Elementary Statistics in Criminal Justice Research Unit 3 Flashcards Preview

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Flashcards in Elementary Statistics in Criminal Justice Research Unit 3 Deck (35)
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1
Q

Frequency distribution that has an end

A

Finite frequency distribution

2
Q

Frequency distribution that keeps going constantly (conceptual and theoretical)

A

Infinite frequency distribution

3
Q
  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
A

Characteristics of a Normal Frequency Distribution Curve (Normal Curve)

4
Q

+/- 1 s of the mean

A

68.26%

5
Q

+/- 2 s of the mean

A

95.44%

6
Q

+/- 3 s of the mean

A

99.74%

7
Q

The standard deviation unit for the standard normal distribution.

A

z score

8
Q

Probability is about how accurate generalizations are.

A

Probability is about how accurate generalizations are.

9
Q

Two uses of inferential statistics

A
  1. Estimate parameters

2. Test hypotheses

10
Q

Populations have parameters

A

Samples yields statistics

11
Q

number of observations/total number of possible observations

A

Probability of an event.

P(A)

12
Q

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

A

Rule of addition (probability)

13
Q

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

A

Rule of addition (non-exclusivity)

14
Q

=1-P(A)

A

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

15
Q

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

A

Rule of multiplication

16
Q

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

A

Rule of multiplication

17
Q

s/√n-1

A

standard error of the sample mean

18
Q

range between highest and lowest

A

confidence interval

19
Q

the end points of a confidence interval

A

confidence limits

20
Q

Used when sample size is 30 or less

A

t score

21
Q

Departure from symmetry

A

Skewness

22
Q

peak of the curve is more to the right

A

negatively skewed

23
Q

peak of the curve is more to the left

A

positively skewed

24
Q

peak of the curve is in the center and symmetrical

A

normal curve

25
Q

the peakedness of a curve/distribution

A

kurtosis

26
Q

Almost flat curve

A

Platykurtic

27
Q

Normal curve (skewness) what is it called?

A

Mesokurtic

28
Q

Hi slim peak on a curve

A

Leptokurtic

29
Q

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

A

mean

30
Q

square root of the variance

A

standard deviation

31
Q

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

A

standard deviation

32
Q

s/√n

A

standard error of the mean

33
Q

mean+/- t/z (SE)

A

confidence interval

34
Q

1-level of confidence

A

alpha

35
Q

√P(1-P)/N

A

standard error of the proportion