Question 1

A biased sample can never be

Accepted Answer

A)  selected from a single population 
B)  selected when the parameters are known 
C)  selected when the entire population is available 
D)  representative of the population 
A)  selected from a single population 
B)  selected when the parameters are known 
C)  selected when the entire population is available 
D)  representative of the population

Question 2

The standard deviation of the population of men's collar sizes is 1.02 inches. A random sample of 12 men was selected and yielded a mean collar size of 15.50 inches.
a. Calculate the standard error of the mean.
b. Use the z test to establish whether this sample could represent the population of men's collar sizes which is known to have a mean of 15 inches.

Accepted Answer

A,SEm = .2

Question 3

With a known population mean of 1500, and a known standard error of the mean of 42.50, what is the probability of selecting at random a sample whose mean is 1450 or less?

Accepted Answer

The answer of With a known population mean of 1500,...

Question 4

By definition, one can never obtain a statistic unless

Accepted Answer

A)  the entire population has been measured 
B)  a random sample has been measured 
C)  a quota sample has been measured 
D)  none of these, since a statistic refers to a measure of any type of sample 
A)  the entire population has been measured 
B)  a random sample has been measured 
C)  a quota sample has been measured 
D)  none of these, since a statistic refers to a measure of any type of sample

Question 5

A researcher in the area of IQ wishes to measure a sample of children using the WISC III. The standard deviation on the WISC-III is 15. How large a sample should be selected if the researcher wishes to be .99 accurate to within 5 IQ points?

Accepted Answer

59.908 or

Question 6

A researcher in the area of IQ wishes to measure a sample of children using the WISC III. The standard deviation on the WISC-III is 15. How large a sample should be selected if the researcher wishes to be .99 accurate to within 3 IQ points?

Accepted Answer

166.41 or

Question 7

Any value which is based on having measured a sample is called

Accepted Answer

A)  a parameter 
B)  a statistic 
C)  an infinite measure 
D)  biased 
A)  a parameter 
B)  a statistic 
C)  an infinite measure 
D)  biased

Question 8

With a known population mean of 50 and a known standard error of the mean of 4.00, what is the probability of selecting at random a sample whose mean is 52 or greater?

Accepted Answer

The answer of With a known population mean of 50...

Question 9

A population may never share more than one common trait.

Accepted Answer

A) True 
 B)False

Question 10

With a known population mean of 75 and a known standard error of the mean of 5.00, what is the probability of selecting at random a sample whose mean is 70 or less?

Accepted Answer

The answer of With a known population mean of 75...

Question 11

The sample selected by the Literacy Digest in 1936 was

Accepted Answer

A)  far too small to be accurate 
B)  overly represented by affluent voters 
C)  overly represented by Democrats 
D)  truly random 
A)  far too small to be accurate 
B)  overly represented by affluent voters 
C)  overly represented by Democrats 
D)  truly random

Question 12

The range of values for the sampling distribution of means

Accepted Answer

A)  is larger than the range of the underlying individual scores 
B)  is identical to the range of the underlying individual scores 
C)  is smaller than the range of the underlying individual scores 
D)  is always equal to 30 or higher 
A)  is larger than the range of the underlying individual scores 
B)  is identical to the range of the underlying individual scores 
C)  is smaller than the range of the underlying individual scores 
D)  is always equal to 30 or higher

Question 13

When a group is truly selected randomly from a population, the probability of its mean value being higher than the parameter mean is

Accepted Answer

A)  0.00 
B)  .50 
C)  1.00 
D)  .33 
A)  0.00 
B)  .50 
C)  1.00 
D)  .33

Question 14

The fact that the distribution of random sample means is assumed to approximate normality is expressed in

Accepted Answer

A)  the Gaussian Law 
B)  Pascal's triangle 
C)  the Central Limit theorem 
D)  none of these, since the premise is false 
A)  the Gaussian Law 
B)  Pascal's triangle 
C)  the Central Limit theorem 
D)  none of these, since the premise is false

Question 15

It is assumed that random sample

Accepted Answer

A)  must contain bias 
B)  is too much a matter of chance to be dependable 
C)  is only valid when used for description purposes 
D)  will probably be representative of the population 
A)  must contain bias 
B)  is too much a matter of chance to be dependable 
C)  is only valid when used for description purposes 
D)  will probably be representative of the population

Question 16

In order to make accurate population estimates, the sample must be

Accepted Answer

A)  very large 
B)  representative of the population 
C)  manipulated by the experimenter 
D)  free of any possible sampling error 
A)  very large 
B)  representative of the population 
C)  manipulated by the experimenter 
D)  free of any possible sampling error

Question 17

The null hypothesis for the z test, since it is based on chance, must always be accepted.

Accepted Answer

A) True 
 B)False

Question 18

Stratified sampling refers to the actual number of different samples being selected from a single population.

