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4 years ago

13

A local hardware business wishes to find out how many of the local residents would use a delivery service. They call every tenth

person in the local listings of the phone book.
Which type of sampling is used?

A. convenience

B. stratified

C. cluster

D. systematic

2 answers:

White raven [17]4 years ago

7 0

It is systematic because they are going every tenth person

vova2212 [387]4 years ago

4 0

The answer is systematic

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Dmitry_Shevchenko [17]

Answer:

42.9%

Step-by-step explanation:

So you would use [ ((V2 - V1) / |V1|) * 100 ]

V1 = 87.5 to V2 = 125

= ((125 - 87.5) / |87.5|) * 100

= (37.5 / 87.5) * 100

= 0.428571 * 100

= 42.8571% change

= 42.8571% increase

Then you round to 42.9!

Hope it helps! :)

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3 years ago

Read 2 more answers

The US Census reported that it takes workers an average of 28 minutes to get home from work with standard deviation 5 minutes. A

xz_007 [3.2K]

Using the z-distribution, as we have the standard deviation for the population, to test the hypothesis, it is found that this is evidence that workers in the large city take longer than 28 minutes to get home from work.

<h3>What are the hypothesis tested?</h3>

At the null hypothesis, it is tested if the mean time is of 28 minutes, that is:

$H_0: \mu = 28$

At the alternative hypothesis, it is tested if the mean time is greater than 28 minutes, that is:

$H_1: \mu > 28$ .

<h3>What is the test statistic?</h3>

The test statistic is given by:

$z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}$

The parameters are:

$\overline{x}$ is the sample mean.

$\mu$ is the value tested at the null hypothesis.

$\sigma$ is the standard deviation of the sample.

n is the sample size.

In this problem, the values of the parameters are given by:

$\overline{x} = 32, \mu = 28, \sigma = 5, n = 10$

Hence:

$z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{32 - 28}{\frac{5}{\sqrt{10}}}$

$z = 2.53$

<h3>What is the decision?</h3>

Considering that we have a <em>right-tailed test</em>, as we are testing if the mean is greater than a value, with a standard <em>significance level of 0.05</em>, the critical value is of $z^\ast = 1.645$ .

Since the test statistic is greater than the critical value, it is found that this is evidence that workers in the large city take longer than 28 minutes to get home from work.

To learn more about the z-distribution, you can check brainly.com/question/26454209

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2 years ago

What is greater 3 or -2.5

Tamiku [17]

Answer:

3

Step-by-step explanation:

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3 years ago

Read 2 more answers

Find the volume......

yan [13]

648 cm

To find the volume of a rectangular prism (such as the one in the picture) you would do:

V=L*W*H

So plugging the numbers in:

V=18*12*3

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4 years ago

A marketing manager for a makeup company randomly selected 60 rewards members and splits them into two groups. One group receive

antoniya [11.8K]

Answer:

a)

The sample is 60 rewards members for the makeup company

b)

Appropriate population is the entire members of the makeup company

c)

(Email showing new products or emails showing products that were on sale) are the predictor variables and its categorical

d)

the recipient clicked through to the website or not; is the response variable and its also categorical

Step-by-step explanation:

Given the data in the question;

a) What is the sample?

The sample is 60 rewards members for the makeup company

b) What would be an appropriate population to draw inference to based on this sample?

Appropriate population is the entire members of the makeup company.

c) What is the predictor variable? Is it quantitative or categorical?

The predictor variable is type of emails i.e (email showing new products or emails showing products that were on sale).

This categorical.

d) What is the response variable? Is it quantitative or categorical?

The response variable is; the recipient clicked through to the website or not.

This is also categorical.

6 0

3 years ago