1.State your research hypothesis in the form of a relation between two variables.
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1.State your research hypothesis in the form of a relation between two variables. 2. Find a statistic to summarize your sample data and convert the above into statistical hypothesis: Statistical hypothesis: r > 0 m 1 - m 2 < 0 3. Set a straw man, i.e., null hypothesis

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1.State your research hypothesis in the form of a relation between two variables.

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1 state your research hypothesis in the form of a relation between two variables

1.State your research hypothesis in the form of a relation between two variables.

2. Find a statistic to summarize your sample data and convert the above into statistical hypothesis:

Statistical hypothesis:r > 0m1 - m2 < 0

3. Set a straw man, i.e., null hypothesis

Null hypothesis:r = 0m1 - m2 = 0.

4.Set the alpha level and conduct the statistical test with the assumption that the null is true.

5. Make a decision with potential errors.


1 state your research hypothesis in the form of a relation between two variables

Sampling Distribution of a Statistic

Imagined and theoretical


1 state your research hypothesis in the form of a relation between two variables

μ=72

μ=72

PopulationSampling Distribution


1 state your research hypothesis in the form of a relation between two variables

Sample size N = 36

μ=72

μ=72

μ=72


1 state your research hypothesis in the form of a relation between two variables

Sample Size N = 16

μ=72

μ=72


1 state your research hypothesis in the form of a relation between two variables

Sample Size N = 36

μ=72

μ=72


Central limit theorem

Central Limit Theorem

The mean of the sampling distribution of means (any statistic) equals the population mean (any parameter).

The standard deviation of the sampling distribution of means (any statistic) equals the population standard deviation divided by the square root of sample size. This is called the standard error of means.

The sampling distribution of means is normal independent of the pattern of the population distribution, given a large enough sample size (e.g., n = 30)


1 state your research hypothesis in the form of a relation between two variables

An example:

Hypothesis: Chinese children today are overweight.

Choose a statistic: Mean weight

Past records: m = 50 lb; s = 30 lb

H1: m > 50 lb

H0: m = 50 lb

a<.01

n = 225 children ages 7 to 9;


1 state your research hypothesis in the form of a relation between two variables

Reject Null

μ=50

2.32


1 state your research hypothesis in the form of a relation between two variables

Point estimate:

Interval estimates:

CI90

1.64

-1.64


1 state your research hypothesis in the form of a relation between two variables

An example:

Hypothesis: Children’s weight differs from past.

Choose a statistic: Mean weight

Past records: m = 50 lb; s = 30 lb

H1: m 50 lb

H0: m = 50 lb

a<.01; two tails, a<.01/2 or a<.005 at each tail

n = 225 children ages 7 to 9;


1 state your research hypothesis in the form of a relation between two variables

-2.58

μ=50

2.58


1 state your research hypothesis in the form of a relation between two variables

Null Hypothesis

Actually True

Actually False

NOT reject

Decision

Reject


1 state your research hypothesis in the form of a relation between two variables

H0: μ = 50

Reject Null

.05

z = 1.96

μ= 50

H1: μ > 50

power

β


1 state your research hypothesis in the form of a relation between two variables

H0: μ = 50

Reject Null

.01

z = 1.96

μ= 50

H1: μ > 50

power

β


1 state your research hypothesis in the form of a relation between two variables

Large N

H0: μ = 50

Reject Null

.05

μ= 50

z = 1.96

H1: μ > 50

power

β


1 state your research hypothesis in the form of a relation between two variables

Small N

H0: μ = 50

Reject Null

.05

μ= 50

z = 1.96

H1: μ > 50

power

β


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