Statistics Exam 2 Study Guide – Norwood

Statistics Exam 2 Study Guide –
Norwood.




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, Statistics Exam 2 Study Guide –
Norwood.
1. What is a z-score? number of standard deviations away
from the mean

2. What is the z-score formula? z = (x - μ)/σ

z = (x-mean)/standard deviation

3. What is a continuous random variable? infinitely many values; infinite number
of un-
countable outcomes

4. What are some examples of a height, weight, distance
continu- ous random variable?

5. Confidence Interval excel =CONFIDENCE.T(0.05, standard deviation,
codes (for 95% interval) mean)

6. If an exponential distribution
has the rate parameter λ = 4, then expected value is 1/lambda
its expected value found how
expected value is 1/4th

7. The mean or the expected value of X for E(X)=μ=(a+b)/2, where a and b are
lower and
the continuous uniform distribution upper limits of values..
is computed as

8. The standard deviation of X is computed SD(x)= SQRT((b-a)^2)/(12))
as

9. If given 2 data end points 40 mean = 170
and 300 find the expected mean standard deviation = 75.06
and SD.

10. What is the probability that any random less than = decimals below mean
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, Statistics Exam 2 Study Guide –
Norwood.
number is more/less than the greater than = decimals above mean
mean? less than or equal to = decimals at and below
mean




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