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2 years ago

Neveah weighed her cat every day for a year. She then chose a representative sample

1 answer:

8 0

A representative sample implies a subset of a population that reflects the characteristics of the larger group.

<h3>What is a representative sample?</h3>

Your information is incomplete as the options are not given. Therefore, an overview will be given.

A representative sample is the small number of people who reflect a more extensive group accurately. In this case, since Neveah chose a representative sample of 5 random days of the month, it is important for the sample to depict the entire population.

In such a case, the sample has certain qualities that the population has too.

Learn more about sample on:

brainly.com/question/17831271

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Simplify the expression. 3/a-9b

Serhud [2]

We are given with the expression 3/a - 9b = y and is asked to simplify the given equation. in this case, the first step is to multiply both terms with a. this results to 3 - 9 ab. = ay Since the two terms have different variables, this is the simplified form. the answer is <span>3 - 9 ab = ay </span>

3 0

3 years ago

The table below shows all of the possible outcomes of rolling a six-sided number cube and flipping a coin

Juli2301 [7.4K]

Answer: D

Step-by-step explanation:

3 0

4 years ago

A researcher wants to estimate the percentage of all adults that have used the Internet to seek pre-purchase information in the

lara31 [8.8K]

Answer:

The sample size is 1875.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

Sampling error of 0.03.

This means that $M = 0.03$

99.74% confidence level

So $\alpha = 0.0026$ , z is the value of Z that has a pvalue of $1 - \frac{0.0026}{2} = 0.9987$ , so $Z = 3$ .

25% of all adults had used the Internet for such a purpose

This means that $\pi = 0.25$

What is the sample size

The sample size is n. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 3\sqrt{\frac{0.25*0.75}{n}}$

$0.03\sqrt{n} = 3\sqrt{0.25*0.75}$

Simplifying by 0.03 both sides

$\sqrt{n} = 100\sqrt{0.25*0.75}$

$(\sqrt{n})^2 = (100\sqrt{0.25*0.75})^2$

$n = 1875$

The sample size is 1875.

7 0

3 years ago

Multicollinearity may cause problems if the absolute value of the sample correlation coefficient for two of the independent vari

Sladkaya [172]

Answer: a. .7

Step-by-step explanation:

Multicollinearity means the two or more explanatory variables in a multiple regression model are highly linearly related to each other.

Multicollinearity is a problem because

it weaken the statistical significance of an independent variable.
Larger the standard error of a regression coefficient, the less likely it is that this coefficient will be statistically significant.

Multicollinearity may cause problems if the absolute value of the sample correlation coefficient for two of the independent variables exceeds 0.7.

So, the correct option is a. .7 .

6 0

3 years ago

I GIVVVEE BRAINLISTE\

vekshin1

Answer:

3 on the edge

Step-by-step explanation:

7 0

3 years ago