A taxi agencycollected data from a random sample of600

people intheir city asking whether or not they own a car. Based on the results,they report that44%

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

Select the correct answer below:

The statistic contains a calculation error.

The sample size is insufficient.

The data contains an outlier.

The sample is biased.

Question 2

In order to study the shoe sales of people in his store, Billy samples the population by dividing thecustomers 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:

systematic sampling

stratified sampling

convenience sampling

cluster sampling

Question 3

Is a survey that asksthe opinions of students abouta proposed tour programto 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:

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

The study is an observational study.

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

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

Question 4

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

Select the correct answer below:

number of complaints

accidents occurring in an area

the number of people surveyed

none of the above

Question 5

A farmer divided his piece of land into2

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 usefertilizers for the second group of land. At the end of the season, he measured the yield of the crops in these2

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

Select the correct answer below:

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

The study is an observational study.

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

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:

• To estimate the mean number of sales thatcoworkers take at his company, Benjamin collects data from a randomly selected proportionate number ofcoworkers from each company site.
• Howard wants to estimate the mean cost ofwaste in his company. He collects data by recording waste from the first process step.
• 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.
• Teresa wants to estimate the mean amount of money spent on clothes per week by mall shoppers. She collects data from every10
• th 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:

qualitative

discrete quantitative

continuous quantitative

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 within10%

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:

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

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.

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.

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:

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

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

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

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 regionalairline 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:

The statistic contains a calculation error.

The sample is biased.

The sample size is insufficient.

The data contains an outlier.

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Question 15

Gloria collected data from a random sample of1200

students in her school district asking whether or not they read more than one book per month. Based on the results, she reports that35%

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

Select the correct answer below:

The data contains an outlier.

The sample size is insufficient.

The sample is biased.

The statistic contains a calculation error.