Answer:
(-4, 2)
Step-by-step explanation:
Answer:
y=-3x-1
Step-by-step explanation:
Answer:
50
Step-by-step explanation:
10 in 1cm so that will make 50 mm 5 cm
Answer: (1.375, 18.625 )
Step-by-step explanation:
The confidence interval for population mean is given by :-
(1)
, where
= sample mean
t* = critical value.
SE = standard error
As per given , we have
n= 21
Degree of freedom : df = n-1=21-1=20
Significance level : ![\alpha=1-0.90=0.10](https://tex.z-dn.net/?f=%5Calpha%3D1-0.90%3D0.10)
Standard error : SE= 5
The critical t-value for confidence interval is a two-tailed value with respect to the given degree of freedom i.e.
.
Using student's t-distribution table ,
![t_{(\alpha/2,df)}=t_{(0.10/2, 20)}=t_{(0.05, 20)}=\pm1.725](https://tex.z-dn.net/?f=t_%7B%28%5Calpha%2F2%2Cdf%29%7D%3Dt_%7B%280.10%2F2%2C%2020%29%7D%3Dt_%7B%280.05%2C%2020%29%7D%3D%5Cpm1.725)
The 90% confidence interval will be :
[by formula in (1)]
Hence, the limits of the confidence interval=(1.375, 18.625 )