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Over [174]
2 years ago
5

Jack was out at a restaurant for dinner when the bill came. His dinner came to $14. He wanted to leave a 31% tip. How much was h

is meal plus the tip, before tax, in dollars and cents?
Help please I wasn’t here for this!!!
Mathematics
2 answers:
inessss [21]2 years ago
8 0

Answer:

$18.34

Step-by-step explanation:

Degger [83]2 years ago
8 0

Answer:

The tip total is $4.45. The total of the bill + tip is $18.34.

Step-by-step explanation:

Please mark me brainliest if I helped!

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Answer:

t=(15-1) [\frac{0.219}{0.2}]^2 =16.7864

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And the 2 is because we are conducting a bilateral test.

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Step-by-step explanation:

Data given

\mu=7 population mean (variable of interest)

\sigma=0.2 represent the population standard deviation

s=0.219 represent the sample deviation

n=15 represent the sample size

\alpha=0.05,0.01 represent the values for the significance level  

Hypothesis test

On this case we want to check if the population standard deviation is equal or not to 0.2, so the system of hypothesis are:

H0: \sigma = 0.2

H1: \sigma \neq 0.2

In order to check the hypothesis we need to calculate the statistic given by the following formula:

t=(n-1) [\frac{s}{\sigma_o}]^2

This statistic have a Chi Square distribution distribution with n-1 degrees of freedom.

What is the value of your test statistic?

Now we have everything to replace into the formula for the statistic and we got:

t=(15-1) [\frac{0.219}{0.2}]^2 =16.7864

P value

We know the degrees of freedom of the distribution 14 on this case and we can find the p value like this:

p_v = 2*P(\chi^2_{14}>16.786)=0.5355

And the 2 is because we are conducting a bilateral test.

\alpha=0.05 since the the p_v >0.05 we fail to reject the null hypothesis.

\alpha=0.01 since the the p_v >0.01 we fail to reject the null hypothesis.

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