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valkas [14]
3 years ago
12

One researcher wishes to estimate the mean number of hours that high school students spend watching tv on a weekday. a margin of

error of 0.23 hour is desired. past studies suggest that a population standard deviation of 1.9 hours is reasonable. estimate the minimum sample size required to estimate the population mean with the stated accuracy.
Mathematics
2 answers:
PtichkaEL [24]3 years ago
3 0
Margin of error, e = Z*SD/Sqrt (N), where N = Sample population

Assuming a 95% confidence interval and substituting all the values;
At 95% confidence, Z = 1.96

Therefore,
0.23 = 1.96*1.9/Sqrt (N)

Sqrt (N) = 1.96*1.9/0.23

N = (1.96*1.9/0.23)^2 = 262.16 ≈ 263

Minimum sample size required is 263 students.

yawa3891 [41]3 years ago
3 0

Answer:the answer is 236 students


Step-by-step explanation:


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Ne4ueva [31]

Answer:

i think the answer is B, C and D

3 0
2 years ago
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Here are five number cards . 2,5,7,8,9 . One of the cards is removed and the mean average of the remaining four number cards is
Elodia [21]

Answer:

7

Step-by-step explanation:

Given that there are 5 number cards.

They are 2,5,7,8,9

Total of all numbers in the cards = 2+5+7+8+9= 31

One card is removed say with number x.

Now sum new would be =31-x   ..  i

Average of remaining 4 cards = 6

So sum of remaining 4 cards = 6(4) = 24 ... ii

i and ii represent the sum of remaining 4 cards. Hence they should be equal

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Subtract 31 from both sides to get

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Or x =7


7 0
3 years ago
Which function grows the fastest for large values of x? f(x)=8x f(x)=3x f(x)=4x2+3 f(x)=1.5x 20 points
Aleonysh [2.5K]
The 4 functions are:
f_1 (x) = 8x
f_2(x)=3x
f_3(x)=4x^2+3
f_4(x)=1.5 x

Let's keep in mind that for large values of x, a quadratic function grows faster than a linear function:
ax^2 \ \textgreater \  kx for large values of x

In this problem, we can see that the only quadratic function is f_3(x), while all the others are linear functions, so the function that grows faster for large values of x is
f_3(x) = 4x^2 +3
7 0
3 years ago
A clown grabbed balloons of different colors. 7/10 of the balloons are orange. 1/4 of the remaining balloons are blue. • The res
LenaWriter [7]

Answer:

The Clown grabbed 126 balloons

Step-by-step explanation:

7 0
3 years ago
What is the perimeter of rectangle QRST ?<br> If QR = 5 and RS = 10
vovikov84 [41]

The perimeter of the rectangle is all the side lengths added up

Perimeter = 5 + 10 + 5 + 10 = 30

Hope that helps!

7 0
2 years ago
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