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ikadub [295]
2 years ago
5

EXPERT HELP: EXPLAIN THE ANSWER AND DON'T GUESS

Mathematics
2 answers:
Yuki888 [10]2 years ago
8 0

Answer:

The mean for Brand B is higher than the mean for Brand A.

Step-by-step explanation:

The mean is the average. The average is found by adding all the numbers together, and dividing by the number of numbers.

There are 10 dots on each plot.

BRAND A: 1000+(1100•2)+(1200•3)+(1300•4) = 12,000

Divide by 10.

BRAND A MEAN: 1,200

BRAND B: 1400+(1500•4)+(1600•2)+)1700+1800+1900= 16,000

Divide by 10.

BRAND B MEAN: 1,600

exis [7]2 years ago
3 0

Answer:

A or C

Step-by-step explanation:

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tatiyna
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8 0
3 years ago
Consider the following data set. The data were actually collected in pairs, and each row represents a pair.
Anna11 [10]

Answer:

Step-by-step explanation:

Hello!

a.

Using the data sets you have to analyze them as if they are two independent samples.

The hypotheses are:

H₀: μ₁=μ₂

H₁: μ₁≠μ₂

α: 0.05

Assuming that both data sets are from a normal distribution and both population variances, although unknown, are equal, the statistic to use is:

t=\frac{(X[bar]_1-X[bar]_2)-(Mu_1-Mu_2)}{Sa\sqrt{\frac{1}{n_1} +\frac{1}{n_2} } } ~~t_{n_1+n_2-2}

Sa^2= \frac{(n_1-1)S^2_1+(n_2-1)S^2_2}{n_1+n_2-2}

Sa^2= \frac{9*5.38+9*3.65}{10+10-2} =4.51

Sa= 2.12

t_{H_0}= \frac{(49.69-50.52)-0}{2.12*\sqrt{\frac{1}{10} +\frac{1}{10} } } = -0.875

The p-value for the two-tailed test is:

P(t_{18}≤-0.875) + P(t_{18}≥0.875)= P(t_{18}≤-0.875) + (1 - P(t_{18}≤0.875))= 0.1965 + ( 1 - 0.8035)= 0.393

Since there is no significant level I determined it at 5%, comparing it to the p-value, the hypothesis test is not significant. Meaning that the difference between the population means of both groups is equal to zero.

b.

Considering the given data as a paired sample, you have to determine the variable difference to conduct the test:

Xd: the difference between X₁ and X₂

Before the sample mean and sample standard deviation you have to calculate the difference between the observations of group 1 and group 2. (2nd attachment)

Mean X[bar]d= -0.83

Standard deviation Sd= 1.28

The hypotheses for the paired sample test are:

H₀: μd=0

H₁: μd≠0

α: 0.05

t= \frac{X[bar]d-Mud}{\frac{Sd}{\sqrt{n} } } ~~t_{n-1}

t_{H_0}= \frac{-0.83-0}{\frac{1.28}{ \sqrt{10} }} = -2.05

The p-value for the two-tailed test is:

P(t_{9}≤-2.05) + P(t_{9}≥2.05)= P(t_{9}≤-2.05) + (1 - P(t_{9}≤2.05))= 0.0353 + (1 - 0.9647)= 0.0706

Comparing the p-value with the significance level, the hypothesis test is not significant. Meaning that the population mean of the difference between group 1 and group 2 is equal to cero. There is no difference between the two groups.

c.

The value of the statistic in "a" is greater than the value of the statistic obtained in "b". Since there are two samples used an "a" the degrees of freedom of the test are the double as the ones used in "b". The p-value obtained in "b" is around half of the p-value of "a".

The main difference is that in "a" you compared two different samples but in "b" you compared two dependent samples when analyzing paired data the "effect of the individual" is removed from the equation.

I hope this helps!

3 0
3 years ago
20 Points.
AVprozaik [17]

Answer:

d and b

Step-by-step explanation:

d and b

8 0
2 years ago
Shrinivas deposited $1300 in an account which pays 8% annual interest, compounded continuously. How long will it take to reach $
sertanlavr [38]

Answer: a. 12.4 years

Step-by-step explanation:

Function to represent exponential growth continuously:

A=A_0e^{rt}  ...(i)

, where A_0 = initial amount, r= rate of interest ( in decimal) , A = Amount after t years.

As per given , we have

A_0=\$1300\\\\r=8\%=0.08\\\\ A=\$3500

To find : t

Put all values in (i) ,

3500=(1300)e^{0.08t}\\\\\Rightarrow\ 2.6923077=e^{0.08t}

Taking natural log on both sides

\ln(2.6923076)= 0.08t\\\\\Rightarrow\ 0.99039867=0.08t\\\\\Rightarrow\ t=\dfrac{0.99039866}{0.08}=12.37998325\approx12.4

Hence, it would take <u>12.4</u> years.

so, the correct option is a. 12.4 years .

8 0
3 years ago
Jack added 6.5 sales tax to the price, , of a new cell phone. What is another way to find the total cost of the cell phone?
stich3 [128]
Anwser:


Well first of all, I would need the original price of the cell phone to calculate this, so yeah
4 0
3 years ago
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