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40 Cards in this Set
- Front
- Back
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What are measures of variability?
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Standard deviation
Variance IQR |
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What are the two forms of qualitative analysis?
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Nominal - non overlapping classes
Ordinal - Nominal and rank is meaningful |
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What are the two forms of quantitative analysis?
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Interval - ordinal and interval is meaningful
Ratio - interval and zero is meaningful |
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What can the value of the standard deviation never be?
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Negative
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What does the sum of the individual data elements from the mean always equal?
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Zero
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What value of f(x) must be about a discrete random variable and its probability distribution?
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Must be greater than or equal to 0
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E(x)
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Probability multiplied by the demand
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What do you do when finding the "p" percentile?
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If results in decimal always round up
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Increasing the sample size causes the margin of error?
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Decrease in value
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What is the central limit theorem?
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Given certain conditions, the mean of a sufficiently large number of independent random variable, each with a finite mean and variance, they will be approximately normally distributed
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When finding the sample size for a proportion, for a given level of confidence, the closer to .5 that p is estimated to be.....
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The larger sample size is required
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Increasing the level of confidence causes the margin of error?
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Increase in value
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According to the central limit theorem, the man of the sample means for a given sample is equal to?
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The population mean
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Increasing the sample size causes the standard error of the mean?
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Decrease in value
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What is the standard deviation of the sampling distribution commonly called?
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Standard error of the proportion
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What does the matched pairs t test deal with?
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Dependent samples
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What does the coefficient of determination lie between?
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0 and 1
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Residual
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The difference between the actual y value and the the predicted y value found using the regression equation
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When would the coefficient of determination be 0
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If x and y are totally unrelated
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In a simple linear regression, r and b1 must
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Have the same sign
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If there is more variability the is a _______ standard deviation
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HIgher
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What is the coefficient of variation?
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The ratio of the stand deviation to mean expressed as a percentage
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Combination
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Order doesn't matter, less ways
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Permutation
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Order does matter, more ways
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5 number summary
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1. smallest number
2. Q1 3. median 4. Q3 5. largest number |
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Sample size must be greater then _____ in order to be normally distributed
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30
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By increasing the sample size the standard deviation gets...
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Smaller
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Null hypothesis
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Tentative assumption about population parameter
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Alternative hypothesis
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Opposite of what is stated in null hypothesis
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Level of significance
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Probability of making a type 1 error when the null hypothesis is true as an equality
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P-value
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Probability that provides a measure of the evidence against the null hypothesis provided by the sample, smaller p-value indicate more evidence against the null hypothesis
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P-values is used to determine?
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Whether the null hypothesis should be rejected
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When to reject the null hypothesis...
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If the p-value is less than alpha
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Critical value
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largest value of the test statistic that will result in the rejection of the null hypothesis
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SSE
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Sum of squares due to the error
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SSR
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Sum of squares due to the residuals
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Covariance
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Descriptive measure of the linear association between two variables
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Correlation coefficient
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Measure of the relationship between two variables that is not affected by units of measurement by x and y
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Poisson distribution
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discrete probability distribution that expresses the probability of a given number of events occurring in a fixed interval of time and/or space
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Binomial distribution
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discrete probability distribution of the number of successes in a sequence of n independent yes/no experiments, each of which yields success with probability p
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