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41 Cards in this Set
- Front
- Back
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What is the formula for p-hat to estimate p?
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# of successes / n
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What is the mean of the sampling distribution of p-hat?
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The given parameter.
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What condition must be met for sample confidence interval to be met (i.e. the sample size to be good)?
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n(p-hat) and n(1-p-hat) must both be greater than 10.
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list the 4 symbols that describe parameter
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µ
β |
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List the 4 symbols that describe a statistic
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b
s |
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What are the conditions that must be met for a procedure
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1- randomness
2- normality |
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What does an expected total tell you?
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What you would expect to observe if Ho is true
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How do you perform the chi-squared equation?
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1- Ho - there is not a relationship between the two variables. Ha- there is a relationship
2- Determine degrees of freedom 3- Look to table E - Determine if the number correlating is lower than alpha - if the p is low - reject the ho |
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Grid for Type 1 and Type 2 Errors
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-
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What is the equation for the least -squares regression
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y-hat = a+bx
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What is the t statistic for testing H0:β = 0
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t = b/seb
this is an estimate of slobe /standard error |
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Conditions for: Anova
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1 quantative, 1 categorical - 2 or more sample means
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Conditions for: Chi-Square
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2 categorical, 2 questions
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Conditions for: Regression
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2 Quantitative
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for estimates of parameter what do you do?
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use slope - and divide - the estimate/ standard error
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How do you check the condition of linearity?
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Residual Plot - and smiley faces are bad
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How do you check the condition of normality
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histogram of the residuals and they must be normal
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How do you check for Equal standard deviation
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residual plot with no megaphones
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What does the confidence interval measure? and is it a large or small measurement?
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mean - small
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What does the projected interval measure? and is it a large or small measurement?
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predicted - has more variation due to one sample size
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can an observation conclude causation
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no
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on a residual plot, what pattern do you want to see?
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shotgun pattern
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what is a response variable
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the result of the explanatory variable
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what is the explanatory variable
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the first thing that happens
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regression is always ____
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quantative
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the regression null hypothesis is ____
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Ho: β = 0
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definition of r-squared
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how much of the change in y is explained by x
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what does the mean # explain
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the confidence interval
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what does the given # explain
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the predicted interval - this will be a wider range
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how do you determine the popoulation
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it is the subject of the treatment
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how do you find the equal variance? how do you determine if the condition is met?
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divide the smallest std error into the largest standard error - if the # is smaller than 2 the condition is met
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the symbol for less than
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>
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the symbol for greater than
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<
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68-95-99.7 Rule
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-
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What is a Simple Random Sample?
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1 random group
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What is a Stratified Sample?
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population has 2 or more categories - ex. boys and girls, teachers and students, etc
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What is a completey randomized experiment
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equal chance for treatment and placebo
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what is a multi-stage?
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localizing to smaller and smaller groups from a population - ex - farms - nationally - farms state - farms county or city
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what type of data does a box plot show
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quantative
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what happens to power as the sample size increases?
What happens to the Type 2 error? |
power increases
Type 2 errors decrease |
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the formula for power____
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1-β
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