Formulas
Which tests
Hypotheses
Using Tables
Error & Power
100

the square root of n times less than the population standard deviation

Standard error

100

You are given population standard deviation and asked for range of means. Which test do you use? 

z-distribution

100

group 1 will score differently than group 2

1-tail or 2-tail test?

2-tail test

100
You have population standard deviation. 

z-table or t-table? 

z-table

100

What is it called when the researcher rejects the null when it is actually true?

Type I error

200

Zcritical times the population standard error added to the  sample mean

z-distribution

200

You are given sample standard deviation and not asked for range of means. Which test do you use? 

t-test

200

mu1 < mu2

null or alternative?

Alternative hypothesis 

200

N=100, population standard deviation=3.4, a=0.05,  1-tail test

What is your critical value? 

1.65

200
What is it called when a researcher fails to reject the null when it is false?

Type II error

300

tcritical times the sample standard error added to the sample mean

t-distribution

300

You are given sample standard deviation and asked for range of means. Which test do you use? 

t-distribution

300

Group 1 will score better than group 2. 

What is the null hypothesis? 

Group 1 will score less than or equal to group 2

(mu1 < or = mu2)

300

2-tail test, a = 0.05. What's zcritical? 

+/- 1.96

300

The placebo effect is an example of what? 

Type I error

400

Sample standard error times less than the difference between the sample mean and population mean

t-test

400

You are given population standard deviation and not asked for range of means. Which test do you use? 

z-test

400

mu1 = mu2

Cut left or right? 

Both
400

n=14, sample standard deviation=3.4, a=0.05, 1-tail test

What is your critical value?

1.771

400

What corresponds to the probability of a type I error? 

alpha

500

Population standard error times less than the difference between the sample mean and population mean

z-test

500

What two criteria are needed to determine which test you should use? 

Population vs sample standard deviation 

Range of means

500

mu1 > mu2; mu2 is the sample

Cut left or right?  

Right

500

n=32, sample standard deviation=1.3, a=0.05, 2-tail test

What is the critical value?

2.000

500

What is the probability that the test will correctly reject a false null hypothesis? 

Power

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