Q: If two different individuals are selected from the news viewing table, what is the probability that both watch ABC?

$$ \frac{80}{270} \times \frac{79}{269} $$

Q: A lottery offers one $$1000 prize, one 500 $$prize, and five $$100 prizes. One thousand tickets are sold at 3 $$each. What is the expected value for a person who buys one ticket?

$$ \frac{1}{1000} \times 1000 + \frac{1}{1000} \times 500 + \frac{5}{1000} \times 100 - 3 $$

Question 1

A survey of 1301 American households found that 66% of the households own at least two bicycles. In this context, what is the population?

Accepted Answer

All American households

Question 2

In a survey conducted in the town of Atherton, 25% of adult respondents reported that they had been involved in at least one car accident in the past ten years. Is the value 25% a parameter or a statistic?

Accepted Answer

Statistic

Question 3

Which of the following variables is qualitative?

Accepted Answer

Gender

Question 4

The weight of a player on the wrestling team is an example of which type of quantitative variable?

Accepted Answer

Continuous

Question 5

A student's favorite sport is measured at which level of measurement?

Accepted Answer

Nominal

Question 6

A medical researcher randomly assigns 52 people to a treatment group and 52 to a placebo group to test a medication. What type of study is this?

Accepted Answer

Experiment

Question 7

Every 14th customer leaving a movie was surveyed. What type of sampling is this?

Accepted Answer

Systematic sampling

Question 8

Refer to the frequency polygon for U.S. Deaths by Legal Intervention. Which age group had the highest number of deaths?

Accepted Answer

25-34 years

Question 9

In the SAT Mathematics Score ogive, what does the cumulative relative frequency of 0.8 at a score of 700 mean?

Accepted Answer

80% of students scored 700 or less

Question 10

Using the news viewing table, what is the probability that a randomly selected individual watches ABC?

Accepted Answer

$$ \frac{80}{270} $$

Question 11

Given the news viewing table, what is the probability that a randomly selected woman watches NBC?

Accepted Answer

$$ \frac{10}{150} $$

Question 12

If two different individuals are selected from the news viewing table, what is the probability that both watch ABC?

Accepted Answer

$$ \frac{80}{270} 	imes \frac{79}{269} $$

Question 13

A lottery offers one $$1000 prize, one 500 $$prize, and five $$100 prizes. One thousand tickets are sold at 3 $$each. What is the expected value for a person who buys one ticket?

Accepted Answer

$$ \frac{1}{1000} 	imes 1000 + \frac{1}{1000} 	imes 500 + \frac{5}{1000} 	imes 100 - 3 $$

Question 14

Mars, Inc. claims that 10% of its M&M plain candies are blue. In a sample of 100 candies, what is the mean number of blue candies expected?

Accepted Answer

$$ 100 	imes 0.10 = 10 $$

Question 15

A sample of 40 employees from a Honda plant has the following stemplot for months worked: 5|2 2 3 3 4 5 7 8 9 9. How many employees have worked at the plant for 5 years?

Accepted Answer

10

Question 16

If the distribution of sociology book costs is bell-shaped with a mean of $$76.75 and a standard deviation of 10.42$$, what is the range of values in which about 68% of the costs will lie?

Accepted Answer

$$ 76.75 \pm 10.42 $$

Question 17

Let $$P(A) = 0.25$$ and $$P(B) = 0.60. If A $$and B are mutually exclusive, what is $$P(A 	ext{ or } B)$$?

Accepted Answer

$$ 0.25 + 0.60 = 0.85 $$

Question 18

Each individual letter of the word 'TENNESSEE' is placed on a piece of paper, and all 9 pieces are placed in a hat. What is the probability that the letter E is selected?

Accepted Answer

$$ \frac{4}{9} $$

Question 19

A statistics student interviews everyone in his apartment building to determine who owns a cell phone. What type of sampling is this?

Accepted Answer

Convenience sampling

Statistics Exam 1 Review: Step-by-Step Study Guidance

Guida di studio - Domande di pratica

Study guide - Flashcard