Help please ?? People say it’s hard and it is so help

Mathematics

1 answer:

iren2701 [21]3 years ago

4 0

Hi, I’d be glad to help you out today, my name is Delicia, Jessie’s friend, in my icon I have set for brainly.

Okay right off the bat, I can see the slope, which is .75x because the key word in this sentence is “Each”. This means buying a certain amount of tickets gives us a variable!!

In order for her to get into the fair, she has to pay one time fee, which is 12

The equation for this relationship is y=mx+b

y= the cost
mx=slope
+b=y-intercept

y= 0.75x + 12 is your answer to 4a.

.75x is your answer to 4b

12 is your answer to 4c

4d is being too vague for this question. The person who made this assignment wrote is very poorly.

4d (I used all my notes from 5th grade to figure this out)

4d- The graph represents positive correlation (positively increasing) that is growing at a constant rate. For every 1-unit increase in x, there is a 1-unit increase in y. The rate between the cost and the amount of tickets bought is constantly growing for every x value.

Please take time to either give this the brainliest or heart my answer!!!

For further information, please contact my friend and I on Instagram.

@jessmyybest

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A survey shows that college students spend on average about $20 per month on Yum Good Ramen. a. Assume that the survey was condu

lawyer [7]

Answer:

a) The 95% confidence interval would be given by (19.168;20.832)

b) The 95% confidence interval would be given by (19.182;20.416)

c) The 95% confidence interval would be given by (19.412;20.588)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean

$\mu$ population mean (variable of interest)

$\sigma$ represent the population standard deviation

n represent the sample size

Part a

The confidence interval for the mean is given by the following formula:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.025,0,1)".And we see that $z_{\alpha/2}=1.96$