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Mathematics 7 Online
OpenStudy (anonymous):

Can someone please help me with two questions ?????

OpenStudy (ilovecake):

sure

OpenStudy (anonymous):

Thank you ... Question 1 . Johnny has been planting blueberries in a garden in his backyard. Johnny started with blueberries in one square foot of garden modeled by the function s(x) = 10. He is allowed to convert more of the garden, and each additional square foot he maintains allows his blueberry plants to produce more by a rate of a(x) = 1.4x-2. Explain to Johnny how to create an equation to predict the number of blueberries he can expect based on the number of square feet he maintains. Describe how to determine the number of blueberries he will grow with 5 square feet. Use complete sentences.

OpenStudy (anonymous):

@Ilovecake just letting you know it there

OpenStudy (ilovecake):

s(x) = 10 a(x) = 1.4x-2 <---- rate by which a blue berry production increases per plant a(x) = 1.4x-2 <---- rate by which a blue berry production increases per sqr foot* s(x) + s(x) * a(x) = Total production ^--- starting with this no matter what increasing by a(x) factor on what he can produce at first so s(x) * a(x) a(x)=1.4x−2

OpenStudy (anonymous):

so will it be 10+10*1.4x-2

OpenStudy (anonymous):

am I pluging in ?

OpenStudy (ilovecake):

yep :)

OpenStudy (anonymous):

okay so the first thing I will write is 10+10*1.4x-2 which will be 22

OpenStudy (ilovecake):

yes

OpenStudy (anonymous):

lol okay and I just add the information you gave me .... can I ask my other question

OpenStudy (ilovecake):

yes

OpenStudy (ilovecake):

Go ahead and post it

OpenStudy (anonymous):

Sam needs to study a possible link between anti-inflammatory drugs and heart disease. Help Sam design a study that would be appropriate. Explain the type of study, the sampling method, the parameter of interest, and the statistic he could use to estimate that parameter. What conclusions would Sam be able to draw from this study?

OpenStudy (anonymous):

@Ilovecake

OpenStudy (ilovecake):

I am still here

OpenStudy (anonymous):

lol just making sure , sorry

OpenStudy (ilovecake):

Okay, you can do an experimental study, take 100 people who are known to have heart disease and divide them randomly into two groups, 50 get the anti-inflammatory drug, and 50 get a placebo pill. You expect that in the treatment group (the group that received the real pill) , there will be a higher proportion of successes than in the control group (the group that received the sugar pill). And you can do hypothesis testing to determine if there is a significant difference (the difference in the proportions is unlikely due to chance). And you can do hypothesis testing to determine if there is a significant difference. (The difference in the proportions is unlikely due to chance). So basically you take a sample of people whose hearts are failing. and you want to know if their hearts would improve if they took anti-inflammatory drugs.So the population of interest is all humans with heart disease. It might turn out , surprisingly, that anti-inflammatory drugs make heart disease worse in your sample study than compared to placebo. But you don't expect that to happen. It could happen due to chance, but its very unlikely. That's why statistical theory is important to determine how unlikely it would be to get the results you did, under the assumption there is no difference if you take inflammatory drugs or not (null hypothesis).

OpenStudy (ilovecake):

Do you get it?

OpenStudy (ilovecake):

@mgarrick7 are you there? Did you read it?

OpenStudy (anonymous):

i got disconnected

OpenStudy (anonymous):

Yes I understand It , I wanna thank you so much . how long will you be online:?

OpenStudy (ilovecake):

I will be online the whole day until 2:30 - 3:00

OpenStudy (anonymous):

okay you mind if I ask you more questions ?

OpenStudy (ilovecake):

Right now?

OpenStudy (anonymous):

yes , if you are not busy?

OpenStudy (ilovecake):

well I was gonna go on a walk in 10 min. but sure

OpenStudy (anonymous):

lol i'm sorry

OpenStudy (ilovecake):

No it is fine. Go ahead and post the question.

OpenStudy (anonymous):

I'll close this one so i can give you another medal

OpenStudy (ilovecake):

okay. :)

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