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zubka84 [21]
1 year ago
13

Baby talk: In a sample of 69 children, the mean age at which they first began to combine words was 16.44 months. with a standard

deviation of 9.47 months. Part 1 out of 2 Construct a confidence interval for the mean age at which children first begin to combine words. Round the answers to two decimal places. A 98% confidence interval for the mean age is:__________
Mathematics
1 answer:
SashulF [63]1 year ago
3 0

Answer:

A 98% confidence interval for the mean age is:

= ( 13.78, 19.10) months

Step-by-step explanation:

Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.

The confidence interval of a statistical data can be written as.

x+/-zr/√n

Given that;

Mean x = 16.44 months

Standard deviation r = 9.47 months

Number of samples n = 69

Confidence interval = 98%

z(at 98% confidence) = 2.33

Substituting the values we have;

16.44+/-2.33(9.47/√69)

16.44+/-2.33(1.140054028722)

16.44+/-2.656325886922

16.44+/-2.66

= ( 13.78, 19.10) months

Therefore, A 98% confidence interval for the mean age is:

= ( 13.78, 19.10) months

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ehidna [41]

Answer:

25%

Step-by-step explanation:

Amount Kedwin has for the purchase = $150

Total cost of purchase :

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Shipping cost = 0.1 * 175 = 17.5

Total cost =. $(175 + 17.5) = $192.5

Smallest sale rate in other to afford the item:

At 10%

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At 25%

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Hence, smallest sale rate needwd is 25%

3 0
1 year ago
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How many solutions does 20+4r=32-2r
My name is Ann [436]

Answer:

one solution : r = 2

Step-by-step explanation:

hello :

20+4r=32-2r

4r+2r = 32-20

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r=12/6 = 2

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1 year ago
How long would a line of 1 million centimetre cubes be. 
makvit [3.9K]
I hope that's what you mean - 1000000 cm cubes is equal to:

100000 meters (m)
10 kilometers (km)
100000 decimeters (dm)
10000000 milimeters (mm)
10000000000 micrometers / microns (µm)
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Is (1,8) a solution to this system of equations?<br> y = 6x + 2<br> y = x + 7<br> yes<br> no
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Yes

Explanation: y = 6x + 2
y = x + 7
Combine the equation
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Substitute x =1
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Anastaziya [24]

Answer:

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Step-by-step explanation:

Given:

Amount deposit P = $2,000

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Rate r = 5% annual = 5/4 = 1.25% (quarterly) = 0.0125

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Computation:

A = P[1+r]ⁿ

So,

Y = 2,000[1+0.0125]^{4t} \\\\Y = 2,000[1.0125]^{4t}

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