Determine whether the results below appear to have statistical significance, and also determine whether the results have practical significance. In a study of a weight loss program, 7 subjects lost an average of 42 lbs. It is found that there is about a 30% chance of getting such results with a diet that has no effect.

Does the weight loss program have statistical significance?

A.

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

B.

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

C.

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

D.

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

Does the weight loss program have practical significance?

A.

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

B.

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

C.

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

D.

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

Determine whether the given value is a statistic or a parameter. A homeowner measured the voltage supplied to his home

onall30daysofagivenmonth, and the average (mean) value is 144.1 volts.

Choose the correct answer below.

A.

The given value is a

parameter

for the

month

because the data collected represent a

population.

B.

The given value is a

statistic

for the

month

because the data collected represent a

population.

C.

The given value is a

statistic

for the

month

because the data collected represent a

sample.

D.

The given value is a

parameter

for the

month

because the data collected represent a

sample.

Determine whether the underlined number is a statistic or a parameter.

Asampleofprofessorsisselectedanditisfoundthat35%ownacomputer.

Choose the correct statement below.

A. Statistic

because the value is a numerical measurement describing a characteristic of a

sample.

B. Parameter

because the value is a numerical measurement describing a characteristic of a

population.

C. Statistic

because the value is a numerical measurement describing a characteristic of a

population.

D. Parameter

because the value is a numerical measurement describing a characteristic of a

sample.

State whether the data described below are discrete or continuous, and explain why.

The exact heights of different elephants

Choose the correct answer below.

A.

The data are

continuous

because

thedatacantakeonany

valueinaninterval.

B.

The data are

discrete

because

thedatacantakeonany

valueinaninterval.

C.

The data are

discrete

because

thedatacanonlytakeon

specificvalues.

D.

The data are

continuous

because

thedatacanonlytakeon

specificvalues.

Determine whether the value given below is from a discrete or continuous data set.

Thevolumeofcolainacanis12.2oz.

Choose the correct answer below.

A.

The data set is neither continuous nor discrete.

B.

A

discrete

data set because

thereareafinitenumberofpossiblevalues

C.

A

discrete

data set because there are infinitely many possible values and thosevaluescanbecounted

D.

A

continuous

data set because

thereareinfinitelymanypossiblevaluesandthose values cannot be counted

Identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.

To determine her

heartrate,

Keri

divides up her day into three parts: morning, afternoon, and evening. She then measures her

heartrate

at

4

randomly selected times during each part of the day.

What type of sampling is used?

Random

Convenience

Systematic

Stratified

Cluster

Identify which type of sampling is used: random, systematic, convenience, stratified, or cluster.

Aradiostation

asks its

listeners

to call in their opinion regarding

theuseof

pesticidesinresidentialareas.

Which type of sampling is used?

A.

Systematic

B.

Cluster

C.

Random

D.

Stratified

E.

Convenience