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r-ruslan [8.4K]
3 years ago
15

Brad sold candy bars and cookies for a fundraiser at school. Candy bars sold for $3, and cookies sold for $5. He sold a total of

20 items and made $76. How many candy bars did Brad sell? 12 14 16 18
Mathematics
1 answer:
sergejj [24]3 years ago
7 0
He would’ve sold 12 candy bars.

12x3=36

He only sold 20 items so that leaves 8 cookies

5x8=40

40+36=76$
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.A variety of stores offer loyalty programs. Participating shoppers swipe a bar-coded tag at the register when checking out and
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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:

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

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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:

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Jadi jumlah derajat tidak masalah. Mereka masih akan menempuh jarak yang sama.

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Marina berjalan sejauh 80 km

Dumai berjarak 96 km

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