Elementary Statistics in Criminal Justice Research Unit 3

Question 1

Frequency distribution that has an end

Answer 1

Finite frequency distribution

Question 2

Frequency distribution that keeps going constantly (conceptual and theoretical)

Answer 2

Infinite frequency distribution

Question 3

1. The curve is smooth
2. Unimodal
3. Symmetrical
4. Mean=Media=Mode
5. Interval data only
6. 1 and 100% under the curve
7. s distance btwn mean & other value

Answer 3

Characteristics of a Normal Frequency Distribution Curve (Normal Curve)

Question 4

+/- 1 s of the mean

Answer 4

68.26%

Question 5

+/- 2 s of the mean

Answer 5

95.44%

Question 6

+/- 3 s of the mean

Answer 6

99.74%

Question 7

The standard deviation unit for the standard normal distribution.

Answer 7

z score

Question 8

Probability is about how accurate generalizations are.

Answer 8

Probability is about how accurate generalizations are.

Question 9

Two uses of inferential statistics

Answer 9

1. Estimate parameters

2. Test hypotheses

Question 10

Populations have parameters

Answer 10

Samples yields statistics

Question 11

number of observations/total number of possible observations

Answer 11

Probability of an event.

P(A)

Question 12

P(A or B)=P(A) + P(B)

Answer 12

Rule of addition (probability)

Question 13

P(A or B)=P(A) + P(B) - P(A-B)

Answer 13

Rule of addition (non-exclusivity)

Question 14

=1-P(A)

Answer 14

Compliment of an Event or the probability of an event not occuring

Question 15

P(A and B)=P(A) + P(B) (not A)

Answer 15

Rule of multiplication

Question 16

The probability of the combination of independent events is equal to the product of their separate probabilities

Answer 16

Rule of multiplication

Question 17

s/√n-1

Answer 17

standard error of the sample mean

Question 18

range between highest and lowest

Answer 18

confidence interval

Question 19

the end points of a confidence interval

Answer 19

confidence limits

Question 20

Used when sample size is 30 or less

Answer 20

t score

Question 21

Departure from symmetry

Answer 21

Skewness

Question 22

peak of the curve is more to the right

Answer 22

negatively skewed

Question 23

peak of the curve is more to the left

Answer 23

positively skewed

Question 24

peak of the curve is in the center and symmetrical

Answer 24

normal curve

Question 25

the peakedness of a curve/distribution

Answer 25

kurtosis

Question 26

Almost flat curve

Answer 26

Platykurtic

Question 27

Normal curve (skewness) what is it called?

Answer 27

Mesokurtic

Question 28

Hi slim peak on a curve

Answer 28

Leptokurtic

Question 29

The sum of a set of scores divided by the total number of scores in a set

Answer 29

mean

Question 30

square root of the variance

Answer 30

standard deviation

Question 31

a measure of variability that reflects the typical deviation from the mean

Answer 31

standard deviation

Question 32

s/√n

Answer 32

standard error of the mean

Question 33

mean+/- t/z (SE)

Answer 33

confidence interval

Question 34

1-level of confidence

Answer 34

alpha

Question 35

√P(1-P)/N

Answer 35

standard error of the proportion