Accepted Answer

A) True 
 B)False

Question 19

The reason the Literary Digest's 1936 election poll was so inaccurate, was that

Accepted Answer

A)  the sample was too small 
B)  it contained sampling error 
C)  the sample was biased 
D)  the wrong statistical tests were employed for extrapolating to the 
A)  the sample was too small 
B)  it contained sampling error 
C)  the sample was biased 
D)  the wrong statistical tests were employed for extrapolating to the

Question 20

When samples are selected randomly, they are assumed to be representative of the population.

Accepted Answer

A) True 
 B)False

A biased sample can never be

With a known population mean of 1500, and a known standard error of the mean of 42.50, what is the probability of selecting at random a sample whose mean is 1450 or less?

By definition, one can never obtain a statistic unless

A researcher in the area of IQ wishes to measure a sample of children using the WISC III. The standard deviation on the WISC-III is 15. How large a sample should be selected if the researcher wishes to be .99 accurate to within 5 IQ points?

A researcher in the area of IQ wishes to measure a sample of children using the WISC III. The standard deviation on the WISC-III is 15. How large a sample should be selected if the researcher wishes to be .99 accurate to within 3 IQ points?

Any value which is based on having measured a sample is called

With a known population mean of 50 and a known standard error of the mean of 4.00, what is the probability of selecting at random a sample whose mean is 52 or greater?

A population may never share more than one common trait.

With a known population mean of 75 and a known standard error of the mean of 5.00, what is the probability of selecting at random a sample whose mean is 70 or less?

The sample selected by the Literacy Digest in 1936 was

The range of values for the sampling distribution of means

When a group is truly selected randomly from a population, the probability of its mean value being higher than the parameter mean is

The fact that the distribution of random sample means is assumed to approximate normality is expressed in

It is assumed that random sample

In order to make accurate population estimates, the sample must be

The null hypothesis for the z test, since it is based on chance, must always be accepted.

Stratified sampling refers to the actual number of different samples being selected from a single population.

The reason the Literary Digest's 1936 election poll was so inaccurate, was that

When samples are selected randomly, they are assumed to be representative of the population.

Introduction to Statistics

Percentages, Graphs and Measures of Central Tendency

Measures of Variability

The Normal Curve and Z Score

Z Scores, T Scores and Other Normal Curve Transformations

Probability

Parameter Estimates

The Fundamentals of Research Methodology

The Hypothesis of Difference

The Hypothesis of Association: Correlation

Analysis of Variance

Nominal Categorical Data and the Chi Square

Regression Analysis

Repeated-Measures and Matched-Subjects Designs Interval Data

Non-Parametrics Revisited: the Ordinal Case

Tests and Measurements

Filters

Exam 7: Statistics and Parameters

A biased sample can never be

With a known population mean of 1500, and a known standard error of the mean of 42.50, what is the probability of selecting at random a sample whose mean is 1450 or less?

By definition, one can never obtain a statistic unless

A researcher in the area of IQ wishes to measure a sample of children using the WISC III. The standard deviation on the WISC-III is 15. How large a sample should be selected if the researcher wishes to be .99 accurate to within 5 IQ points?

A researcher in the area of IQ wishes to measure a sample of children using the WISC III. The standard deviation on the WISC-III is 15. How large a sample should be selected if the researcher wishes to be .99 accurate to within 3 IQ points?

Any value which is based on having measured a sample is called

With a known population mean of 50 and a known standard error of the mean of 4.00, what is the probability of selecting at random a sample whose mean is 52 or greater?

A population may never share more than one common trait.

With a known population mean of 75 and a known standard error of the mean of 5.00, what is the probability of selecting at random a sample whose mean is 70 or less?

The sample selected by the Literacy Digest in 1936 was

The range of values for the sampling distribution of means

When a group is truly selected randomly from a population, the probability of its mean value being higher than the parameter mean is

The fact that the distribution of random sample means is assumed to approximate normality is expressed in

It is assumed that random sample

In order to make accurate population estimates, the sample must be

The null hypothesis for the z test, since it is based on chance, must always be accepted.

Stratified sampling refers to the actual number of different samples being selected from a single population.

The reason the Literary Digest's 1936 election poll was so inaccurate, was that

When samples are selected randomly, they are assumed to be representative of the population.

Introduction to Statistics

Percentages, Graphs and Measures of Central Tendency

Measures of Variability

The Normal Curve and Z Score

Z Scores, T Scores and Other Normal Curve Transformations

Probability

Parameter Estimates

The Fundamentals of Research Methodology

The Hypothesis of Difference

The Hypothesis of Association: Correlation

Analysis of Variance

Nominal Categorical Data and the Chi Square

Regression Analysis

Repeated-Measures and Matched-Subjects Designs Interval Data

Non-Parametrics Revisited: the Ordinal Case

Tests and Measurements

Filters