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konstantin123 [22]

4 years ago

9

250 tickets are sold at a church fundraiser. if sara buys 15 tickets the probability the probability that she will win the prize

quilt is

1 answer:

laila [671]4 years ago

3 0

<span>the probability the probability that she will win the prize quilt:
= 15/250
= 0.06
= 6%

</span>

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Excel's __________ function can be used to calculate a p-value for a hypothesis test when σ is unknown. a. RAND b. T.DIST c. NOR

alisha [4.7K]

Answer:

b. T.DIST

Step-by-step explanation:

Previous concepts

The t distribution (Student’s t-distribution) is a "probability distribution that is used to estimate population parameters when the sample size is small (n<30) or when the population variance is unknown".

The shape of the t distribution is determined by its degrees of freedom and when the degrees of freedom increase the t distirbution becomes a normal distribution approximately.

The degrees of freedom represent "the number of independent observations in a set of data. For example if we estimate a mean score from a single sample, the number of independent observations would be equal to the sample size minus one."

Solution to the problem

a. RAND

False, since this function is to generate a random number between 0 and 1. And is not used to calculate p values

b. T.DIST

Correct, since th population deviation is unknown and if we find the degrees of freedom we can calculate the p value with this function.

c. NORM.S.DIST

False, because this is in order to calculate the p value when the population deviation is given $\sigma$

d. Not enough information is given to answer this question.

False we have enough info to conclude this.

6 0

4 years ago

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Given that when x is reduced by 17% the answer is y, express x in terms of y.

Dima020 [189]

X - 0.17 = y

add 0.17 to both sides

x = y + 0.17

3 0

4 years ago

A square patio has an area of 200 square feet how long is each side of the patio to the nearest 10th

shtirl [24]

The area of a square is equal to length times width, which are the same.

200= x^2

Root both sides

x= root 200
x= approx. 14.1

Final answer: 14.1 ft

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3 years ago

Solve for x . Round to the nearest tenth, if necessary.

Jet001 [13]

Answer:

x = 24.1

Step-by-step explanation:

Since this is a right triangle, we can use trig functions

tan theta = opp /adj

tan 15 = x/90

90 tan 15 =x

x=24.11542

To the nearest tenth

x = 24.1

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3 years ago

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(X^2+y^2)^2 polynomial identify. Simplify

Alexxx [7]

Answer:

$(x^{2}+ y^{2})^{2} =x^{4}+2x^{2}y^{2}+y^{4}$

Step-by-step explanation:

(X^2+y^2)^2 polynomial identify. Simplify

i.e

$(x^{2}+ y^{2})^{2} = ?$

Solution:

We have the identity,

$(A+B)^{2}=A^{2}+2AB+B^{2}$

In the Question

$A=x^{2}$

$B=y^{2}$

Substituting in the identity we get

$(x^{2}+ y^{2})^{2} =(x^{2})^{2}+2(x^{2})(y^{2})+(y^{2})^{2}$

Also we have

$(x^{a})^{b} =x^{a\times b}$

$(x^{2}+ y^{2})^{2} =x^{4}+2x^{2}y^{2}+y^{4}$ Which is the required

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4 years ago