Question 1

The dotplot below displays the total number of miles that the 28 residents of one street in a certain community traveled to work in one five-day workweek. Which of the following is closest to the percentile rank of a resident from this street who traveled 85 miles to work that week?

Accepted Answer

B- 70

Question 2

A large simple random sample of people aged nineteen to thirty living in the state of Colorado was surveyed to determine which of the two MP3 players just developed by a new company was preferred. To which of the following populations can the results of this survey be safely generalized?

Accepted Answer

B) Only people aged nineteen to thirty living in the state of Colorado.

Question 3

Janelle collected data on the amount of time in minutes each person in a large sample of customers spent in a local store. The data also included recording the gender of each customer. These data were used to generate the box plots shown below. Which of the following statements is true?

Accepted Answer

E) approximately half of the males in the sample of customers spent at least as much time in the store as any female in the sample of customers.

Question 4

The probability of obtaining a head when a certain coin is flipped is about 0.65. Which of the following is closest to the probability that heads would be obtained 15 or fewer times when the coin is flipped 25 times?

Accepted Answer

B) 0.37

Question 5

A study was conducted using data collected on the birth weights of a random sample of 10 pairs of identical

Accepted Answer

C) Ho: uD= 0 and Ha: Uf -Us> UD

Question 6

The buyer for an electronics store wants to estimate the proportion of defective wireless game controllers in a shipment of 5000 controllers

Accepted Answer

E) cluster random sample

Question 7

A distribution of test scores is not symmetric. Which of the following is the best estimate of the z-score of the third quartile?

Accepted Answer

E) this z-score cannot be estimated from the information given

Question 8

Sophomore, juniors, and senior students at a high school will be surveyed

Accepted Answer

C) 4

Question 9

A certain type of remote control car has a fully charged battery at the time of purchase

Accepted Answer

A) the probability that the running time of a randomly selected car of this type, before it requires recharging of the battery for the first time after its period of initial use, is between 75 minutes and 82.5 minutes.

Question 10

Which of the following scatterplots could represent a data set with a correlation coefficient of r= -1?

Accepted Answer

A) linear, negative association

Question 11

Publishers of a magazine wish to determine what proportion of the magazines 50,000 subscribers are pleased with their subscription

Accepted Answer

C) Mail surveys to 1,000 subscribers randomly selected from all subscribers.

Question 12

An environmental scientist wanted to test the null hypothesis that an antipollution device for cars is not effective.

Accepted Answer

A) the scientist concludes that the antipollution device is effective when it actually is not.

Question 13

A data set of test scores is being transformed by applying the following rule to each of the raw scores. Which of the following is not true

Accepted Answer

C) the range of transformed scores equals 3.5 ( the range of the raw scores) + 6.2

Question 14

A random sample of 25 households from the Mountainview School District was surveyed. In this survey, data were collected on the age of the

Accepted Answer

D) 8 years old to less than 10 years old

Question 15

Based on a random sample of 50 students, the 90 percent confidence interval for the mean amount of money students spend on lunch

Accepted Answer

D) 90% of all random samples of 50 students obtained at this high school would result in a 90% confidence interval that contains the true mean amount of money students spend on lunch.

Question 16

Ten percent of all Dynamite mints candies are orange and 45 percent of all holiday mints candies are orange

Accepted Answer

D) 13.75 and 2.905

Question 17

In a random sample of 60 shoppers chosen from the shoppers at a large suburban mall, 36 indicated that they has been to a movie

Accepted Answer

D) Two proportion z-test

Question 18

Which of the following differences in cumulative relative frequencies gives the proportion of trees gives the proportion of trees that are 12 inches to 16 inches, inclusive, in diameter?

Accepted Answer

C) 0.726- 0.325

Question 19

An outlier may be defined as a data point that is more than 1.5 times the IQR range below the lower quartile or is more than 1.5 times

Accepted Answer

D) 34

Question 20

The National Honor Society at Central High School plans to sample a random group of 100 seniors from all high school

Accepted Answer

D) increase the sample size

Question 21

Ninety percent of the people who have a particular disease will have a positive result on a given diagnostic test

Accepted Answer

D) 14%

Question 22

A recent survey concluded that the proportion of American teenagers who have a cell phone is 0.27. The true population

Accepted Answer

D) 0.29, square root of (0.29)(0.71)/1000

Question 23

A marketing company wants to estimate the proportion of consumers in a certain region of the country who would react favorably to a new marketing campaign

Accepted Answer

B) 271

Question 24

Traffic data revealed 35 percent of automobiles traveling along a portion of an interstate highway were exceeding the legal speed limit

Accepted Answer

E) It cannot be determined from the information given

Question 25

In a large school district, 16 of 85 randomly selected high school seniors play a varsity sport. In the same district, 19 of 67

Accepted Answer

B) 0.0695

Question 26

The number of points, X scored in a game has the probability distribution below.

Accepted Answer

C) 2

Question 27

Each person in a random sample of adults indicated his or her favorite color. The results shown in the table below are reported by age group of the respondents

Accepted Answer

A) (99)(108)/314

Question 28

In a recent survey, 60 randomly selected married couples from the same town were asked the overall quality of living in their town on a scale of

Accepted Answer

A) husbands tended to rate the quality of living higher then their wives did.

Question 29

A 90 percent confidence interval is to be created to estimate the proportion of television viewers in a certain area who favor the morning broadcast

Accepted Answer

B) the confidence interval would be 3 times as wide as the original confidence interval

Question 30

A new restaurant is interested in determining the best time-temperature combination for roasting

Accepted Answer

E) the two cuts that are being roasted for each time-temperature combination are an example of replication.

Question 31

A local real estate magazine used the median instead of the mean when it reported the SAT Score of the average student

Accepted Answer

A) the mean is affected by the skewness, whereas the median is not.

Question 32

The director of a fitness center wants to examine the effects of two exercise classes (spinning and aerobics) on body fat percentage

Accepted Answer

C) the participants choice of which class to take

Question 33

Raoul performed an experiment using 16 windup rubber band single-propeller airplanes. He wound up the propeller a different number of times

Accepted Answer

A) 0.0462 + (2.145)(0.01565)

Question 34

A recent study was conducted to investigate the duration of time required to complete a certain manual dexterity task. The reported mean was 10.2 seconds

Accepted Answer

B) 0.2743

Question 35

To determine whether employees at Site X have higher salaries,on average, than employees at Site Y of the same company do

Accepted Answer

C) At the 5% significance level, employees at Site X have a significantly higher mean salary than employees at site Y do.

Question 36

The director of a technical school was curious about whether there is a relationship between students who complete one of the schools most popular

Accepted Answer

D) being a person who did not complete the program but completed more advanced studies are less likely than being a person who completed the program and completed more advanced studies.

Question 37

On their birthdays, employees at a large company are permitted to take 60- minute lunch instead of the usual 30 minutes. Data were obtained from 10 randomly selected

Accepted Answer

E) given that the p-value is greater than 0.05, rejecting the null hypothesis and concluding that the mean time was not greater than 60 minutes.

Question 38

A dog food company wishes to test a new high-protein formula for puppy food to determine whether is promotes faster weight gain than the existing formula

Accepted Answer

A) block on dog breed and randomly assign puppies to existing and new formula groups within each breed

Question 39

A statistics student wants to compare the mean times needed to access flight information

Accepted Answer

D) The p-value is greater than 0.1 p; therefore there is no significant difference in mean search times on the two web sites.

Question 40

The histogram below represents the data obtained

Accepted Answer

A

AP Stats – Flashcard

Unlock all answers in this set

Haven't found what you were looking for?

Search for samples, answers to your questions and flashcards