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3 years ago

24 POINTS lots of points PLEASE Answer the following correctly please need help

Mathematics

2 answers:

choli [55]3 years ago

4 0

4 quizzes are taken

yarga [219]3 years ago

3 0

Answer:

4 quizzes are taken per week

Step-by-step explanation:

12/3=4

20/5=4

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The sum of two numbers is 30 and their

Artyom0805 [142]

Answer:

False

Step-by-step explanation:

first step is

x+y = 30

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3 years ago

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3 years ago

Andrew and Griffin both worked hard over the weekend. Together they earned a total of $65. Griffin earned $15 more than Andrew.

Leviafan [203]

Answer:s

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Step-by-step explanation:

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3 years ago

Two parallel lines are cut by a transversal. What is the measure of 28?

True [87]

Answer:

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3 years ago

Read 2 more answers

A physicist examines 28 sedimentary samples for mercury concentration. The mean mercury concentration for the sample data is 0.8

fiasKO [112]

Answer: $0.861$

Step-by-step explanation:

The confidence interval for population mean $(\mu)$ is given by :-

$\overline{x}\pm t_c\dfrac{s}{\sqrt{n}}$ , where n=sample size

$\overline{x}$ = sample mean

$s$ =sample standard deviation

$t_c$ = critical t-value (for two tailed )

Let $\mu$ be the confidence interval for the population mean mercury concentration.

As per given , we have

Sample size : n= 28

degree of freedom = 27 [df=n-1]

Sample mean : $\overline{x}=0.863$ cc/cubic meter

Sample standard deviation : s= 0.0036

Significance level : $\alpha=1-0.98=0.02$

Critical two-tailed test value :

$t_c=t_{\alpha/2,df}=t_{0.01,\ 27}= 2.473$ (Using t-distribution table.)

We assume the population is approximately normal.

Now, the 98% confidence interval for the population mean mercury concentration will be :-

$0.863\pm (2.473)\dfrac{0.0036}{\sqrt{28}}\\\\=0.863\pm(0.002)\\\\=(0.863-0.002,\ 0.863+0.002)=(0.861,\ 0.865)$

Required confidence interval : $0.861$

4 0

3 years ago