Which of the following questions is unbiased ?

What was the score of the football game last Friday?

Have you tried those nasty new flavors of Lays potato chips?

Do you think the government should be able to spy on all of your private text messages?

Do you think our awesome principal is a great leader for our school?

Which question is biased ?

Do you prefer Taylor Swift or the scandalous Miley Cyrus?

Do you prefer flip flops or sandals?

Should we be required to wear school uniforms?

Do you think a Wal-Mart should be built in town?

Sage wants to know which recreational activity is most popular in Heard County. Which survey question is the least biased prompt for collecting this data?

How do you like to spend your free time?

Are you one of those country boys who hunts all the time?

Do you play those violent video games?

Do you sit at home and read books all the time?

Can pleasant aromas help a student learn better? Two researchers believed that the presence of a floral scent could improve a person's learning ability in certain situations. They had 22 people work through a pencil-and-paper maze 6 times. Three of the times they wore a floral-scented mask and three times they wore an unscented mask. The three trials for each mask followed one another. Testers measures the length of time it took subjects to complete each of the six trials. They reported that, on average, subjects wearing the floral-scented mask completed the maze more quickly that those wearing the unscented mask, although, the difference was not statistically significant. This study is:

an experiment, but not double-blind

A nutritionist wants to study the effect of storage time (6, 12, and 18 months) on the amount of vitamin C present in freeze dried fruit when stored for these lengths of time. Vitamin C is measured in milligrams per 100 milligrams of fruit. Six fruit packs were randomly assigned to each of the three storage times. The treatment, experimental unit, and response are respectively:

A specific storage time, a fruit pack, amount of vitamin C

A specific storage time, amount of vitamin C, a fruit pack

A fruit pack, amount of vitamin C, a specific storage time

Random assignment, a fruit pack, amount of vitamin C

The most important advantage of experiments over observational studies is that

B)Experiments can usually give better evidence of causation

A) experiments are usually easier to carry out

C) Confounding cannot happen in experiments

D) Observational studies cannot use random samples

In order to perform an experiment using 60 members of a gym, I first divide the list of members into men and women because I feel that the results will be different based on gender. I then randomly choose 30 men and 30 women. I assign half of the men to the treatment group and half to the control group. I repeat this procedure with the women. This is an example of a:

double blind simple random sample

An experiment compares the taste of a new spaghetti sauce with the taste of a successful spaghetti sauce. Each of a number of tasters tastes both sauces (in random order) an says which is better. This is called a(n)...

matched pairs design experiment.

randomized comparative experiment.

Medical experiments, such as one to compare aspirin with a placebo for preventing heart attacks, are often double blind. This means that...

neither the subject nor the doctors know which treatment the patient received.

subjects choose which treatment they get, but do not tell the doctors.

all individual data are kept confidential.

subjects are told either their treatment or their medical condition.

In the previous problem, supposed that the researchers suspected that women over the age of 55 may respond differently to the treatment. Given that a random sample of 40,000 women over the age of 45 has already been chosen, the study would have been improved by:

a block design, with blocks determined by age.

a stratified sample, with strata determined by age.

a stratified sample, with strata determined by gender.

a block design, with blocks determined by gender.

a double-blind completely randomized design.

Researchers were interested to know whether internal vehicle temperatures vary by outside temperatures. To evaluate this, temperature rise was measured continuously over a 60-minute period in a dark SUV on 16 different clear, sunny days with outside temperatures ranging from 72 o F to 96 o F. The researchers' method of analysis is best described as:

a randomized comparative experiment.

a single-blind randomized comparative experiment.

Which of the following distinguishes an observational study from a randomized experiment?

In an observational study treatments are not randomly assigned, whereas in a randomized experiment treatments are always randomly assigned.

In an observational study volunteers are always used, whereas in a randomized experiment a random sample is always taken from the population.

In an observational study a random sample is always taken from the population, whereas in a randomized experiment volunteers are always used.

In an observational study a control group is never used, whereas in a randomized experiment a control group is always used.

Total & divided by number of scores

Scores added & divided by the number of scores

the most frequently occurring number

the difference between the biggest and smallest value

Mid Term Review

Authored by Tricia Bourgeault

Mathematics

9th - 12th Grade

CCSS covered

Used 5+ times

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52 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Ms. Nichol samples her class by selecting all students sitting at group 1 and group 5 in her classroom. This sampling technique is called?

Simple

Stratified

Systematic

Cluster

Tags

CCSS.HSS.IC.B.3

MULTIPLE CHOICE QUESTION

2 mins • 12 pts

Farmer Joe separates his apple tree farm into 10 regions. He counts the number of apples produced in just one of the regions and uses that estimate to predict the number of apples produced on the whole farm. This is _______ sampling.

Simple

Cluster

Stratified

Systematic

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Farmer Joe separates his farm into 10 regions. He then randomly selected 5 trees from each region to estimate the number of apples produced on his apple tree farm. This is _____________ sampling.

Cluster

Systematic

Stratified

Simple

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.A.1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

When one examines the entire population instead of a subgroup of the population, this is called a ____________.

Sampling

Census

Bias

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

To study the amount of time students spend doing homework each day, use a random number generator to select 25 students from the student enrollment database to survey.

Convenience Sample

Simple Random Sample

Stratified Random Sample

Interval Sample

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.A.1

CCSS.HSS.MD.B.6

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

True or False: all samples lead to a good prediction about an entire population.

True

False

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Sra. Garces wants to find the average height of all her students in her classes. She decides to use the first 5 people who walk in the door. Is this a good representative sample?

Yes

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

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Mid Term Review

Ms. Nichol samples her class by selecting all students sitting at group 1 and group 5 in her classroom. This sampling technique is called?

Farmer Joe separates his apple tree farm into 10 regions. He counts the number of apples produced in just one of the regions and uses that estimate to predict the number of apples produced on the whole farm. This is _______ sampling.

Farmer Joe separates his farm into 10 regions. He then randomly selected 5 trees from each region to estimate the number of apples produced on his apple tree farm. This is _____________ sampling.

When one examines the entire population instead of a subgroup of the population, this is called a ____________.

To study the amount of time students spend doing homework each day, use a random number generator to select 25 students from the student enrollment database to survey.

True or False: all samples lead to a good prediction about an entire population.

Sra. Garces wants to find the average height of all her students in her classes. She decides to use the first 5 people who walk in the door. Is this a good representative sample?

What type of sampling is this? A journalist asks his family how they feel about water pollution.

What type of sampling is this? Soybeans are planted on a 48-acre field. The field is divided into one acre subplots. A sample of plants is taken from each subplot to estimate the harvest.

What type of sampling? A student asks 12 friends to participate in a psychology experiment.

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