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luda_lava [24]
3 years ago
8

A simple random sample is drawn from a normally distributed population, and when making a statistical inference about the popula

tion mean, the margin of error is found to be 5.9 at a 95% level of confidence. If the mean of the sample is 18.7, what is the 95% confidence interval for the population mean?
Mathematics
2 answers:
DiKsa [7]3 years ago
3 0
<span>To find the confidence interval, add and subtract the margin of error from the mean. With mean 18.7 and margin of error 5.9, you have 95% confidence the answer is between 12.8 and 24.6.</span>
V125BC [204]3 years ago
3 0

Answer:

B. 18.7 ± 9.7

Step-by-step explanation:

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Regina has a bag of marbles that contains 3 blue marbles, 4 red marbles, and 5 yellow marbles. She draws one marble, then replac
iVinArrow [24]

Answer:  

Possible outcomes=12

P(\text{Blue marble first})=\frac{1}{4}

P(\text{Yellow marble})=\frac{5}{12}

P(\text{ Blue then yellow})=\frac{5}{48}

Step-by-step explanation:

We can see these two events are independent as Regina replaced marble after drawing one marble.

We can find possible outcomes by adding number of blue, red and yellow marbles.

\text{Possible outcomes}=3+4+5=12

Let us find probability of getting a blue marble on first draw.

P(\text{Blue marble})=\frac{3}{(3+4+5)} =\frac{3}{12} =\frac{1}{4}

Now we will find probability of getting yellow marble.

P(\text{Yellow marble})=\frac{5}{(3+4+5)} =\frac{5}{12}

We can find probability of getting a blue marble and then yellow marble by multiplying both probabilities.

P(\text{ Blue then yellow})=\frac{1}{4}* \frac{5}{12} =\frac{5}{48}

Therefore, probability of getting a blue marble and then yellow marble is \frac{5}{48}.

6 0
4 years ago
Read 2 more answers
•Pls help•
nata0808 [166]

Answer:

The order of operations says that operations must be done in the following order: parentheses, exponents, multiplication, division, addition, and subtraction. You can also create a little phrase to go along with this, like "Please Excuse My Dear Aunt Sally." Whatever you choose, make sure that you know all six steps of the order of operations very well. The order of operations tells us the order to solve steps in expressions with more than one operation. First, we solve any operations inside of parentheses or brackets. Second, we solve any exponents. Third, we solve all multiplication and division from left to right.

Step-by-step explanation:

hope this helps :)

3 0
2 years ago
The width of a rectangle measures (2.3a + 9.9) centimeters, and its length
gladu [14]

Answer:

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Step-by-step explanation:

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3 years ago
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stira [4]
T=b+2c+3j, if b,c,j are 8,3,4 respectively

t=8+2(3)+3(4)

t=8+6+12

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So they chop down 26 trees.
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3 years ago
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The second one because 4d x c is the correct answer
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