maths Qs

Question 1

P value is > 0.5. state what this P value tells you about this difference. Explain your answer using the words probability and chance.

Answer 1

This difference is not significant. There is a greater than a 0.5 probability that this difference is due to chance

Question 2

A teacher studying these data with her students told her lass that no definite conclusions could be drawn when comparing the mean values in the graph. Suggest why the teacher said this

Answer 2

no error bar/ SD

to show if overlap occurs so difference in means is not significant/ due to chance

Question 3

if overalap in SD

Answer 3

indicated no significant differencnce

Question 4

if no overlap in SDs

Answer 4

significant difference

Question 5

24hours to min

Answer 5

24 × 60 = 1440 minutes

Question 6

nm to micrometers

Answer 6

1000 nm = 1 micrometer

Question 7

cm to micrometers

Answer 7

1cm = 10000 micrometer

Question 8

suggest and explain

Answer 8

point and why important

Question 9

Suggest and explain two ways in which the scientists could have improved the
method used for data collection in this investigation.

Answer 9

1. Collect at more times of the year so more points on graph/better line (of best fit) on graph;
2. Counted number of individuals in each species so that they could calculate index of diversity;
3. Collected from more sites/more years to increase accuracy of (mean) data;

Question 10

The scientists also concluded that this heat treatment did not affect the xylem.
Explain how the results in Table 4 support this conclusion

Answer 10

1. (The water content of the leaves was) not different because (means ± 2) standard deviations overlap;
2. Water is (therefore) still being transported in the xylem (to the leaf)
   OR
   Movement in xylem is passive so unaffected by heat treatment;