Question 1

A major limitation of nonrandom samples is that they are not appropriate for most statistical methods.

Accepted Answer

A) True 
 B)False

Question 2

Suppose the population of all public Universities shows the annual parking fee per student is $110 with a standard deviation of $18.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a mean of less than $92 is _______.

Accepted Answer

A) 0.3400 
B) 0.1600 
C) 0.0000 
D) 1.0000 
E) 0.7000 
A) 0.3400 
B) 0.1600 
C) 0.0000 
D) 1.0000 
E) 0.7000

Question 3

Saving time and money are reasons to take a sample rather than do a census.

Accepted Answer

A) True 
 B)False

Question 4

Pinky Bauer,Chief Financial Officer of Harrison Haulers,Inc.,suspects irregularities in the payroll system.If 10% of the 5,000 payroll vouchers issued since January 1,2000,have irregularities,the probability that Pinky's random sample of 200 vouchers will have a sample proportion of between .06 and .14 is ___________.

Accepted Answer

A) 0.4706 
B) 0.9706 
C) 0.0588 
D) 0.9412 
E) 0.8765 
A) 0.4706 
B) 0.9706 
C) 0.0588 
D) 0.9412 
E) 0.8765

Question 5

Suppose the population of all public Universities shows the annual parking fee per student is $110 with a standard deviation of $18.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a sample mean between $112 and $115 is _______.

Accepted Answer

A) 0.9738 
B) 0.7777 
C) 0.7823 
D) 0.1915 
E) 1.7561 
A) 0.9738 
B) 0.7777 
C) 0.7823 
D) 0.1915 
E) 1.7561

Question 6

The sampling distribution of   is close to normal provided that n≥30.

Accepted Answer

A) True 
 B)False

Question 7

A carload of steel rods has arrived at Cybermatic Construction Company.The car contains 50,000 rods.Claude Ong,manager of Quality Assurance,directs his crew measure the lengths of 100 randomly selected rods.If the population of rods have a mean length of 120 inches and a standard deviation of 0.05 inch,the probability that Claude's sample has a mean less than 119.985 inches is _____________.

Accepted Answer

A) 0.9974 
B) 0.0026 
C) 0.4987 
D) 0.0013 
E) 0.0030 
A) 0.9974 
B) 0.0026 
C) 0.4987 
D) 0.0013 
E) 0.0030

Question 8

On Saturdays,cars arrive at David Zebda's Scrub and Shine Car Wash at the rate of 80 cars per hour during the ten-hour shift.David wants a sample of 40 Saturday customers to answer the long version of his quality service questionnaire.He instructs the Saturday crew to select the first 40 customers.His sample is a __________.

Accepted Answer

A) convenience sample 
B) simple random sample 
C) systematic sample 
D) stratified sample 
E) cluster sample 
A) convenience sample 
B) simple random sample 
C) systematic sample 
D) stratified sample 
E) cluster sample

Question 9

Suppose 40% of all college students have a computer at home and a sample of 64 is taken.What is the probability that more than 30 of those in the sample have a computer at home?

Accepted Answer

A) 0.3686 
B) 0.1314 
C) 0.8686 
D) 0.6314 
E) 0.1343 
A) 0.3686 
B) 0.1314 
C) 0.8686 
D) 0.6314 
E) 0.1343

Question 10

Albert Abbasi,VP of Operations at Ingleside International Bank,is evaluating the service level provided to walk-in customers.Accordingly,he plans a sample of waiting times for walk-in customers.If the population of waiting times has a mean of 15 minutes and a standard deviation of 4 minutes,the probability that Albert's sample of 64 will have a mean less than 14 minutes is ________.

Accepted Answer

A) 0.4772 
B) 0.0228 
C) 0.9772 
D) 0.9544 
E) 1.0000 
A) 0.4772 
B) 0.0228 
C) 0.9772 
D) 0.9544 
E) 1.0000

Question 11

If the population is normally distributed,the sample means of size n=5 are normally
distributed.

Accepted Answer

A) True 
 B)False

Question 12

If a researcher selects every kth item from a population of N items,then she is likely conducting a systematic random sampling.

Accepted Answer

A) True 
 B)False

Question 13

In an instant lottery,your chance of winning is 0.1.If you play the lottery 100 times and outcomes are independent,the probability that you win at least 15 percent of the time is

Accepted Answer

A) 0.4933 
B) 0.5 
C) .15 
D) 0.0478 
E) 0.9213 
A) 0.4933 
B) 0.5 
C) .15 
D) 0.0478 
E) 0.9213

Question 14

Systematic sampling is a type of random sampling technique.

Accepted Answer

A) True 
 B)False

Question 15

Suppose a population has a mean of 450 and a variance of 900.If a random sample of size 100 is drawn from the population,the probability that the sample mean is between 448 and 453 is _______.

Accepted Answer

A) 0.4972 
B) 0.6826 
C) 0.4101 
D) 0.5899 
E) 0.9878 
A) 0.4972 
B) 0.6826 
C) 0.4101 
D) 0.5899 
E) 0.9878

Question 16

Suppose 30% of the U.S.population has green eyes.If a random sample of size 1200 U.S.citizens is drawn,then the probability that less than 348 U.S.citizens have green eyes is _______.

