Calculate the value of A, when these values are: B = 30, C = 5, and D = 10

Test whether the independent variables effectively estimate the dependent variable A. Use 0.05 level of significance.

Data to Data Analysis to Regression

	y	x1	x2	x3
Item	A	B	C	D
1	250	35	3	6
2	360	29	4	10
3	165	36	7	3
4	43	60	6	9
5	92	65	5	6
6	200	30	5	5
7	355	10	6	7
8	290	7	10	10
9	230	21	9	11
10	120	55	2	5
11	73	54	12	4
12	205	48	5	1
13	400	20	5	15
14	320	39	4	7
15	72	60	8	6
16	272	20	5	8
17	94	58	7	3
18	190	40	8	11
19	235	27	9	8
20	139	30	7	5