Answer:
(a) It is an experiment.
(b) Group III has been tested to compare the effect of tea
Step-by-step explanation:
24 volunteers are randomly selected to one of the three groups.
Group I drinks two cups of hot black tea without milk
Group II drinks two cups of hot black tea with milk
Group III drinks two cups of hot water but no tea.
At the end of the month, the researchers measured the change in each of the participant's heart health.
The average change of health status of three Groups can be measured and let it be X1', X2' and X3'. We can set up the hypothesis of no difference of heart health i.e H0 : µ1 = µ2 = µ3 against the alternative hypothesis that they are not equal. As the sample size is less than 30, we can use t-statistic.
Under the above logic, (a) it is an experiment.
(b) Group III has been tested to compare the effect of tea or to have comparison between GroupI and Group III.
Answer:
240cm²
explanation
Diagonal ²=Length ²+breath ²
26²=10²+length ²
676=100+length ²
576=length ²
length=24cm
Area of a rectangle=length×breath
Area=24×10
=240cm²
560,000+313 = 560,313
560,313-100,000= 460,313
answer is 460,313
Answer:
512
Step-by-step explanation:
1st term =a
common ratio = r
a*r with the exponent n-1
a=4 r=2 n=8
8th term 4*(2 at the seventh power)= 512
OR
1st term :4
2nd term = 4*2=8
3rd term 8*2=16
4th term 12*2=32...............8th term 256*2=512
Answer:
D. 200
Step-by-step explanation:
Laticia doing her survey on a sample that has a size of about 25% of the population. That means the sample is approximately four times larger than the sample she takes. Unless its ratio or percentage, any data she takes will be 1/4 of the population. If 51 student of her sample choose summer as their favorite, predicted number on the population will be:
51 * (100%/25%)=
51 * 4= 204
The number will be around 200.
