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3 years ago

Pls help I’ll brainlest and add extra points for the correct answer

Mathematics

2 answers:

marusya05 [52]3 years ago

6 0

Answer:

2x(8)

Step-by-step explanation:

multiply. 2x by 8 and get 16x

Alexandra [31]3 years ago

5 0

Answer:

2x + 8x

10x

Step-by-step explanation:

Open the brackets and multiply x inside.

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Let the sample size of leg strengths to be 7 and the sample mean and sample standard deviation be 630 watts and 32 watts, respec

Colt1911 [192]

Answer:

a. There is_sufficient evidence that the leg

C. 0.010 < P-value < 0.025

b. Power of test = 1- β=0.2066

c. So the sample size is 88

Step-by-step explanation:

We formulate the null and alternative hypotheses as

H0 : u1= u2 against Ha : u1 > u2 This is a right tailed test

Here n= 7 and significance level ∝= 0.005

Critical value for a right tailed test with 6 df is 1.9432

Sample Standard deviation = s= 32

Sample size= n= 7

Sample Mean =x`= 630

Degrees of freedom = df = n-1= 7-1= 6

The test statistic used here is

Z = x- x`/ s/√n

Z= 630-600 / 32 / √7

Z= 2.4797= 2.48

P- value = 0.0023890 > ∝ reject the null hypothesis.

so it lies between 0.010 < P-value < 0.025

b) Power of test if true strength is 610 watts.

For a right tailed test value of z is = ± 1.645

P (type II error) β= P (Z< Z∝-x- x`/ s/√n)

Z = x- x`/ s/√n

Z= 610-630 / 32 / √7

Z=0.826

P (type II error) β= P (Z< 1.645-0.826)

= P (Z> 0.818)

= 0.7933

Power of test = 1- β=0.2066

(c)

true mean = 610

hypothesis mean = 600

standard deviation= 32

power = β=0.9

Z∝= 1.645

Zβ= 1.282

Sample size needed

n=( (Z∝ +Zβ )*s/ SE)²

n= ((1.645+1.282) 32/ 10)²

Putting the values and solving we get 87.69

So the sample size is 88

5 0

3 years ago

Below are two regular polygons. Calculate the value of angle a.

kodGreya [7K]

There’s no attachment

7 0

2 years ago

If a person studies for 8hrs a week. How long to they work each day

Andrew [12]

Answer:

about and hour and 14 minutes each day

Step-by-step explanation:

just divide 8 by 7 and round to the nearest hundredths place

7 0

3 years ago

At the candy store there are 420 gumdrops and 280 chocolate bars, for a total of 700 candies all together. What is the ratio of

Mekhanik [1.2K]

Answer:

5 : 2

Step-by-step explanation:

Given that:

Number of gumdrops = 420

Number of chocolate bars = 280

Total Number of candies = 700

To find:

The ratio of candies to chocolate bars = ?

Solution:

First of all, let us discuss the method to find the ratio of any two quantities.

Suppose, we need to find the ratio of two numbers $p$ and $q$ .

Then to find the ratio $p:q$ , we need to divide p by q and represent it in the simplest form $\frac{a}{b}$ such that a and b can not be divided further.

Here, to find the ratio of candies to chocolate bar:

$Ratio = \dfrac{\text{Number of candies}}{\text{Number of chocolate bars}}\\\Rightarrow \dfrac{700}{280}$

Here, we can simplify the fraction by dividing the numerator and denominator by 10 first:

$\dfrac{70}{28}$

Now, let us divide the numerator and denominator by 14:

$\dfrac{5}{2}$

So, the ratio is 5 : 2

6 0

3 years ago

There are 3 star fighters and 10 aliens in the play space trek. Each alien costume takes 2 1/4 yards of material. How much mater

Leno4ka [110]

Answer:

22.5 yards

Step-by-step explanation:

10 costumes at 2.25 yards each is ...

10 · 2.25 = 22.5 . . . . yards of material

6 0

3 years ago