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3 years ago

Which of the following activities are examples of data gathering?

Mathematics

2 answers:

svet-max [94.6K]3 years ago

5 0

Answer:

C and E are the only correct answers!!

Step-by-step explanation:

denpristay [2]3 years ago

5 0

Answer:

option C and option E

Step-by-step explanation:

IMO, data gathering is the collection of variable of interest in an established systematic fashion that enables one to answer stated research questions, test hypotheses, and evaluate outcomes.

A.Finding the mean weight of cancer patients in a study

Before finding the mean weight, data has already being gathered. In finding the mean weight, the values of the weight of the different cancer patients was already collected.

B.Graphing the heights of trees

Graphing is the process of plotting graphs with variables. These variables were already gathered.

C.Asking voters whom they will vote for

This activity is an example of data gathering. Variables are collected when the voters answers who they would vote for, in this process, data is gathered.

D.Using the results of a mathematical model to predict the next day's weather

These results to be used to predict the next day's weather was already gathered.

E.Weighing wildlife

During this process, fresh variables are collected while weighing the wildlife.

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Solve the following equation: 1/3(y - 2) -5/6 (y + 1) =3/ 4(0 - 3) - 2

Evgesh-ka [11]

Answer:

11/5

Step-by-step explanation:

If you need help with more problems like this you can use m a t h w a y. (remove the spaces) :)

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3 years ago

A study was conducted to determine whether magnets were effective in treating pain. The values represent measurements of pain us

amm1812

Answer:

Given:

Sham: n= 20, x=0.44, s=1.24,

Magnet:n= 20, x =0.49, s= 0.95

For Sham:

Sample size, n = 20

Sample mean = 0.44

Standard deviation = 1.24

For Magnet:

Sample size = 20

Sample mean = 0.49

Standard deviation = 0.95

The null and alternative hypotheses:

H0: s1²=s2²

H1: s1² ≠ s2²

a) To find the test statistics, use the formula:

$\frac{s1^2}{s2^2}$

$\frac{1.24^2}{0.95^2} = \frac{1.5376}{0.9025} = 1.7037$

Test statistics = 1.7037

b) P-value:

Sham: degrees of freedom $= n - 1 = 20 - 1 = 19$

Magnet: degrees of freedom $= n - 1 = 20 - 1 = 19$

The critical values:

[Za/2, df1, df2)], [(1 - Za/2), df1, df2]

$f[0.05/2, 19, 19], f[(1 - 0.05/2), 19, 19]$

$f[0.025, 19, 19], f[0.975, 19, 19]$

$(2.526, 0.3958)$

The rejection region:

Reject H0, if F < 0.3958 or if F > 2.526

c) Conclusion:

Since the critical values of test statistic is between (0.3958 < 1.7037 < 2.526), we fail to reject null hypothesis H0.

There is insufficient evidence to to support the claim that those given a sham treatment have reductions that vary more than those treated with magnets

3 0

2 years ago

An upper triangular matric is square matrix with all zeros below its daignal. A lower triangular matrix is a square matrix with

AleksandrR [38]

Answer:

U₂₁ and U₂₂ fits in the line of upper triangular

Step-by-step explanation:

As explain in the question

An upper triangular matric is square matrix with all zeros below its daignal. A lower triangular matrix is a square matrix with all zeros above its diagonal.

(as shown in the attached image)

(a)for all 3×3 upper triangular matirices U, verify that U2 is also upper triangular

for a matrices U (having a 3*3 matrix), assuming for example, U is given below:

U = $\left[\begin{array}{ccc}1&2&3\\0&5&6\\0&0&9\end{array}\right]$