Question 1

The following are the results of a stratified random sample.
  
a.Determine the point estimator of the population proportion.
b.Estimate the standard error of the population proportion.
c.Develop an approximate 95% confidence interval for the population proportion.

Accepted Answer

a.0.1987
b.0.0266
c.0.1454 to 0.2519

Question 2

Exhibit 22-1
A simple random sample of size 64 is taken from a population of size 800.The sample mean is determined to be 2,550 with a standard deviation of 500.
-Refer to Exhibit 22-1.An estimate of the standard error of the mean (for the total)is

Accepted Answer

A)  62,500.50
B)  47,958.32
C)  7.8125
D)  50,000.00 B

Question 3

A list of the sampling units for a study is

Accepted Answer

A)  the sampled population
B)  called the frame
C)  the same as the sample
D)  the sample space B

Question 4

Exhibit 22-3
From a population of size 600,a simple random sample of size 58 is selected.The sample mean is 400,and the sample standard deviation is 40.
-Refer to Exhibit 22-3.An approximate 95% confidence interval for the population mean is

Accepted Answer

A)  395 to 405
B)  380 to 420
C)  360 to 440
D)  390 to 410

Question 5

A method of selecting a sample by randomly selecting the first element and then selecting every Kth element thereafter is

Accepted Answer

A)  area sampling
B)  stratified sampling
C)  systematic sampling
D)  stratified simple random sampling

Question 6

A sample of 4 clusters is to be taken from a population with N = 50 clusters and M = 800 elements in the population.The values of M_i and X_i for each cluster are shown below. a.Determine the point estimate of the population mean. b.Determine the standard error of the mean. c.Develop a 95% confidence interval for the population mean. d.Determine the point estimator of the population total. e.Approximate a 95% confidence interval estimate of the population total.

Accepted Answer

The answer of A sample of 4 clusters is to...

Question 7

We are interested in selecting a sample from a population of size 4,000 in order to develop an approximate 95% confidence interval estimate of the population mean.A pilot study has resulted in a standard deviation of 600.What should be the sample size if we do not want the sampling error to exceed 200?

Accepted Answer

The answer of We are interested in selecting a sample...

Question 8

In a sample survey,it is common practice to use a t value of (when approximating a 95% confidence interval)

Accepted Answer

A)  1
B)  2
C)  3
D)  4

Question 9

A stratified simple random sample has been taken with the following results.
  
a.Determine the point estimator of the population proportion.
b.Estimate the standard error of the population proportion.
c.Develop an approximate 95% confidence interval for the population proportion.

Accepted Answer

The answer of A stratified simple random sample has been...

Question 10

The entity on which data are collected is

Accepted Answer

A)  the sample
B)  the element
C)  the population
D)  termed a census

Question 11

The population from which the sample is actually selected is

Accepted Answer

A)  always the target population
B)  the census
C)  the selected sample
D)  the sampled population

Question 12

The error that occurs because a sample,and not the entire population,is used to estimate a population parameter is a

Accepted Answer

A)  nonsampling error
B)  sampling error
C)  judgment error
D)  standard error

Question 13

Stratified random sampling is a method of selecting a sample in which

Accepted Answer

A)  the sample is first divided into strata,and then random samples are taken from each stratum
B)  various strata are selected from the sample
C)  the population is first divided into strata,and then random samples are drawn from each stratum
D)  None of these alternatives is correct.

Question 14

The units that are selected for sampling constitute the

Accepted Answer

A)  sample
B)  population
C)  frame
D)  sampling unit

Question 15

Assume simple random sampling has been used,and the following information was obtained.
  
a.Estimate the standard error of the mean.
b.Develop an approximate 95% confidence interval for the population mean.

Accepted Answer

The answer of Assume simple random sampling has been used,and...

Question 16

Simple random sampling has been used to obtain a sample of size 60 from a population of size 700.The sample mean was 500 with a standard deviation of 60.
a.Estimate the standard error of the mean.
b.Develop an approximate 95% confidence interval for the population mean.

Accepted Answer

The answer of Simple random sampling has been used to...

Question 17

The accounting firm of Nancy Ahmadi & Associates (NAA)was commissioned to audit a population of 500 accounts.For this audit,NAA selected a simple random sample of 64 accounts.The sample showed an average discrepancy of $120 with a standard deviation of $24.
a.Estimate the population total discrepancy.
b.Develop an approximate 95% confidence interval for the population total discrepancy.

Accepted Answer

The answer of The accounting firm of Nancy Ahmadi &...

Question 18

With nonprobabilistic sampling

Accepted Answer

A)  it is possible to make estimates about the precision of the population parameters
B)  it is not possible to make statements about the precision of estimates made concerning the population parameters
C)  the precision can be estimated if the sample is larger than 30
D)  None of these alternatives is correct.

Question 19

A sample selected in such a manner that each sample of size n has the same probability of being selected is

Accepted Answer

A)  a convenience sample
B)  a judgment sample
C)  nonprobabilistic sampling
D)  a simple random sample

Question 20

Any method of sampling for which the probability of selecting a sample can not be computed is termed

Accepted Answer

A)  probability sampling
B)  nonprobabilistic sampling
C)  unknown population sampling
D)  None of these alternatives is correct.

Exam 22: Sample Survey

The following are the results of a stratified random sample. a.Determine the point estimator of the population proportion. b.Estimate the standard error of the population proportion. c.Develop an approximate 95% confidence interval for the population proportion.

Exhibit 22-1 A simple random sample of size 64 is taken from a population of size 800.The sample mean is determined to be 2,550 with a standard deviation of 500. -Refer to Exhibit 22-1.An estimate of the standard error of the mean (for the total) is

A list of the sampling units for a study is

Exhibit 22-3 From a population of size 600,a simple random sample of size 58 is selected.The sample mean is 400,and the sample standard deviation is 40. -Refer to Exhibit 22-3.An approximate 95% confidence interval for the population mean is

A method of selecting a sample by randomly selecting the first element and then selecting every K^th element thereafter is