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Anni [7]
1 year ago
8

a study timed left-handed and right-handed people to see how long it took them to hit a buzzer. the data is shown below: the six

ty right handed people had an average of 2.4 s and a standard deviation of 0.2 s. the fifty nine left handed people had an average of 2.5 s and a standard deviation of 0.5 s. the difference is -0.1 s, and the standard deviation of the matched pairs differences is 0.2 s. find an 87% confidence interval for the difference in left-handed or right-handed people. what z or t score should you use?
Mathematics
1 answer:
Effectus [21]1 year ago
8 0

The z or t score to be used is  (0.422,0.978)

How to find the critical value ?

Critical probability (p*) = 1 - (Alpha / 2), where Alpha is equal to 1 - (the confidence level / 100), is the unit statisticians use to determine the margin of error within a set of data in statistics.

The critical value for α = 0.13 is z_{c} = \frac{z_{1} - \alpha }{2}

The corresponding confidence interval is computed as shown below

CI = (X1_{1}  - X_{2}- z_{c} \sqrt{\frac{a_{1}^{2}}{n_{1} } + \frac{a_{2}^{2}}{n_{2} }}  ,  X1_{1}  - X_{2}+z_{c} \sqrt{\frac{a_{1}^{2}}{n_{1} } + \frac{a_{2}^{2}}{n_{2} }}  )

CI = (2.1 - 1.4- 1.514\sqrt{\frac{1^{2}}{37 } + \frac{0.5_{2}^{2}}{38 }}  ,  2.1  - 1.4 + 1.514 \sqrt{\frac{1^{2}}{37 } + \frac{0.5^{2}}{38 }}  )

CI = (0.422, 0.978)

0.422< mu1 - mu 2 < 0.978

To learn more about finding the critical value from the given link  

brainly.com/question/14040224

#SPJ4

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The area of the square adjacent to two sides of a right triangle are 29.25 square units and 13 units 30 POINTS
Otrada [13]

Answer:

x=6.5\ units

Step-by-step explanation:

step 1

Find the length side of the smaller square

The area of the square is equal to

A=a^{2}

so

a^{2}=13

a=\sqrt{13}\ units

step 2

Find the length side of the larger square

The area of the square is equal to

A=b^{2}

so

b^{2}=29.25

b=\sqrt{29.25}\ units

step 3

Find the value of x

Applying the Pythagoras Theorem

x^{2} =a^{2}+b^{2}

substitute the values

x^{2} =13+29.25

x^{2} =42.25

x=6.5\ units

6 0
3 years ago
A company will need 40,000 in 6 years for a new addition. To meet the goal, the company deposits money into an account today tha
NeTakaya
"<span>A company will need 40,000 in 6 years for a new addition. To meet the goal, the company deposits money into an account today that pays 4% annual intrest compund quarterly."  Let's pretend that the instructions state, "Determine the amount of money that must be deposited upfront so that you will have $40,000 in 6 years."

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Here, $40000 = P(1 + 0.04/4)^(4*6)
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Solve the system of equations. (3x + 4y = 5) (2x - 3y = -8)
vovikov84 [41]

Answer:

the solution is (-1, 2)

Step-by-step explanation:

Let's solve the system

(3x + 4y = 5)

(2x - 3y = -8)

using the method of elimination by addition and subtraction.  Notice that if we multiply all terms of the first equation by 3 and all terms of the second by 4, y as a variable will temporarily disappear:

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  8x - 12y  = -32

-----------------------

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Replacing x in the second equation by -1, we get:

2(-1) - 3y = -8, or

2 + 3y = 8,

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2 years ago
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Answer:

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