Stats Y1 (txt, practise, genie)

Question 1

mean= 250

Answer 1

Question 2

Answer 2

Question 3

mean is 19,616

Answer 3

Question 4

Answer 4

Question 5

b

Answer 5

Question 6

Answer 6

when using systematic sampling to find sampling interval

divide pop size by desired sample size.

Question 7

Answer 7

Question 8

Answer 8

quota sampling

Question 9

why is Daily maximum relative humidity a continuous variable

Answer 9

can take any percentage value
between 0 and 100.

Question 10

what will the average temperatures be like in July for each hemisphere

Answer 10

Perth is in the Southern hemisphere, where it will be winter in August,

Jacksonville is in the Northern hemisphere, where it will be summer.
So it is likely to be hotter in Jacksonville.

Question 11

Answer 11

Question 12

how is mean wind speed direction measured as

Answer 12

as a bearing

as a cardinal direction

Question 13

mean is 608.4

Answer 13

2/5 since in the list, 2 out of 5 are below 600

Question 14

Answer 14

0+(13/18)*1.5

LE=0
Class width is=1.5
frequency=18
how much in=13

median=13

boundary:
0 - 1

new boundary:
0 - 1.5

Question 15

the upper quartile of a group of cows is 430kg

what does this imply?

Answer 15

3/4 of the cows weigh less than 430

Question 16

just part a

Answer 16

median value is 31/2 = 15.5

15.5-9= 6.5 into category 400-449

399.5 + (6.5/10)*50 = 432kg

class width=50
LE= 399.5

Question 17

Answer 17

grouped frequency data is in ranges with </ > signs
so do not +0.5 or -0.5 the boundaries, leave them alone

a) total= 100

80 percentile= 80

80-61 =19

2.5 + (19/28) *0.5 = 2.84m

Question 18

Question 19

Answer 19

use CAL-> 6
input X values as the midpoints

Question 20

Answer 20

1) make into less than

2) use inverse

3) rearrange

Question 21

Answer 21

Use area 0.05 as you have to come from the Left

Question 22

Answer 22

Question 23

Answer 23