Q: Among 1543 women surveyed, 19% responded with 'rarely, if ever' to a question about relaxation. What is the actual number of women who responded this way?

$$1543 \times 0.19 = 293.17$$, so 293 women

Question 1

Which of the following best describes a parameter in statistics?

Accepted Answer

A measurement based on a population.

Question 2

A survey found that 70% of all senior undergraduate students are emotionally ready to graduate. What is the population in this context?

Accepted Answer

All senior undergraduate students.

Question 3

A researcher collects the weights of newborn babies in a hospital. Which type of data is this, and is it discrete or continuous?

Accepted Answer

Quantitative, continuous

Question 4

A study finds that 99% of customers in a weight loss program lost weight over a year, but the average weight loss was only 2 pounds. Which of the following is true?

Accepted Answer

The result is statistically significant but not practically significant.

Question 5

In a survey, 563 subjects were asked how often they drank milk. The survey was posted on a news website and respondents chose to participate. What is the main issue with this sampling method?

Accepted Answer

It is a voluntary response sample, which can introduce bias.

Question 6

A medical organization that opposes meat and dairy receives funding from an animal rights foundation. What potential issue does this introduce in their research?

Accepted Answer

Bias

Question 7

Which of the following best illustrates the concept that 'correlation does not imply causation'?

Accepted Answer

A study finds a strong correlation between ice cream sales and drowning incidents, but eating ice cream does not cause drowning.

Question 8

In a study of 48 randomly selected American Airlines flights from JFK to LAX, the average arrival time is 8.9 minutes late. Is this value a statistic or a parameter?

Accepted Answer

Statistic

Question 9

Which of the following is an example of a continuous variable?

Accepted Answer

Temperature in a building

Question 10

A poll sponsored by the Idaho Potato Commission finds that 26% of 1000 adults selected potatoes as their favorite vegetable. What is a potential issue with this poll?

Accepted Answer

The poll is likely biased due to the sponsor's interest.

Question 11

In a study, 40 subjects lost an average of 22 pounds on a new diet program. There is about a 1% chance of getting such results with a program that has no effect. What can you conclude?

Accepted Answer

The result is statistically significant.

Question 12

Which of the following best describes a simple random sample?

Accepted Answer

A sample where every possible subset of size $$n$$ has an equal chance of being chosen.

Question 13

A student records the years in which the LSU football team has won a national championship. What type of data is this?

Accepted Answer

Qualitative

Question 14

In a survey of 1165 women, 48% said a bended knee was essential for a marriage proposal. What is the exact value of 48% of 1165?

Accepted Answer

$$1165 	imes 0.48 = 559.2$$

Question 15

Among 1543 women surveyed, 19% responded with 'rarely, if ever' to a question about relaxation. What is the actual number of women who responded this way?

Accepted Answer

$$1543 	imes 0.19 = 293.17$$, so 293 women

Question 16

A student records the number of days of rainfall in a year. What type of data is this?

Accepted Answer

Quantitative, discrete

Question 17

Twenty patients with dementia are divided into two groups. One group is given a new drug, the other a placebo. What type of study is this?

Accepted Answer

Experiment

Question 18

Which of the following is an example of a voluntary response sample?

Accepted Answer

A survey posted online where anyone can choose to participate.

Question 19

A data set includes brain volumes from 10 pairs of identical twins, collected by researchers at several universities. Does the source have potential for bias?

Accepted Answer

No, because the data was collected by reputable institutions.

Question 20

In a study, there is a strong correlation between per capita consumption of sour cream and motorcycle fatalities. What is wrong with concluding that sour cream consumption causes motorcycle fatalities?

Accepted Answer

Correlation does not imply causation.

Step-by-Step Guidance for Introduction to Statistics Worksheet

Guida di studio - Domande di pratica

Study guide - Flashcard