1) Which of the following measures of central location is affected most by extreme values?
A. Median
B. Geometric mean
C. Mean
D. Mode
Ans : C
2) A difference between calculating the sample mean and the population mean is:
A. Only in the symbols, we use 𝑥̅ instead of µ and n instead of N.
B. There are no differences.
C. We divide the sum of the observations by n - 1 instead of n
D. The observations are ranked and select the middle value for the population mean.
Ans: A
3) In a set of observations, which measure of central tendency reports the value that occurs
most often?
A. Mean
B. Geometric mean
C. Median
D. Mode
Ans: D
4) Which of the following is not a requirement of a binomial distribution?
A. A constant probability of success.
B. Equally likely outcomes.
C. Only two possible outcomes.
D. A fixed number of trails.
Ans: B
5) Which of the following is not a requirement of a probability distribution?
A. Equally likely probability of a success.
B. The probability of each outcome is between 0 and 1.
C. Sum of the possible outcomes is 1.00.
D. The outcomes are mutually exclusive.
Ans: A
6) In which of the following distributions is the probability of a success usually small?
A. Binomial
B. Hypergeometric
C. Poisson
D. All distribution
Ans: C
7) The difference between the sample mean and the population mean is called the
A. Population mean.
B. Standard error of the mean.
C. Population standard deviation.
D. Sampling error.
Ans: D
8) Suppose a population consisted of 20 items. How many different samples of n = 3 are
possible?
A. 6840
B. 20
C. 1140
D. 120
Ans: C
9) In a simple random sample
A. Every Kth item is selected to be in the sample.
B. Every item has a chance to be in the sample.
C. Every item has the same chance to be in the sample.
D. All of these
Ans: C
10) A confidence interval
A. Always includes the population parameter.
B. Decreases in width as the sample size is increased.
C. Cannot include a value of 0
D. None of these
Ans: B
11) A point estimate is
A. Always an estimate of the population mean.
B. Always equal to the population value.
C. An estimate of the population parameter.
D. None of these
Ans : C
12) We wish to develop a confidence interval for the population mean. The shape of the
population is not known, but we have a sample of 40 observations. We decide to use the 92%
level of confidence. The appropriate value of z is:
A. 1.96
B. 2.58
C. 1.65
D. 1.75
Ans: D
13) We use the General Rule of Multiplication to combine
A. Events that are not independent.
B. Events that total more than 1.00.
C. Mutually exclusive events.
D. Events based on subjective probabilities
Ans: A
14) Which of the following is not a type of probability?
A. Subjective
B. Relative frequency
C. Independent
D. Classical
Ans : C
15) Events are independent if
A. By virtue of one event happening another cannot.
B. We can count the possible outcomes.
C. The probability of their occurrence is greater than 1.
D. The probability of one event happening does not affect the probability of another
event happening.
Ans D
16) A nominal scale variable is
A. Usually the result of counting something.
B. May assume negative values.
C. Has a meaningful zero point.
D. Cannot have more than two categories.
Ans: A
17) Which of the following statements is true regarding a population?
A. It must be a large number of values.
B. It must refer to people.
C. It is a collection of individuals, objects, or measurements.
D. None of these
Ans: C
18) A discrete variable is
A. An example of a qualitative variable.
B. Can assume only certain clearly separated values
C. Can assume only whole number values.
D. Cannot be negative.
Ans: B
19) The alternate hypothesis
A. Is accepted if the null hypothesis is rejected.
B. Will always contain the equal sign.
C. None of these
D. Tells the value of the sample mean.
Ans : A
20) In a two-sample test of means for independent samples, we use the z distribution when
A. The population standard deviations are equal.
B. Both populations have at least 4,000 observations.
C. nB and n(1-B) are both greater than 5.
D. Both population standard deviations are known.
Ans: D
21) Which of the following is a requirement for a two-sample test of proportions.
A. The population standard deviations are equal.
B. Both populations are positively skewed.
C. nB and n(1-B) are both greater than 5.
D. Both samples are at least 30.
Ans D
22) Which of the following is not a characteristic of the X2
A. Its shape is based on the sample size.
B. It is not negative.
C. It approaches a normal distribution as the degrees of freedom increase.
D. It is positively skewed.
Ans: A
23) In a contingency table
A. The number of rows must be the same as the number of columns.
B. A variable is classified according to two criteria.
C. There must be at least 10 observations in each cell.
D. All of these
Ans : B
24) To conduct a nonparametric test the.
A. Population must follow the normal distribution.
B. The standard deviation must be known.
C. The data must be at least interval scale.
D. It is not necessary to make any assumption about the shape of the population.
Ans: D
25) A correlation matrix
A. Shows all simple coefficients of correlation.
B. Shows all possible net regression coefficients.
C. Reports the multiple regression equation.
D. Shows the correlations that are positive.
Ans A
26) In a multiple regression equation
A. There is only one dependent variable.
B. The R2 term must be at least .50.
C. All the regression coefficient must be between -1.00 and 1.00.
D. None of these
Ans: A
27) A dummy variable or indicator variable
A. May assume only a value of 0 or 1.
B. Is another term for the dependent variable.
C. Is equal to Y
D. Is found by (Y - Y).
Answer: A
Answers
Q1
C
Q2
A
Q3
D
Q4
B
Q5
A
Q6
C
Q7
D
Q8
C
Q9
C
Q10
B
Q11
C
Q12
D
Q13
A
Q14
C
Q15
D
Q16
A
Q17
C
Q18
B
Q19
A
Q20
D
Q21
D
Q22
A
Q23
B
Q24
D
Q25
A
Q26
A
Q27
A