stats final

In a batch of 8,000 clock radios 3% are defective. A sample of 8 clock radios is randomly selected with replacement from the 8,000 and tested. The entire batch will be rejected if at least one of those tested is defective. What is the probability that the entire batch will be rejected?

0.216

Responses to a survey question about eye color are coded as 1 (for brown), 2 (for blue), 3 (for green), 4 (for hazel), and 5 (for any other color). Does it make sense to find the mean, median, or mode of the coded eye colors?

Mode

Choose the method to solve the problem below: There are members on a board of directors. If they must form a subcommittee of members, how many different subcommittees are possible?

combination

The height of a randomly selected student is ___________.

continuous

An airline checked 7 of its flights into a regional airport and recorded their arrival times. What kind of graph would you use for this data?

dotplot

For all events A and B, P(A or B) = P(A) + P(B)

false

If A and B are independent events, then P(A or B) = 0.

false

If two events are disjoint, then they are independent.

false

Let A = Making an A on Exam 1. Let B = Student is a Business major. Events A and B are disjoint.

false

You can identify the sample size from a boxplot.

false

I know to apply the conditional probability rule when I see what key word(s)?

given or if

I selections are made with replacement, then events are considered:

independent

Determine the appropriate level of measurement: The subjects in which college students major.

nominal

What is the margin of error for a 95% confidence interval when the sample proportion is 0.52 and the sample size is 50? Round your answer to 3

.138

What is the value of the sample proportion for the confidence interval 0.123 < p < 0.147? Round to 3 decimal places.

0.135

What is the t critical value for a sample size of 39 at the 90% level of confidence? Round to 3 decimal places.

1.686

Two 6-sided dice are rolled. What is the probability that the sum of the two numbers on the dice will be 3?

1/18

In a certain lottery, five different numbers between 1 and 21 inclusive are drawn. These are the winning numbers. To win the lottery, a person must select the correct 5 numbers in the same order in which they were drawn. What is the probability of winning?

1/2,441,880

A 6-sided die is rolled. Find P(3 or 5).

1/3

A card is drawn from a well-shuffled deck of 52 cards. Find P(drawing a face card or a 4). Note: 13 Hearts, 13 Diamonds, 13 Clubs, 13 Spades In each suite: A, 2, 3, 4, 5, 6, 7, 8, 9, 10, J, K, Q Face Cards: J, K, Q

4/13

Which of the following are valid probabilities? You may select more than one.

4/5, 0, 12.5%, 0.987

If you pick a card at random from a well shuffled deck, what is the probability you get a face card or a spade?

5/13

Classify as independent or dependent: A: You cook chicken improperly B: You get salmonella poisoning

Dependent

50 randomly selected students were asked if they actually read their statistics textbook. 35 responded that they do not read the textbook. What is the value for the sample proportion for this sample? Give the answer as a percentage.

70%

The amount of Jen's monthly phone bill is normally distributed with a mean of $59 and a standard deviation of $8. What percentage of her phone bills are between $35 and $83?

99.7%

We want to construct a confidence interval for a population mean. We know the value of the population standard deviation. The population is known to be normally distributed. What distribution should we use?

Binomial Distribution

What do we know if P(B|A) is not the same as P(B)?

Events are dependent.

A combination lock uses three numbers between 1 and 99 with repetition, and they must be selected in the same sequence. The total number of combinations is found using the combination formula.

False

In the confidence interval 12 < mu < 16, the margin of error is E = 4.

False

Which of the following is not a type of picture for organizing categorical data?

Histogram

Classify as independent or dependent: A: A bird lays on your head B: The bird lays an egg

Independent

Write the complement of the event below: Of ten adults, at least one of them has high blood pressure.

None of the adults have high blood pressure.

We want to construct a confidence interval for a population mean. We know the value of the population standard deviation. The population is not normally distributed. Our sample size is 49. What distribution should we use?

Normal Distribution

A college wants to conduct a study on the college experience for students in various age categories. Describe a sampling design that utilizes stratified sampling.

Obtain a list of all students attending the college and divide the students into the age categories: 17-19, 20-22, 23-25. Then within the 3 categories randomly chose a sample of 200 students from each to survey about their college experience.

Determine the appropriate level of measurement: A sample of spheres categorized from softest to hardest.

Ordinal

Choose the method to solve the problem below: How many ways can 6 people be chosen and arranged in a straight line if there are 8 people to choose from?

Permuation

We want to construct a confidence interval for a population mean. We do not know the value of the population standard deviation. Our sample size is 125. The population is not normally distributed. What distribution should we use?

Students t-distribution

The cost of taking your pet aboard the air flight with you in the continental US varies according to the airlines. The five number summary for prices based on a sample of major U.S. airlines was: Min = 60, Q1 = 100, Median = 110, Q3 = 125, Max = 150 Which of the following is true about this data? Correct!

The lowest price is an outlier.

If you take large random samples over and over again from the same population, and make 95% intervals for the population average, about 95% of the intervals should contain the population average.

True

The higher the confidence level is, the wider the interval will be.

True

Determine the appropriate level of measurement: Salaries of college professors.

ratio

Scores on a particularly difficult Biology test would be skewed ____________________.

right

The typical deviation from the mean is the

st dev

Determine if the following is true or false: P(A and B) = P(B and A)

true

If events A and B are disjoint, then P(A and B) = 0.

true

Let A = Making an A on Exam 1. Let B = Student is a Business major. Events A and B are independent.

true

The best point estimate for a population parameter is the corresponding sample statistic.

true

The variance of a set of data can be 0.

true

A school has three tenth grade classes. All three classes took the same physics test. The mean scores for the three classes were 75, 71, and 78. Can the mean score for all tenth grade students be found by taking the mean of 75, 71, and 78?

yes