Question

**Question:**A taxi agency collected data from a random sample of 600

people in their city

asking whether or not they own a car. Based on the results, they report that 44%

of the people in the state own a car. Why is this statistic misleading?

Select the correct answer below:

A)The statistic contains a calculation error.

B)The sample size is insufficient.

C)The data contains an outlier.

D)The sample is biased.

Question 2

In order to study the shoe sales of people in his store, Billy samples the population by dividing the customers by age and randomly selecting a proportionate number of customers from each age group. Which type of sampling is used?

Select the correct answer below:

A)systematic sampling

B)stratified sampling

C)convenience sampling

D)cluster sampling

Question 3

Is a survey that asks the opinions of students about a proposed tour program to a hill station an observational study or experimental study? If it is an experimental study, what is the controlled factor?

Select the correct answer below:

A)The study is an experiment. The controlled factor is the students.

B)The study is an observational study.

C)The study is an experiment. The controlled factor is the hill station.

D)The study is an experiment. The controlled factor is the survey.

Question 4

To determine whether or not number of complaints influences accidents occurring in an area, Charles has designed a survey. What is the explanatory variable?

Select the correct answer below:

A)number of complaints

B)accidents occurring in an area

C)the number of people surveyed

D)none of the above

Question 5

A farmer divided his piece of land into 2

equivalent groups and the quality of the soil is the same in both of these groups. He used fertilizers for the first group of land. He did not use fertilizers for the second group of land. At the end of the season, he measured the yield of the crops in these 2

groups. Is the study observational or experimental? If it is an experiment, what is the controlled factor?

Select the correct answer below:

A)The study is an experiment. The controlled factor is the fertilizer.

B)The study is an observational study.

C)The study is an experiment. The controlled factor is the land.

D)The study is an experiment. The controlled factor is the growth of the crops.

Question 6

Which of the following scenarios contain biased samples? Select all that apply.

Select all that apply:

- A)To estimate the mean number of sales that coworkers take at his company, Benjamin collects data from a randomly selected proportionate number of coworkers from each company site.

- B)Howard wants to estimate the mean cost of waste in his company. He collects data by recording waste from the first process step.

- C)To estimate the political party distribution of residents in his state, Sean collects data from a large group of randomly selected residents of his city.

- D)Teresa wants to estimate the mean amount of money spent on clothes per week by mall shoppers. She collects data from every 10th person entering a clothing store at the mall.

Question 10

Given that Cheryl is collecting data on car color, what type of data is she working with?

Select the correct answer below:

A)qualitative

B)discrete quantitative

C)continuous quantitative

D)none of the above

Question 11

A company has developed a wristband for monitoring blood sugar levels without requiring direct blood samples. It is interested in demonstrating the accuracy of the device for governmental approval and has decided to test the claim "The glucose level reported by the wristband is within 10%

of a standard blood test result." Which of the following data collection processes would be appropriate? Select only one answer choice.

Select the correct answer below:

A)Choose a random sample of employees at lunchtime and measure their blood sugar using both the wristband and a standard blood test.

B)Choose a random sample of people from the local area and random times throughout the day and measure their blood sugar using both the wristband and a standard blood test.

C)Choose a random sample of people from the local area and random times and measure their blood sugar using the wristband. Choose another random sample of people and random times and measure their blood sugar using the standard blood test.

D)Go to a hospital and have the doctors choose a random sample of patients to be tested at random times using both the wristband and the standard blood test.

Question 12

When considering different sampling methods, cluster sampling includes the steps: _______.

Select the correct answer below:

A)identify individuals of the population that are easily accessible; obtain data from these individuals

B)list the members of the population; use simple random sampling to select a starting point in the population; let k = (number of individuals in the population)/(number of individuals needed in the sample); choose every kth individual in the list starting with the one that was randomly selected

C)divide the population into groups; use simple random sampling to identify a proportionate number of individuals from each group

D)use simple random sampling to select a set of groups; every individual in the chosen groups is included in the sample

Question 13

Is the statement below true or false?

Continuous is the type of quantitative data that is the result of measuring.

Select the correct answer below:

True

False

Question 14

A regional airline service advertises that their average ticket price is $60

. Given that their ticket prices are $14

, $85

, $94

, and $107

, why is this statistic misleading?

Select the correct answer below:

A)The statistic contains a calculation error.

B)The sample is biased.

C)The sample size is insufficient.

D)The data contains an outlier.

Question 15

Gloria collected data from a random sample of 1200

students in her school district asking whether or not they read more than one book per month. Based on the results, she reports that 35%

of the students in all state schools read more than one book per month. Why is this statistic misleading?

Select the correct answer below:

A)The data contains an outlier.

B)The sample size is insufficient.

C)The sample is biased.

D)The statistic contains a calculation error.