Step-by-step explanation:
a) 3km=20 minutes
times both side by 3 as 20x3 is 60mins equal 1 hour
so 3kmx3 is 9km
b) 3km is 20 mins
times both side by 6 as 20x6 is 120 mins which is equivalent to 2 hours
therefore, 3kmx6 is 18km
c) the assumption is that the longer you run means that youll jog more further so more fitness
Answer:
Step-by-step explanation:
Given that in an investigation of pregnancy-induced hypertension, one group of women with this disorder was treated with low-dose aspirin, and a second group was given a placebo. A sample consisting of 50 women who received aspirin has mean arterial blood pressure 120mmHg and standard deviation 10mmHg; a sample of 42 women who were given the placebo has mean blood pressure 115mmHg and standard deviation 12mmHg.
Population variances are equal

(two tailed test at 5% significance level)
Here x denotes group I and Y group II
N Mean StDev SE Mean
Sample 1 50 120 10 1.4142
Sample 2 42 115 12 1.8516
Pooled std deviation = 10.9565
df=80
Mean difference= 5
Test statistic t = mean diff/std error =
=2.1803
p value = 0.0318
since p <0.05 we reject H0
b) We find p >0.01 hence at 1% significance level we accept H0
This implies that 99% confidence interval contains mean difference =0
15. -2
16. A. The pool was originally empty
No it should be a 50% chance because the first roll is a independent variable, 6/12=1/2
Answer:
a. and iii
b. and i
c. and iv
d. and ii
Step-by-step explanation:
a.
x + 12 > 15 = x > -2
- 12 - 12
x > 3
2(
x = 3)
-3x > 6
/-3 /-3
x > -2
b. 4x + 12 < 20 = x <2
- 12 - 12
4x < 8
/4 /4
x < 2
c. -8x < 16 = x > -2
/ -8 /-8
x > -2
d. 55 < 35 + 10x = x > 2
-35 -35
20 < 10x
/10 /10
2 < x = x > 2
Hope that helps!