Question

求解统计学题目

The managers of a brokerage firm are interested in finding out if the number of new clients a broker brings into the firm affects the sales generated by the broker. They sample 5 brokers and determine the number of new clients they have enrolled in the last year and their sales amounts in thousands of dollars. These data are presented in the table that follows.
Broker Clients(顾客x) Sales(销售量y)
1 27 52
2 11 37
3 42 64
4 33 55
5 15 29
; ; ;

(1) Referring to Table, generate the scatter plot.(画出散点图)
(2) Referring to Table, what are the values of the estimated intercept and slope(求出顾客与销售量之间的线性方程)?

Answer 1

(1)To generate the scatter plot,you shuould put the five points (27,52) (11,37) (42,64) (33,55) (15,29) into the coordinate system.
(2)preparation for the linear regression equation:
x's average=25.6；y's average=47.4；Σ(xi·yi)=6749；Σ(xi²)=3928
so:
b^=（6749-5×25.6×47.4）/（3928-5×25.6²）=681.8/651.2≈1.047
a^=47.4-1.047×25.6≈20.597
so：
y^=1.047x+20.597

Answer 2

(1)To generate the scatter plot,you shuould put the five points (27,52) (11,37) (42,64) (33,55) (15,29) into the coordinate system.
(2)preparation for the linear regression equation:
x's average=25.6；y's average=47.4；Σ(xi·yi)=6749；Σ(xi²)=3928
so:
b^=（6749-5×25.6×47.4）/（3928-5×25.6²）=681.8/651.2≈1.047
a^=47.4-1.047×25.6≈20.597
so：
y^=1.047x+20.597

Answer 3

发生的噶事地方还不够的f

Answer 4

要说统计学问题的话，你要说仇杰统计学问题，这个我也不是太懂，就是也不是很清楚，你这个统计学的题目吧！

Answer 5

这道题一般需要学校教导员来做 你们可以私下问问他