What are the two types of normal distribution and what are the differences?
What is the standard normal random variable and standardizing X & the average and/or standard deviation do not equal 0 and 1 respectively?
100
What is the parameter (mean) associated with the exponential distribution?
What is theta?
100
If the mean of the sampling distribution of T is Theta then, ....?
What is the statistic T is an unbiased estimator of a parameter Theta. I.e. "unbiased."
100
If we are applying the CLT what is the variance of X bar? (Formula?)
What is sigma^2 / n?
200
(Total area under the curve) / (2) =
What is .5?
200
What will you go to the table with if you have -1 as your z-score?
What is 1.0 + .00?
200
What is the form required for calculating probabilities of exponential distributions?
What is P(X > a) or P(X >= a)?
200
mu(T) = E(T) < theta;
underestimate or overestimate?
What is underestimate?
200
A sample of 3 people are taken from a poisson distribution?
Will you be applying CLT? Why?
What is no, because neither the sample size or the shape are not large enough or normal, respectively?
300
Why does the uniform distribution have to be flat?
What is if there was curvature some intervals can have more probability (area) than others?
300
P(-1.25 < Z < 2.05)?
What is .8742?
300
What is the probability that X is greater than or equal to 6 with a theta of 6.
What is .37?
300
{mu, sigma, sigma^2} are?
What are examples of parameter?
300
A sample size of 29 is taken from a normal distribution.
Will we apply CLT? Why?
What is yes, because while 29 is not big enough we already know it is normal.
400
What is the variance of a uniform distribution from -2 to 2 ft.?
What is 1.333333?
400
What Z value is the 35th percentile?
What is -.39?
400
What is the probability of X being less than 100 when theta is 100.
What is .63?
400
Suppose both C and D are unbiased estimators of mu. The variance of C is 2.5 and the variance of D is 1.5. What should we use to estimate mu?
What is D? (note: not 1.5)
400
Z-scores are used when we don't have normality. True of false?
What is false, never use a z-score (or any related concepts) if you do not have a normal distribution (shape.)
500
The change in the height of tides approaching some beach is uniform from -4 to 4 inches. Find the probability the change is greater than 2 in absolute value.
What is 1/2?
500
Suppose the lifetimes of a certain brand of artificial grass are normally distributed with an average of 6 months and a standard deviation of .5.
Find the watering time needed (per week in hours) by the grass manufacturer (to label their packages) so that no more than 1% of the packages are returned as "dead."
What is 4.835 hours/week?
500
What is the probability that X is between 150 and 250 with theta being 100?
What is .141?
500
A graph with a taller peak has more variance. True or false?
What is false?
500
What is the Z-score of X bar when you know the distribution is normal, the average is 39, the sample size is 44 and the standard deviation is 9. Your X bar in question is 35.
Z= ?