Answer:
(-9)(2)= -18
Step-by-step explanation:
since there are no signs in this expression, we will multiply. always remember, a negative times a positive will always be negative. just multiply 9 and 2 and you get 18. then add a negative sign. -18
Let x = 78.3
y = 87.2
σₓ = 5.6 and σ₍y₎ = 6.3
number of pieces n = 50
z = z-score value =1.96 in this case
<span> A 100(1-α)%
confidence interval for the difference in large sample means is:
(x – y) ± z x </span>√( σₓ² / n+ σ₍y₎²<span>/n)
by putting the values,
=(78.3-87.2) </span>± 1.96 x √(5.6² /50 + 6.3² /50)<span>
</span><span>= -8.9 ± 2.34
</span><span>= [-11.24, -6.56]</span>
You can see the picture for the steps but I’m sure the answer is -72
Answer: f u
Step-by-step explanation: your garbo