One-Variable Statistics
Which of the following values can be negative?
A) The IQR
B) The Correlation Coefficient
C) The Sample Vairance
D) The Coefficient of Determination
B) The Correlation Coefficient
If the correlation coefficient between the two components of a bivariate dataset is exactly 0.56, then what is the sum of all possible values of the coefficient of determination calculated from this bivariate dataset?
A) 0
B) 0.3136
C) 0.56
D) 0.7483
E) None of the Above
B) 0.3136
Veronica wants to know about the general public's rating of her new type of gum. So she goes to a local supermarket (where people typically purchase gum) and convinces the first 250 people she sees to try a piece of gum (chosen by her at random): either her new gum or the leading competitor's gum. Once they are given one piece of gum and asked to chew it for one minute, they are asked to spit it out. The subjects are then told to report which piece of gum they prefer. Both pieces of gum look identical both before and after being chewed.
What type of sampling methodology did Veronica use for her study?
A) Convenience Sample
B) Systematic Random Sample
C) Cluster Random Sample
D) Stratified Random Sample
E) None of the Above
A) Convenience Sample
Which theorem below is the supporting theorem for the notion that as the size of a random sample from some population approaches infinity, the mean of the sample will approach the population mean?
A) The Law of Large Numbers
B) The Central Limit Theorem
C) The Empirical Rule
D) Bayes Theorem
A) The Law of Large Numbers
Use the following dataset:
{25, 48, 29, 35 79, 53, 58, 19, 8, 11, 21, 45, 56, 78, 34, 46, 18, 39, 60, 72}
Find the sum of all five numbers in the 5-number summary.
Answer: _________
209
A national consumer magazine reported the following correlations.
Which of the following statements are true?
I. Heavier cars tend to be less reliable.
II. Heavier cars tend to cost more to maintain.
III. Car weight is related more strongly to reliability than to maintenance cost.
(A) I only
(B) II only
(C) III only
(D) I and II
(E) I, II, and III
(E) I, II, and III
Which of the following is the minimum sample size required to estimate an unknown population proportion with 95% confidence and a margin of error of 3.1% when no prior estimate for the proportion is known?
A) 999
B) 1000
C) 1067
D) 1068
B) 1000
Which of the following (are) important aspects (and in some cases, absolute requirements) of a well-designed experiment?
1. Random assignment of subjects or experimental units to at least two treatment groups
2. Using a large number of subjects or experimental units to help reduce sampling variability
3. Using a placebo and double-blinding technique if an when they are possible and called for.
4. Controlling as many confounding variables as possible that can influence a response variable as much as possible.
A) 1, 2, and 4
B) 1, 2, and 3
C) 2, 3, and 4
D) 1, 3, and 4
E) None of the Above
E) None of the above
Home>AP statistics>Lesson
AP Statistics Practice Test
This is a practice test for the multiple-choice section of the Advanced Placement Statistics Exam. The test consists of 40 questions, each followed by five possible answers. Choose the response that best answers the question.
Problem 4
Which of the following statements is true?
I. The center of a confidence interval is a population parameter.
II. The bigger the margin of error, the smaller the confidence interval.
III. The confidence interval is a type of point estimate.
IV. A population mean is an example of a point estimate.
(A) I only
(B) II only
(C) III only
(D) IV only
(E) None of the above.
E) None of the above
Sam is taking his AP Statistics test and gets confused between the characteristics of a geometric distribution versus a binomial distribution. Each statement below is assigned a value in the parentheses next to the statement. Find the sum of the statement values that correspond to the statements that describe features of a geometric distribution.
- There are one or more Bernoulli trials with all failures and a trial usually ending in a success (-10)
- Each trial is independent (2)
- There are two possible outcomes on each trial (3)
- There is a fixed number of trials (-6)
- The distribution is skewed to the right (-1)
- The probability of success and failure does not change from one Bernoulli trial to the next (0)
A) -3
B) -11
C) -1
D) 1
E) None of the Above
E) None of the Above
The correct answer is -6
-10 + 2 + 3 + (-1) + 0 = -6
Suppose Mr. Rooze gave an Algebra 2 test to all of his Algebra 2 honors students, but he is dissatisfied with the distribution of the scores. So he decides to "curve" them via a linear transformation in the form of multiplying each student's original score by 0.8 and then adding 20 points to that result. Then for fun, Mr. Rooze decides to randomly select one of his ALgebra 2 students and determines the z-score of the student's score after the linear transformation is applied to the student's original score. Suppose we let Z0 represent the original z-score of the student's score and Z1 represent the z-score of the student's score after the linear transformation is applied to the student's original score. Which of the following describes the correct relationship between Z0 and Z1?
A: Z1 = 0.8(Z0) + 20
B: Z1 = Z0 + 20
C: Z1 = Z0
D: Z1 = 0.8(Z0)
C: Z1 = Z0