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Vesnalui [34]
3 years ago
12

Please I need help on these two

Mathematics
1 answer:
KIM [24]3 years ago
5 0

Question 1: C, x < -8      <---

Question 2: A, n>= -4

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Quarters are currently minted with weights normally distributed and having a standard deviation of 0.065. New equipment is being
Ilya [14]

Answer:

Yes, the new equipment appear to be effective in reducing the variation of​ weights.

Step-by-step explanation:

We are given that Quarters are currently minted with weights normally distributed and having a standard deviation of 0.065.

A simple random sample of 25 quarters is obtained from those manufactured with the new​ equipment, and this sample has a standard deviation of 0.047.

Let \sigma = <u><em>standard deviation of weights of new equipment.</em></u>

SO, Null Hypothesis, H_0 : \sigma \geq 0.065      {means that the new equipment have weights with a standard deviation more than or equal to 0.065}

Alternate Hypothesis, H_A : \sigma < 0.065      {means that the new equipment have weights with a standard deviation less than 0.065}

The test statistics that would be used here <u>One-sample chi-square</u> test statistics;

                           T.S. =  \frac{(n-1)s^{2} }{\sigma^{2} }  ~ \chi^{2}__n_-_1

where, s = sample standard deviation = 0.047

           n = sample of quarters = 25

So, <u><em>the test statistics</em></u>  =  \frac{(25-1)\times 0.047^{2} }{0.065^{2} }  ~  \chi^{2}__2_4   

                                     =  12.55

The value of chi-square test statistics is 12.55.

Now, at 0.05 significance level the chi-square table gives critical value of 13.85 at 24 degree of freedom for left-tailed test.

Since our test statistic is less than the critical value of chi-square as 12.55 < 13.85, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which <u><em>we reject our null hypothesis</em></u>.

Therefore, we conclude that the new equipment have weights with a standard deviation less than 0.065.

5 0
3 years ago
I need help correct gets crown answer quick!
Ne4ueva [31]

Answer:

6,7, and 10

Step-by-step explanation:

If this answer helped you then please mark it as brainliest so I can get to the next rank

8 0
2 years ago
Read 2 more answers
BRAINLIESTTT ASAP!!!!!<br> HELP PLEASE!!! I’ll appreciate it so much!
dezoksy [38]
100% + 1.8% = 101.8%
101.8% = 101.8/100 = 1.018

1) 450 * 1.018 = 458.10   in one month
2) 458,1 * 1.018 ≈ 466.35   in two months
3) 466,35 * 1.018 ≈ 474.74   in three months
4) 474,74 * 1.018 ≈ 483.29   in four months
.........................................

Answer: D.
6 0
3 years ago
How to add a + b using 45a +90b
yulyashka [42]

Answer:

45(a + 2b)

Step-by-step explanation:

45a

step1 in order to factor an integer, we need to repeatedly divide it by the ascending sequence of primes (2, 3, 5...) The number of times that each prime divides the original integer becomes its exponent in the final result

Prime number 3 to the power of 2 equals 9 .

Prime number 5 to the power of 1 equals 5 .

3x^{2} *5

90b

do the same as above

 Prime number 2 to the power of 1 equals 2 .

    Prime number 3 to the power of 2 equals 9 .

    Prime number 5 to the power of 1 equals 5 .

3x^{2} *5*2

3 0
3 years ago
5 tenths plus 7 thousandths equals how many thousandths
elixir [45]
0.5 + 0.007 = 0.012
So the answer is 12 thousandths

4 0
3 years ago
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