to 3.16) = 0.9992 = 0.008
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- Chemistry 101 Stats 151 Karteikarten am Stats 151 - Sample Distribution and Probability in Normal Distribution, erstellt von jennabarnes12387 am 24/02/2014.
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