Prob + Stat FA

Voluntary response sampling

A TV show host asks his viewers to visit his website and respond to an online poll. What type of sample is this?

yearly salary, age

A company database contains the following information about each employee: age, date hired, sex (male or female), ethnic group (Asian, African-American, Hispanic, Caucasian, etc.), job category (clerical, management, technical, etc.), yearly salary. Which of the following lists of variables are all numerical?

symmetric

A normal distribution is always

cluster sample

A principal orders t-shirts and wants to check some of them to make sure they were printed properly. She randomly selects 2 of the 10 boxes of shirts and checks every shirt in those 2 boxes. What sampling method is being used?

any sample that gives every individual the same chance to be selected

A simple random sample is

nonresponse error

A survey was sent to a simple random sample of college undergraduates. The sample size was 500. When asked whether or not they liked country music, 150 of these students did not give any answer. This is an example of

observational study

An educational research company asked 500 high school males and 500 high school females across the U.S. about their cell phone use. In addition to their gender, students were asked, "How many text messages have you sent in the last week?" The company plans to compare the text-messaging habits of males and females. This is an example of:

matched pairs design

An experiment compares the taste of a new spaghetti sauce with the taste of a successful sauce. Each of a number of tasters tastes both sauces (in random order) and says which tastes better. This is called a

.3, .3, .3, .1

An experiment has four possible outcomes: A, B, C, and D. Which of the following is a legitimate assignment of probabilities for these four events?

mean

An outlier will usually have a large effect on the

the median, the quartiles, the minimum and the maximum

The five numbers in the five-number summary are:

1,404,000

Each employee at a large company is to be issued a computer ID code that consists of three letters followed by two digits. How many ID codes are possible if neither letters nor digits may repeat?

SRS

Farmer Joe randomly picks 100 trees using a random number generator to estimate the number of apples produced by his apple trees. This is:

clearly skewed to the right

Here is a stem plot of the percent of adult males who are illiterate in 142 countries, according to the United Nations. The over all shape of this stem plot is?

720

How many different arrangements can you make with the word "SENIOR"?

15,504

How many different versions of a test can be made from a test bank of 20 questions if the test consists of 5 questions?

60

How many different ways can a president, vice-president, and treasurer be chosen from the five people who are willing to be nominated for the positions? (order matters)

.5

If I toss a fair coin five times and the outcomes are TTTTT, then the probability that tails appears on the next toss is

.4

If a coin has 0.6 probability coming up tails, the probability that it comes up heads is

Day: 150, 19, 11, 144

Mrs. Brumfield has decided to grant four special "sleep-in" days during the upcoming 180-day school year. She decides to use a random digits table to select the four days, using the following line from a random digits table select the 4 days that students would get to sleep in. Use the following line. 15099 40192 77011 14459 31901 21491 14873 04197

-1.0

The mean is 80 and the standard deviation is 10. What is the standard score (z-score) of an observation of 70?

22.2

Scores on the American College Testing (ACT) college entrance exam follow the normal distribution with mean 18 and standard deviation 6. Wayne's standard score on the ACT was 0.7. What was Wayne's actual ACT score?

subjects are anonymous, subjects are randomly chosen, subjects cannot be harmed

The basic ethical requirements for any study of human subjects are

8/36

The casino game craps is based on rolling two dice. Here is the assignment of probabilities to the sum of the numbers on the up faces when two dice are rolled: Used the diagram to: The most common be in craps is the "pass line". A pass line bettor wins immediately if either a 7 or an 11 comes up on the first roll. This is called a "natural". What is the probability of rolling a natural?

be reliable but somewhat biased

The diameter of a metal rod was measured 7 times and the results in millimeters were 31.7, 31.

79% ± 11.7%

The student newspaper runs a weekly question that readers can answer online or by campus mail. One question was "Do you think the college is doing enough to provide student parking?" Of the 136 people who responded, 79% said "No." If we applied the quick method (margin of error) to the poll, we would obtain this 95% confidence interval:

48

There are 12 daily flights from San Francisco to Los Angeles and 4 daily flights from Los Angeles to San Diego. How many different ways are there to fly from San Francisco to Los Angeles and then onward to San Diego?

6/35,152

Three cards are chosen at random from a deck without replacement. What is the probability of getting a jack, a ten, and a nine in order? (simplify your answer)

Your score was equal to or higher than approximately 65% of the people who took this exam

You are told that your score on an exam is at the 65th percentile of the distribution of scores. This means that

all the observations have the same value

You calculate that the standard deviation of a set of observations is 0. This tells you that