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3 years ago

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Sarah predicts that 15 percent of all the birds she spots while bird watching will be robins. At the end of the day, she records

that 10 out of the 25 birds she spotted were robins. How does Sarah’s prediction compare with the actual results?

1 answer:

Mashutka [201]3 years ago

8 0

We can turn the probability 10 out of 25 as percentage

$\frac{10}{25}$ ×100=40%

The actual result is higher than prediction

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Let event Aequalssubject is telling the truth and event Bequalspolygraph test indicates that the subject is lying. Use your own

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Answer:

P( B | A) will actually be the probability of the polygraph test being wrong.

Step-by-step explanation:

The event A represents the event that the subject is telling the truth.

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The notation P( B | A) describes the probability that the subject fails the polygraph test given that he is actually telling the truth.

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2 years ago

Which expression is equivalent to 4(2w + 3) + 2(3 + w)?

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2 years ago

Read 2 more answers

A survey of 1 comma 558 randomly selected adults showed that 522 of them have heard of a new electronic reader. The accompanying

sineoko [7]

Answer with explanation:

Let p be the proportion of adults have heard of the new electronic reader.

Given claim : The accompanying technology display results from a test of the claim that 38% of adults have heard of the new electronic reader.

i.e. $p=0.38$

Then , the set of hypothesis will be :-

$H_0: p=0.38\\\\H_a:p\neq0.38$

Since, the alternative hypothesis is two tailed , so the test is two-tailed test.

Also, it is given that the sample size : $n=1558$

Number of adults showed that they have heard of a new electronic reader=522

So the sample proportion for adults have heard of the new electronic reader : $\hat{p}=\dfrac{522}{1558}\approx0.34$

The test statistic for proportion is given by :-

$z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}\\\\\\\Rightarrow\ z=\dfrac{0.34-0.38}{\sqrt{\dfrac{0.38(1-0.38)}{1558}}}\\\\\\\Rightarrow\ z=-3.25279036541\approx-3.25$

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3 years ago

Each week mrs endo bikes 0.86 mile to the garden. Then she bikes 2.3 miles along the river back home. About how many miles will

MAXImum [283]

Answer: 164.32 miles

Step-by-step explanation:

Given that:

Weekly coverage :

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Miles biked along the river back home =. 2.3 miles

Total miles biked weekly:

(0.86 + 2.3) miles = 3.16 miles weekly

Number of weeks per year = 52

Miles biked yearly : (number of weeks per year * miles biked weekly)

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= 164.32 miles

Mrs endo will bike about 164.32 miles in a year.

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2 years ago