Type of Test
The type of test used to determine if the average number of hours studied by high school seniors in a week is 5 hours.
What is the one sample t - test?
The null hypothesis in a paired t - test.
This is the formula used to find degrees of freedom when conducting an independent t - test.
What is the smaller of n1 - 1 and n2 - 1?
A table that displays the proportion of individual frequency to the total frequency of the data.
What is a relative frequency table?
Type of variables that are displayed in a contingency table.
What are categorical?
The statistic that summarizes the direction and strength of the linear relationship in a single numeric value.
What is the Pearson correlation coefficient, r?
The type of test used to determine if there is a difference between the GPAs of freshmen, sophomores, juniors, and seniors.
What is an ANOVA?
The degrees of freedom in a paired t - test.
What is the number of pairs - 1?
The correct conclusion when conducting an independent t - test with p > 0.05
What is "no difference in population means"?
The type of chart that shows categorical data frequencies where normality and skewedness are not descriptors we can use.
What is a bar chart?
The type of distribution that looks at the overall distribution of one variable, ignoring the other.
What is a marginal distribution?
The formula for standardized value of x.
What is zx = (x - mean of x)/standard deviation of x?
The type of test that determines if there is a difference between the average number of hours studied by males in high school versus females in high school.
What is the independent t - test?
A range of possible values of the population mean.
What is a confidence interval?
The number of possible comparisons in post-hoc testing after a significant F-statistic resulted in ANOVA.
What is [k(k-1)]/2, where k is the number of groups?
The hypothesis (and test) that states the observed distribution of the variable differs from the expected distribution.
What is the alternative hypothesis in a chi-square goodness of fit test?
The degrees of freedom for a chi-square test of independence.
What is (# of rows - 1) x (# of columns - 1)?
Hidden variables that cause strong correlations that are the result of spurious correlations (when 2 variables are correlated by chance, not due to an actual relationship).
What are lurking or confounding variables?
The type of test used to determine if there is a difference in the mean value of blood pressure before taking a prescribed medication and the mean value of blood pressure after taking a prescribed medication.
What is the paired (or dependent) t - test?
A statistic expressing the amount of random sampling error in the results of a survey.
What is a margin of error?
The p value when it is determined there is a significant difference between at least 2 group means in an ANOVA.
What is p < 0.05?
The degrees of freedom in a chi-square goodness of fit test.
What is the number of categories - 1?
The hypothesis (and test) that states two variables are independent.
What is the null hypothesis of the chi-square test of independence?
A residual value.
What is the observed point - predicted point?
When an ANOVA produces a significant F - statistic, we use this test to investigate which pairs of groups have significantly different means.
What is post - hoc testing?
The test statistic for a one sample t - test.
What is (sample mean - claimed mean from H0) / (sample standard deviation / sq root of sample size)
Type of error when H0 is true but we rejected H0.
What is a Type I error?
The sum of (observed - expected counts)2 / expected counts.
What is the chi-square test statistic?
The expected counts for each cell in a table when performing a chi-square test of independence.
What is (row total x column total) / grand total?
The 6 assumptions for creating a linear regression.
What are random samples, independent observations, linear trend visible, no extreme outliers, y is normally distributed around x, same variance.