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3 years ago

2. Please explain WHY those are the answers

1 answer:

6 0

A is a parameter as it is a numerical value that represents one set of data

B is a statistics as the numerical value represents the outcome of varying data results of a situation

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Listed below are the lead concentrations in mu ??g/g measured in different traditional medicines. Use a 0.10 0.10 significance l

laiz [17]

Answer:

We conclude that the mean lead concentration for all such medicines is less than 17 mu.

Step-by-step explanation:

We are given below are the lead concentrations in mu;

6.5 18.5 21.5 5.5 8.5 4.5 4.5 17.5 15.5 20

We have to test the claim that the mean lead concentration for all such medicines is less than 17 mu.

Let $\mu$ = mean lead concentration for all such medicines.

So, Null Hypothesis, $H_0$ : $\mu$ = 17 mu {means that mean lead concentration for all such medicines is equal to 17 mu}

Alternate Hypothesis, $H_A$ : $\mu$ < 17 mu {means that the mean lead concentration for all such medicines is less than 17 mu}

The test statistics that would be used here One-sample t test statistics as we don't know about population standard deviation;

T.S. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n}}}$ ~ $t_n_-_1$

where, $\bar X$ = sample mean lead concentration = $\frac{\sum X}{n}$ = 12.25 mu

s = sample standard deviation = $\sqrt{\frac{\sum (X-\bar X)^{2} }{n-1} }$ = 6.96 mu

n = sample size = 10

So, test statistics = $\frac{12.25 -17}{\frac{6.96}{\sqrt{10}}}$ ~ $t_9$

= -2.16

The value of t test statistics is -2.16.

Now, the P-value of the test statistics is given by the following formula;

P-value = P( $t_9$ < -2.16) = 0.031

Now, at 0.10 significance level the t table gives critical value of -1.383 for left-tailed test. Since our test statistics is less than the critical value of t as -2.16 < -1.383, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which we reject our null hypothesis.

Therefore, we conclude that the mean lead concentration for all such medicines is less than 17 mu.

7 0

3 years ago

The number z and −1.9 are additive inverses.

tia_tia [17]

Additive inverses are numbers that add up to zero, such as 1 and -1. Z is the additive inverse of -1/9, so z is 1.9.

1.9 + -1.9 =0.

Drag the -1.9 icon to just one mark to the right of -2 on the number line, since each dash equals 0.1. Drag z to just one mark to the left of 2 on the number line.The sum will be zero, so drag the sum icon to 0 on the number line.

3 0

3 years ago

Read 2 more answers

PLEASE HELP ASAP! THIS IS TIMED! WILL MARK BRAINLIEST IF ANSWER IS CORRECT!

IgorC [24]

Answer:

Step-by-step explanation:

A compound interest will make much more money in the long term than simple interest. Moreover the name compound gives you the answer already.

Have a great day <3

8 0

3 years ago

The measure of angle A is 30 degrees, and the measure of angle B is 124 degrees. Triangle A B C What is the measure of angle C i

ZanzabumX [31]

Answer:

The angle would measure to 26

Step-by-step explanation:

This is because the degrees in the triangle added up have to equal 180.

Step 1: add the existing degrees

124+30= 154

Step 2: do 180 - the sum

180-154 = 26

Therefore the answer is 26

3 0

3 years ago

John bought two 5 pounds bags of candy to share with classmates. If there are 25 students in john's class, how much candy will e

SpyIntel [72]

0.2 pounds amount of candy/number of students

7 0

3 years ago