Answer: c. 3.01
Step-by-step explanation:
The test statistic for difference between two population mean (when population standard deviation is known) is given by :
, where 
= Size of first sample
= Size of second sample
= Difference between two sample mean.
= standard deviation for population 1.
= standard deviation for population 2.
As per given , we have
Substitute these values in formula , we get
Hence, the value of the test statistic is <u>3.01</u>.
Hence, the correct option is c. 3.01 .
Answer:
x = -1.75 , +/- 1.1892i.
Step-by-step explanation:
4x5 + 7x4 + 36x + 63) = (4x + 7)
4x^5 + 7x^4 + 32x + 56 = 0
x^4(4x + 7) + 8(4x + 7) = 0
(x^4 + 8) = 0 or 4x + 7 = 0
4x + 7 = 0
x = -1.75.
4x^4 = -8
x^4 = -2
x = +/- ⁴√-2
x = +/- 1.1892 i.
