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stealth61 [152]
2 years ago
9

Pls help i cant get this question :(

Mathematics
1 answer:
sukhopar [10]2 years ago
3 0

Answer:

A

Step-by-step explanation:

X<2

Everything before 2 on the X-Axis will be shaded.

< are broken lines, ≤ are solid lines.

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4 0
3 years ago
.A variety of stores offer loyalty programs. Participating shoppers swipe a bar-coded tag at the register when checking out and
Leni [432]

Answer:

a) Null hypothesis:\mu \leq 120  

Alternative hypothesis:\mu > 120  

b) t=\frac{130-120}{\frac{40}{\sqrt{80}}}=2.236  

The degrees of freedom are given by:

df = n-1 = 80-1=79

The p value for this case taking in count the alternative hypothesis would be:

p_v =P(t_{79}>2.236)=0.0141  

Step-by-step explanation:

Information given

\bar X=130 represent the sample mean for the amount spent each shopper

s=40 represent the sample standard deviation

n=80 sample size  

\mu_o =120 represent the value to verify

t would represent the statistic    

p_v represent the p value f

Part a

We want to verify if the shoppers participating in the loyalty program spent more on average than typical shoppers, the system of hypothesis would be:  

Null hypothesis:\mu \leq 120  

Alternative hypothesis:\mu > 120  

The statistic for this case would be given by:

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}} (1)  

Replacing the info given we got:

t=\frac{130-120}{\frac{40}{\sqrt{80}}}=2.236  

The degrees of freedom are given by:

df = n-1 = 80-1=79

The p value for this case taking in count the alternative hypothesis would be:

p_v =P(t_{79}>2.236)=0.0141  

5 0
3 years ago
a class survey showed 8 out of 25 students had plans to travel over spring break. how many students out of the 400 students in t
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Traveling : total
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x : 400 

25 x 4 = 400 so 8 x 4 = 40 so the answer is 40. 
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Solve -5/12 multiplied by 12 =
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-5/12 multiplied by 12 is 5
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