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Research And Stats > Chapter 9 > Flashcards

Chapter 9 Flashcards

1
Q

What is z score

A

A standardized score that indicates the location of a score within the population distribution

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2
Q

What is a standardized score

A

Z score

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3
Q

X

A

The score that we want to transform

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4
Q

U

A

The population mean

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5
Q

a

A

Population standard deviation

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6
Q

What is a normal distribution

A

A symmetrical distribution in which the percentage of the score in each Pershke portion of the distribution is known

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7
Q

When it is also a special type of symmetrical distribution

A

Normal distribution

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8
Q

What is unit normal table

A

A table of the proportion of scores in a normal distribution form many different Z score of values

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9
Q

When that contains the proportion of scores from different sections of the normal distribution from many Z score values

A

Unit normal table

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10
Q

What is standard error

A

The estimate of sampling error that is determined from the standard deviation of the distribution of the sample means

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11
Q

When we can calculate the standard deviation of the distribution of sample means

A

Standard error

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12
Q

What is central limit theorem

A

The mathematical description of the shape of the Distribution of sample means that states that for a population with mean and standard deviation the distribution of sample means for sample size will have a mean equal to a standard deviation equal to the standard error and the shape of approaching a normal distribution as in becomes very large

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13
Q

When is a mathematical description of the shape of the distribution of sample means that will allow us to determine if the distribution of sample means is normal shape

A

Central limit theorem

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14
Q

Five steps of hypothesis testing process

A

One state hypothesis
Two set a decision criterion
Three collect sample data
Four calculate statistics
Five make a decision

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15
Q

What is scientific or alternative hypothesis

A

The hypothesis that in effect or relationship exist in the population

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16
Q

When a researcher made it a hypothesis that is in effect of the independent or subject variable exist

A

A scientific or alternative hypothesis

17
Q

What is null hypothesis

A

The hypothesis that an effect or relationship does not exist in the population

18
Q

We must consider a second hypothesis in our test is the opposite hypothesis to the scientific or alternative hypothesis

A

Null hypothesis

19
Q

What is two tailed hypothesis

A

Both directions of an effect or relationships are considered in the alternative hypothesis of the test

20
Q

When we are considering both possible directions of the difference between means in the hypothesis

A

Two tailed hypothesis

21
Q

What is a one tailed hypothesis

A

Only One Direction of an affect our relationship is predicted in the alternative hypothesis of the test

22
Q

What is alpha level

A

The probability level used by researchers to indicate the cut off probability level allow them to reject the Null hypothesis

23
Q

 The decision criterion value marks off a portion of the distribution that represents the most extreme

A

The alpha level

24
Q

What is critical region

A

The most extreme portion of the distribution of a statistical value for the null hypothesis determined by the decision criterion

25
Q

When is it the part where we look at to see if we can reject the no hypothesis

A

Critical region

26
Q

What is type I error

A

And air made in a hypothesis test when the researcher reject the null hypothesis when it is actually true

27
Q

What is called _______ ______ _____ Indicates that the researcher has rejected the null hypothesis when it is really true

A

Type I error

28
Q

What is type II error

A

An error made in the hypothesis when the researcher fails to reject the null hypothesis when it is actually false

29
Q

When can be made when the null hypothesis not rejected but its actually false

A

Type II error

30
Q

What is power

A

The ability of a hypothesis test to detect an effect or relationship when one exist

31
Q

What do you increase your hypothesis test to detect an effect on relationships that actually exist

A

power

32
Q

What does significant test mean

A

P value is less than or equal to the alpha level in an inferential test and null hypothesis this can be rejected

33
Q

 Standard error

A

Population standard deviation divided by the square root of the sample size

34
Q

One sample Z test

A

Sample means minus the population mean divided by the standard error 

Research And Stats (9 decks)

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