Crowdly

Add to Chrome

Universities
aula.esci.upf.edu

Looking for test answers and solutions? Browse our comprehensive collection of verified answers for at aula.esci.upf.edu.

Get instant access to accurate answers and detailed explanations for your course questions. Our community-driven platform helps students succeed!

The hypothesis stating that the population mean years of age of students in a school is equal to 15 will necessarily be the Alternative hypothesis of the test (the null hypothesis will be that the average is different from 15).

True

False

View this question

Non-parametric tests rely on assumptions about the shape of the underlying population distribution and the parameters of the assumed distribution.

The alternative hypothesis (the opposite of the null hypothesis) can be thought of as meaning no change or no different from the assertion we want to test.

When we are dealing with samples (not census)

We can make useful statements about the population to inform business decision-making.

We can be 100% sure of our results

Results will not vary depending on the particular sample

None of the answers is true

View this question

Efficiency is:

A desirable property of point estimators according to which the expected value of the statistic equals the parameter.

A desirable property of point estimators according to which the bias decreases when the sample size increases.

None of the answers is correct.

A desirable property of point estimators according to which the estimator has the smallest variance possible.

View this question

How does simple random sampling ensure fairness?

It guarantees that all subgroups in the population are included

Every individual in the population has an equal chance of being selected

It eliminates all sources of sampling error

It selects individuals based on a fixed pattern

View this question

Statistical inference:

None of the answers is correct.

Is only used for the analysis of population means.

Does not require probability calculations to substantiate conclusions.

Draws conclusions about a sample based on information about the population.

View this question

The Law of the Large Numbers says that...

The sample mean must approach the population mean as the size of the sample grows.

100%

None is true

The population mean must approach the sample mean as the size of the sample grows.

The population mean is the natural estimator of the sample mean.

View this question

A 98% confidence interval for the population mean can be interpreted as follows:

There is 98% probability that the true population mean is within the confidence interval.

All three answers are correct

One can be 98% confident about having selected a sample whose range includes the sample mean.

If all possible samples are taken and confidence intervals are calculated, 98% of those intervals would include the true population mean somewhere in their interval.

100%

View this question

The margin of error in the population mean estimation reflects:

How confident we are that the parameter, population mean, is estimated accurately.

All are true

How accurate we believe our guess for the parameter is, based on the variability of the estimate and how confident we are that the procedure will catch the true population mean.

100%

The variability of the estimate based solely on the characteristics of the parameter.

View this question

Want instant access to all verified answers on aula.esci.upf.edu?

Get Unlimited Answers To Exam Questions - Install Crowdly Extension Now!

Add to Chrome

Telegram Instagram TikTok Question Bank

Add to Chrome