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23 Cards in this Set
- Front
- Back
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How do you tell if something is skewed to the left?
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away from the center
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How do you tell if something is skewed to the right?
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it is towards the center
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What is the main differ in how to tell btwn skewed to the left or right?
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(1)right-is towards the center
(2)left-is away from the center |
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What is the response varaible?
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y
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What is the predicator varaible?
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x
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What is a scatter?
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(1)direction-postive or negative or and aproxiamte of r
(2)form- (if linear, parabolra etc) (3)scatter= |
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What is a type I error?
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refers to when the reseacher rejects the null hypothesis when it is correct
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What is a type II error?
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this is when the resreacher accepts a null hypothesis that is false
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An education reseacher was interested in examining the effect of the teaching method and the effect of the particular teacher on students' scores on reading test. In study, there are four different teachers (Julina, Felix, Sona, and Helen) and three different teaching methods (method A, method B, method C). The number of students participating in the study was 258. Students are randomly assigned to a teaching method and teacher.
(1) Id the response variable method |
score on the reading test
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An education reseracher was interested in examining the effect of the teaching method and the effect of the particular teacher on students scores on the reading test. In study, there are four different teachers (Julina, Felix, Sona, and Helen) and three different teaching methods (method A, method B, method C). The number of students participating in the study was 258. Students are randomly assigned to a teaching method and teacher.
(1) Id the different factors in the experiment? |
(1)teaching method and the teacher
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Describe the scatter for
(1)air pressure and alitude |
(1)air pressure (x) can be used to predict alitude (y)
(2)the direction is postive with a r of about .8 (3)form-is linear (4)there is some scatter |
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DETERMINE IF OBSERVATIOAnAL OR EXPERIMENTAL STUDY
in a clincal trial, 780 participants suffering from high blood pressure were randomly assigned to one of three groups. Over a one month period, the first group recieved the experimental drug, the secound group recieved a placebo, and the third group no treatment. the diastolic pressure of each participatent was measured at the begining and end of the period and the change in blood pressure was recorded. The average change in blood pressure was caculated for each of the four groups and the averages compared |
experiment
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DETERMINE IF OBSERVATIOAnAL OR EXPERIMENTAL STUDY
at on hostpial in 1992, 674 women were diagnosed w breast cancer. Five years later, 88% of the women and 83% of the african american women were still alive |
observational study
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DETERMINE IF OBSERVATIOAnAL OR EXPERIMENTAL STUDY
A quaility control speacilist compares the output from a machine w a new lubricant to the output of other machines w the old lubricant |
experiment
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Find the explantory and response varaible
(1)for high grade point average and studying consistently |
(1)studying consistently:explantory
(2)high GPA= response |
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The explantory varaible can also be called the (1)
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predicator
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DETERMINE IF DOUBLE BLIND,BLIND OR NOT
Do energy bar snacks improve afternoon altertness? 100 factory workers were randomly selected and assigned into 2 groups. One group ate energy snacks at lunch and the other group ate placebo snacks. At the afternoon break, a significant increase in alertness was observed. |
blind
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DETERMINE IF DOUBLE BLIND,BLIND OR NOT
Is the addison Alegrbra class test superior to the currrently used text book? in promoting learning of alegbra? Evaluators only are informed that Group A will test from the current text and group B will test from the AW text |
blind
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In a recent study, a random sample of children in grades 2 through 4 showed a signficant negative relationship btwn the amount of homework assigned and student attidues. This is an example of (1)
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obeservational study
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In order to take a sample of 1200 people from the population, I first divde the pop into men and women and then take a simple random sample of 500 men and a seperate sample of 700 women. This is an example of (1)
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stratified random sampling
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DETERMIN THE TYPE OF VARIABLE
a person gender |
categorical
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T or F
you can describe the distrubtion of a bar chart as being skewed to the left |
false bc its categorical
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DETERMINe THE TYPE OF VARIABLE
the waiting time at a bust stop in minutes |
numerical
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