Random/Review
The value of i
What is Convenience sampling?
This statistical value measures how strong the linear relationship is between to variables. It also indicates whether two variables have a positive or negative linear relationship.
What is r, the correlation coefficient?
THIS value determines how well a regression model fits a data set.
What is R2, coefficient of determination?
The best model for a data set will have the highest value for this.
What is R2?
The number of rows and columns matrix A2x1.
What are 2 rows and 1 column?
Having a sample that is THIS is the most efficient way to reduce bias.
What is random?
A negative r value would indicates THIS kind of correlation between two variables.
What is a negative correlation?
What is a (very) good fit for the data?
What is linear regression model?
This is done to get rid of square root in the bottom of fractions.
What is rationalizing (the denominator)?
Double Jeopardy
What is sample size?
R values for comparing heat index to outside temperature and humidity were found to be:
0.94 (heat index vs. temperature) and
0.87 (heat index vs. humidity)
This variable would be the better predictor of heat index.
What is temperature?
The linear regression equation for this data set.
What is y = 10.23x - 0.8?
This type of model should be used to fit data that increases AND decreases at a given rate.
What is quadratic?
The dimension of the product matrix produced by A2x3 X B3x1.
What is 2x1?
A study aimed to find the average height of high schoolers at WHS. They made two completed lists: one with all the female student and another with male students. They then split each list into 4 separate lists based on grade level and randomly selected 10 male and 10 female students from each grade to be in the study. These subgroups are referred to as THIS.
What are "strata"?
Double Jeopardy
What is -1?
The equation of the curve of best fit for this data set.
What is y = -0.23x2 + 6.2x + 12.07?
This kind of model is likely the best fit for data modeling trends in a population.
What is exponential?
For a complex number a + bi, this is a - bi.
What is the complex conjugate?
In THIS method of sampling, individuals from pre-existing groups within the population are chosen to be in the sample. The existing groups are also called this.
What is cluster?
The r2 value for a quadratic model fit to a data set was found to be 0.98. The r2 value for a linear model fit to the data set was found to be 0.31. Therefore the r value for the data is likely close to THIS value.
What is 0?
The average monthly temperatures in Elon, NC were recorded for 7 month are are reported in the data table.
THIS kind of regression model would be the best fit for this data.
What is quadratic?