Stats And Experimentla Design

Question 1

What does standard divination measure

Answer 1

The variation in the data values

Question 2

S.D.

Answer 2

Standard divination -measures the variation in the data values

Question 3

S.E.M

Answer 3

Standard error of the mean- measure accuracy of the mean

Question 4

Big standard error of the mean

Answer 4

Mean is less precise
Lots of variation

Question 5

Small standard error of the mean

Answer 5

Mean is more precise
Less variation in the data

Question 6

Error bars overlap

Answer 6

No significant difference in the samples. Any difference is due to chance

Question 7

How do you find the 95% confidence interval

Answer 7

Multiply the SEM by 2

Question 8

What graph should you use to compare groups

Answer 8

Bar graph

Kind of data:
Two or more categorical groups &
One numeric variable

Question 9

What graph should you use for correlation questions

Answer 9

Line graph

Kind of data:
Two or more categorical groups &
One numeric variable
Both variables must be continuously numeric. Connect dots only if one variable is linear time (i.e. days, years…) Put time on the X-axis.
Show correlation with a ‘line of best fit’.

Question 10

Chia square analysis

Answer 10

Chai square determines weather or not results seen to confirm of question hypothesis
*Line up the predetermined acceptable P value with the appropriate number of degrees of freedom. If your chi square value is less than this number, accept the null hypothesis. Ifthe chi square value is greater than or equal to this number, the null hypothesis must be rejected and an alternative hypothesis must be created.

Question 11

Null hypothesis

Answer 11

Н.
Assumption is status quo
States that there is no relationship between 2 variables; findings probably occurred due to chance events
Often stated as “There is no relationship between the Independent variable and the dependent variable.”
Ex: H. There is no difference between bees and butterflies in the number of flowers they pollinate.
Ex: H. Cats show no preference for food based on shape.Ex: H. Plant growth is not affected by light color.

Question 12

Alternative hypothesis

Answer 12

Rejection of an assumption
States that there is a relationship between 2 variables; findings probably did NOT occur due to chance events
Statement of relationship that is thought will occur.Ex: Ha A single bee visiting a flower will pollinate with a higher efficiency than a single butterfly.Ex: H, Cats prefer round shaped food
Ex: Ha Plants exposed to red light will have a higher rate of photosynthesis than plants exposed to green light.