Stats knowledge test

Question 1

Convenient samples are equivalent to random samples fro predicting Mu

Answer 1

False

Question 2

One of the reasons fro randomized samples is to make the comparison groups…

Answer 2

More similar

Question 3

With random sampling each subject has an equal chance of being selected

Answer 3

True

Question 4

Independent variable is the __ variable

Answer 4

predictor

Question 5

Dependent variable is the __variable

Answer 5

outcome

Question 6

Correlation does not equate to causation

Answer 6

True

Question 7

Correlations > or equal to 0.78 indicate the change can be attributed to the independent variable

Answer 7

False

Question 8

What types of study will show causation

Answer 8

Controlled study

Question 9

Mu is

Answer 9

average for the population

Question 10

x is

Answer 10

average for a sample

Question 11

Histograms - the X axis is numeric/quantitative

Answer 11

True

Question 12

The shape of a histogram matters - the shape of a bar graph is arbitrary

Answer 12

True

Question 13

Relative frequecy is a proportion. The total of all relative frequencies =1

Answer 13

True

Question 14

Proportions lie between or equal to 0 and 1

Answer 14

True

Question 15

A high percent of non responders increases the reliability of survey findings

Answer 15

False

Question 16

Mode is

Answer 16

The data with highest frequency

Question 17

Median is

Answer 17

The middle of the data

Question 18

An outlier is

Answer 18

A value that unexpectedly differs from the rest of the data

Question 19

Mean is

Answer 19

The mathematical average of the data

Question 20

In a normal distribution the mode=mean=median

Answer 20

True

Question 21

Square root of the variance = the standard deviation

Answer 21

True

Question 22

Z score is the number of standard deviations away from the mean

Answer 22

True

Question 23

Type I error is

Answer 23

Detecting a difference that does not exist

Question 24

Type II error is

Answer 24

Missing a real difference

Question 25

___ % of the data is within 1 standard deviation of the mean and ___ % is within stand deviations in normally distributed data

Answer 25

68,95

Question 26

A valid instrument is

Answer 26

Measures the construct it is intended to measure

Question 27

A reliable instrument is

Answer 27

Measures consistently

Question 28

The p value expresses the probability that the difference identified is due to change

Answer 28

True

Question 29

Alpha level is an agreed upon level of acceptable chance

Answer 29

True

Question 30

When looking at a results table you want to see p values that are larger than the alpha

Answer 30

False

Question 31

If the confidence interval crosses zero the results cannot be statistically significant

Answer 31

True

Question 32

Statistic to analyze nominal data

Answer 32

Chi Square

Question 33

Statistic used to compare the means of two groups

Answer 33

t test

Question 34

Statistic used to compare means for more than two groups

Answer 34

ANOVA

Question 35

You are doing a study to compare the effects of drug A against a placebo for relief of migrane pain rated on a scale 1-10. The mean reductionin pain for the drug group is 5, the reduction in pain for the placebo gorup is 4. What statistical test is most appropriate to compare the means of these two groups?

Answer 35

paired t test

Question 36

What are the upper and lower limits of a correlation coefficient?

Answer 36

-1.0 to +1.0