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3 years ago

I forgot how to do most of this yet they gave it to me as hw ‍♀️

Mathematics

2 answers:

svp [43]3 years ago

8 0

18.

-2(-9)+3

18+3

Explanation: -2(-9) When multiplying numbers that have both a negative sign, the answer is positive. Multiply normally.

19.

-6(-4)0

24(0)

Explanation: -6(-4) As I explained before, the answer would be positive.

24(0) Every number multiplied by 0 is 0.

20.

56+(-7)

Explanation: 56+(-7) Any problem like this is just basically going to be 56-7.

21.

-36+(-4)

-40

Explanation: -36+(-4) You are simply adding normally then adding the sign. This will only work if the signs are the same. (Signs are positive and negative.)

maw [93]3 years ago

4 0

When using negatives for problems such as these, remember three things!

1.) Two "-" signs that are sitting next to each other will always change into a "+" sign.

For example, 4 - (-5) = ? The two "-" signs in between the 4 and 5 become a positive number. It ALWAYS does!

2.) The bigger the number with the negative sign, then the answer will become negative in the end.

For example, 7 - 10 = ? (OR -10 + 7 = ?) The biggest number with the negative sign is "10". Therefore the answer will become negative. When you place -10 on a number line (Number Line is from -10 to 0), add 7 to that -10. This means move 7 spaces to the right since it's a positive 7.

-10, -9, -8, -7, -6, -5, -4, -3....You moved 7 spaces to the right. Now you see your answer is negative 3.

3.) If both numbers are negative and you're <u>adding them</u>, your answer will ALWAYS be negative.

For example, -6 + -7 = ? (This is the same as -6 - 7) Look at these expressions as if you're adding them. 6 + 7 = 13. Now just add the negative sign. -6 - 7 = -13. That would be the answer.

Hope this helps!

Let me know if you need help solving the other problems. I'll gladly explain.

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The hypothesis H0: \mu=350H 0 : μ = 350 versus H_a:\mu<350H a : μ < 350 are examined using a sample of size n = 20. The on

Zolol [24]

Answer:

The statistic for this case is given $t =-1.68$

The degrees of freedom are given by:

$df =n-1= 20-1=19$

Since is a one-side lower test the p value would given by:

$p_v =P(t_{19}$

Step-by-step explanation:

Data given and notation

$\bar X$ represent the sample mean

$s$ represent the sample standard deviation

$n=20$ sample size

$\mu_o =350$ represent the value that we want to test

$\alpha$ represent the significance level for the hypothesis test.

z would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean is lower than 350, the system of hypothesis are :

Null hypothesis: $\mu \geq 350$

Alternative hypothesis: $\mu < 350$

Since we don't know the population deviation, is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:

$t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}$ (1)

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

The statistic for this case is given $t =-1.68$

P-value

The degrees of freedom are given by:

$df =n-1= 20-1=19$

Since is a one-side lower test the p value would given by:

$p_v =P(t_{19}$

5 0

3 years ago

I need to know this

kondor19780726 [428]

Answer:

C. 26 to 29

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Step-by-step explanation:

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3 years ago

Find the mean, variance, and standard deviation of the binomial distribution with the given values of n and p. , The mean, ,

klemol [59]

Complete Question

Find the mean, variance, and standard deviation of the binomial distribution with the given values of n and p. , The mean, , is nothing. (Round to the nearest tenth as needed.)

p = 0.6 n = 18

Answer:

The mean $\mu = 10.5$