Please help me .....

Mathematics

2 answers:

o-na [289]3 years ago

7 0

It might be the first box, because i had that same question on my hw this year, lol what a coincidence

r-ruslan [8.4K]3 years ago

3 0

Y = 3.75x + 15

graph starts at (0,15) increases at a rate of 3.75 $/smoothie.

try x = 4 smoothies since units of x go by 4's
y = 3.75(4) + 15
y = 15 + 15
y = 30

next point is (4,30) first graph is correct.

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lord [1]

Answer:

a) [24.114,29.2858]

b) Since 30 is not in the 95% confidence interval, there is a 95% probability that 30 is not the true mean WEP

Step-by-step explanation:

The 95% confidence interval is given by the interval

$\bf [ \bar x-z^*\frac{s}{\sqrt n}, \bar x+t^*\frac{s}{\sqrt n}]$

where

$\bf \bar x$ = 26.7 is the sample mean

s = 17.7 is the sample standard deviation

n = 180 is the sample size

Since the sample size is big enough, we can use the Normal N(0,1) to compute $\bf z^*$ and it would be 1.96(*) (a value such that the area under the Normal curve outside the interval [-z, z] is 5% (0.05))