BASIC MIDTERM REVIEW!

Question 1

3 possible test statistics

Answer 1

Binomial test (data to a specific hypothesized value)

Chi-squared goodness of fit test (ass no less than 1, no more than 20% less than 5)

Chi-squared contingency analysis (independence btwn 2 cat variables)

Question 2

calc mean

Answer 2

average, calc like an average

Question 3

median

Answer 3

middle measurement in a set of ordered data

Question 4

standard deviation

Answer 4

symbolized by s = Positive square root of the variance!!! sqrt(s^2)

Question 5

variance

Answer 5

*****. 1. Determine value of Y bar - MEAN OF SAMPLE/AVERAGE!!!!!

s^2 = sum from 1 to N of (sample value - average value)^2 / n - 1

n = sample size

Question 6

standard error

Answer 6

the standard deviation of an estimate’s sampling distribution

Question 7

odds

Answer 7

odds of success/odds of failure

if p = odds of success

odds = p/ (1-p)

Question 8

odds ratio

Answer 8

odds of success in one group/odds of success in the other

Question 9

BAE’s rule (Bayes theorum)

Answer 9

P(A|B) = P(B|A) * P(A) / P(B)

WHERE P(A|B) = probability of A given B

Question 10

Graphs for single categorical variable

Answer 10

Bar graph, histogram, cumulative frequency distribution

Question 11

Graphs for 2 variables: cat/cat

Answer 11

contingency table, grouped bar graph, mosaic plot

Question 12

graphs for 2 variables: cat/num

Answer 12

multiple histograms, cumulative frequency distribution, line plot for cordial data only

Question 13

graphs for 2 variables: num/num

Answer 13

scatter plot, line plot, map????

Question 14

mode

Answer 14

most common value

Question 15

range

Answer 15

max - min value

Question 16

coefficient of variation

Answer 16

rep by CV = 100% s/Ybar = 100% standard deviation / average

Question 17

why does coefficient of variation matter?

Answer 17

significancy of variation changes based on how large an organism/ something is

Question 18

equation for (x / X) in binomial prob distribution equation

Answer 18

n! / [X! * (n - X)!]

Question 19

0!

Answer 19

= 1

Question 20

1!

Answer 20

= 1

Question 21

mean of a binomial distribution

Answer 21

u = np where n = # of trials, p = probability of success

Question 22

variance of binomial distribution

Answer 22

= np(1-p)

Question 23

phat of a sample

Answer 23

proportion of successes in a sample (p hat) = X / n where X = number of successes, n = ind in a sample

Question 24

mean of sample proportion

Answer 24

mean = p (the sample proporiton of successes)

Question 25

variance of sample proportion

Answer 25

p(1-p) / n

Question 26

degrees of freedom for a chi squared test

Answer 26

df = (number of categories) - (number of parameters est. from the data) - 1

Question 27

standard deviation of a sample mean

Answer 27

sd of mean = standard deviation / sqrt (n)