#1

Determine whether the results below appear to have statisticalsignificance, and also determine whether the results have practical significance.

In a study of a weight lossprogram, 4 subjects lost an average of 43 lbs. It is found that there is about a 25% chance of getting such results with a diet that has no effect.

Does the weight loss program have statisticalsignificance?

A.

No, the program is not statistically significant because the results are unlikely to occur by chance.

B.

Yes, the program is statistically significant because the results are likely to occur by chance.

C.

No, the program is not statistically significant because the results are likely to occur by chance.

D.

Yes, the program is statistically significant because the results are unlikely to occur by chance.

Does the weight loss program have practicalsignificance?

A.

Yes, the program is practically significant because the amount of lost weight is large enough to be considered practically significant.

B.

Yes, the program is practically significant because the results are too unlikely to occur by chance.

C.

No, the program is not practically significant because the amount of weight lost is trivial.

D.

No, the program is not practically significant because the results are likely to occur even if the weight loss program has no effect.

#2

A particular country has 40 total states. If the areas ofall 40 states are added and the sum is divided by 40, the result is 190,637 square kilometers. Determine whether this result is a statistic or a parameter.

Choose the correct answer below.

A.

The result is a statistic because it describes some characteristic of a sample.

B.

The result is a parameter because it describes some characteristic of a population.

C.

The result is a statistic because it describes some characteristic of a population.

D.

The result is a parameter because it describes some characteristic of a sample.

#3

Determine whether the given value is a statistic or a parameter.

Asampleof646adultsshowedthat18%votedinthepastelection.

Choose the correct answer below.

A.

The value is a parameter because it is a numerical measurement describing some characteristic of a population.

B.

The value is a statistic because it is a numerical measurement describing some characteristic of a population.

C.

The value is a parameter because it is a numerical measurement describing some characteristic of a sample.

D.

The value is a statistic because it is a numerical measurement describing some characteristic of a

#4

Determine whether the description corresponds to an observational study or an experiment.

Sixtypatientswithhearinglossaredividedintotwogroups.Onegroupreceivesan experimentaltreatment,theotheraplacebo. Afterthreemonths,hearingacuity ismeasured.

Does the description correspond to an observational study or anexperiment?

A. Experiment

B. Observational study

#5

Determine whether the study is an experiment or an observationalstudy, and then identify a major problem with the study.

In asurvey, 1465 Internet users chose to respond to this question posted on anewspaper's electronicedition: "Is news online as satisfying as print and TVnews?" 52% of the respondents said"yes."

This is an __________( A. experiment, B. Observational Study) because the researchers _____________( A. do not attempt to modify, B. apply a treatment to) the individuals.

What is a major problem with thestudy?

A.

This is a convenience sample with voluntaryresponse, which has a high chance of leading to bias.

B.

There is no blinding orreplication, which has a high chance of leading to bias.

C.

The sample is not very large.

D.

The results apply only to Internet users.