For each set of data below, draw a scatterplot and decide whether or not the data exhibits approximately periodic behaviour.

a)

b)

c)

d)

Clifland
2021-01-13
Answered

For each set of data below, draw a scatterplot and decide whether or not the data exhibits approximately periodic behaviour.

a)

b)

c)

d)

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Khribechy

Answered 2021-01-14
Author has **100** answers

a) The graph exhibits approximately periodic behaviour.

b) Given information is not enough to determine whether the bahaviour is periodic.

c) Given information is not enough to determine whether the bahaviour is periodic.

d) Information does not exhibit a periodic behaviour.

asked 2021-07-04

Describe how you can use a two -way table to organize data you collect from a survey.

asked 2022-04-06

The occurrence of false positives [in some experiment] is 40%

What does this mean? Does it mean that 40% of positives are false? Or 40% of all tested patients are specifically both false and positive? Or say 40% of those that are false are positive?

What does this mean? Does it mean that 40% of positives are false? Or 40% of all tested patients are specifically both false and positive? Or say 40% of those that are false are positive?

asked 2022-06-24

What is a 'critical value' in statistics?

The raw material needed for the manufacture of medicine has to be at least $97\mathrm{\%}$ pure. A buyer analyzes the nullhypothesis, that the proportion is ${\mu}_{0}=97\mathrm{\%}$, with the alternative hypothesis that the proportion is higher than $97\mathrm{\%}$. He decides to buy the raw material if the nulhypothesis gets rejected with $\alpha =0.05$. So if the calculated critical value is equal to ${t}_{\alpha}=98\mathrm{\%}$, he'll only buy if he finds a proportion of $98\mathrm{\%}$ or higher with his analysis. The risk that he buys a raw material with a proportion of $97\mathrm{\%}$ (nullhypothesis is true) is $100\times \alpha =5\mathrm{\%}$

The raw material needed for the manufacture of medicine has to be at least $97\mathrm{\%}$ pure. A buyer analyzes the nullhypothesis, that the proportion is ${\mu}_{0}=97\mathrm{\%}$, with the alternative hypothesis that the proportion is higher than $97\mathrm{\%}$. He decides to buy the raw material if the nulhypothesis gets rejected with $\alpha =0.05$. So if the calculated critical value is equal to ${t}_{\alpha}=98\mathrm{\%}$, he'll only buy if he finds a proportion of $98\mathrm{\%}$ or higher with his analysis. The risk that he buys a raw material with a proportion of $97\mathrm{\%}$ (nullhypothesis is true) is $100\times \alpha =5\mathrm{\%}$

asked 2022-01-19

What is an example of a continuous random variable?

asked 2022-04-21

Is age group related to the device people prefer to use to watch television? A research firm sought to answer this question by surveying a random sample of 260 U.S. adults age 18 and over. The results are shown below.

$\begin{array}{|ccccc|}\hline & & \text{Device}& & \\ & & \text{Television}& \text{Computer}& \text{Mobile device}\\ & 18-24& 19& 6& 12\\ \text{Age Group}& 25-34& 23& 7& 39\\ & 35-54& 34& 8& 28\\ & 55+& 33& 8& 13\\ \hline\end{array}$

Which of the following tests should be used?

Either (a) or (c).

A chi-square goodness of fit test.

A z-test for the difference of two proportions.

A chi-square test for homogeneity.

A chi-square test for independence.

Which of the following tests should be used?

Either (a) or (c).

A chi-square goodness of fit test.

A z-test for the difference of two proportions.

A chi-square test for homogeneity.

A chi-square test for independence.

asked 2022-05-23

Consider the following:

1. Test for significance of the coefficient of determination

2. F-test for overall model significance

3. Test for significance of the slope coefficient

4. Test for significance of the correlation coefficient

Assuming you have a 5% level of significance, which of the above give equivalent conclusions a simple linear regression?

Select one:

a. 1, 2 and 3

b. 2 and 3

c. 1, 2, 3, and 4

d. 2, 3, and 4

e. 2 and 4

1. Test for significance of the coefficient of determination

2. F-test for overall model significance

3. Test for significance of the slope coefficient

4. Test for significance of the correlation coefficient

Assuming you have a 5% level of significance, which of the above give equivalent conclusions a simple linear regression?

Select one:

a. 1, 2 and 3

b. 2 and 3

c. 1, 2, 3, and 4

d. 2, 3, and 4

e. 2 and 4

asked 2021-12-17

Determine (without solving the problem) an interval in which the solution of the given initial value problem is certain to exist. $(t-3){y}^{\prime}+\left(\mathrm{ln}t\right)y=2t,\text{}y\left(1\right)=2$