Accepted Answer

A) 0.2236 
B) 0.2764 
C) 0.2900 
D) 0.7764 
E) 0.3336 
A) 0.2236 
B) 0.2764 
C) 0.2900 
D) 0.7764 
E) 0.3336

Question 17

A population list,map,directory,or other source used to represent the population from which a sample is taken is called a frame.

Accepted Answer

A) True 
 B)False

Question 18

Suppose a population has a mean of 400 and a standard deviation of 24.If a random sample of size 144 is drawn from the population,the probability of drawing a sample with a mean between 395.5 and 404.5 is _______.

Accepted Answer

A) 0.9756 
B) 0.0244 
C) 0.0278 
D) 0.9722 
E) 1.0000 
A) 0.9756 
B) 0.0244 
C) 0.0278 
D) 0.9722 
E) 1.0000

Question 19

According to the central limit theorem,if a sample of size 100 is drawn from a population with a standard deviation of 80,the standard deviation of sample means would equal _______.

Accepted Answer

A) 0.80 
B) 8 
C) 80 
D) 800 
E) 0.080 
A) 0.80 
B) 8 
C) 80 
D) 800 
E) 0.080

Question 20

Suppose a population has a mean of 870 and a variance of 8,100.If a random sample of size 36 is drawn from the population,the probability that the sample mean is between 840 and 900 is _______.

Accepted Answer

A) 0.9544 
B) 0.6826 
C) 0.8185 
D) 0.5899 
E) 0.0897 
A) 0.9544 
B) 0.6826 
C) 0.8185 
D) 0.5899 
E) 0.0897

A major limitation of nonrandom samples is that they are not appropriate for most statistical methods.

Suppose the population of all public Universities shows the annual parking fee per student is $110 with a standard deviation of $18.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a mean of less than $92 is _______.

Saving time and money are reasons to take a sample rather than do a census.

Suppose the population of all public Universities shows the annual parking fee per student is $110 with a standard deviation of $18.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a sample mean between $112 and $115 is _______.

The sampling distribution of is close to normal provided that n≥30.

Suppose 40% of all college students have a computer at home and a sample of 64 is taken.What is the probability that more than 30 of those in the sample have a computer at home?

If the population is normally distributed,the sample means of size n=5 are normally distributed.

If a researcher selects every k^th item from a population of N items,then she is likely conducting a systematic random sampling.

In an instant lottery,your chance of winning is 0.1.If you play the lottery 100 times and outcomes are independent,the probability that you win at least 15 percent of the time is

Systematic sampling is a type of random sampling technique.

Suppose a population has a mean of 450 and a variance of 900.If a random sample of size 100 is drawn from the population,the probability that the sample mean is between 448 and 453 is _______.

Suppose 30% of the U.S.population has green eyes.If a random sample of size 1200 U.S.citizens is drawn,then the probability that less than 348 U.S.citizens have green eyes is _______.

A population list,map,directory,or other source used to represent the population from which a sample is taken is called a frame.

Suppose a population has a mean of 400 and a standard deviation of 24.If a random sample of size 144 is drawn from the population,the probability of drawing a sample with a mean between 395.5 and 404.5 is _______.

According to the central limit theorem,if a sample of size 100 is drawn from a population with a standard deviation of 80,the standard deviation of sample means would equal _______.

Suppose a population has a mean of 870 and a variance of 8,100.If a random sample of size 36 is drawn from the population,the probability that the sample mean is between 840 and 900 is _______.

Introduction to Statistics

Charts and Graphs

Descriptive Statistics

Probability

Discrete Distributions

Continuous Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

Analysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

Exam 7: Sampling and Sampling Distributions

A major limitation of nonrandom samples is that they are not appropriate for most statistical methods.

Suppose the population of all public Universities shows the annual parking fee per student is $110 with a standard deviation of $18.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a mean of less than $92 is _______.

Saving time and money are reasons to take a sample rather than do a census.

Suppose the population of all public Universities shows the annual parking fee per student is $110 with a standard deviation of $18.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a sample mean between $112 and $115 is _______.

The sampling distribution of is close to normal provided that n≥30.

Suppose 40% of all college students have a computer at home and a sample of 64 is taken.What is the probability that more than 30 of those in the sample have a computer at home?

If the population is normally distributed,the sample means of size n=5 are normally distributed.

If a researcher selects every kth item from a population of N items,then she is likely conducting a systematic random sampling.

In an instant lottery,your chance of winning is 0.1.If you play the lottery 100 times and outcomes are independent,the probability that you win at least 15 percent of the time is

Systematic sampling is a type of random sampling technique.

Suppose a population has a mean of 450 and a variance of 900.If a random sample of size 100 is drawn from the population,the probability that the sample mean is between 448 and 453 is _______.

Suppose 30% of the U.S.population has green eyes.If a random sample of size 1200 U.S.citizens is drawn,then the probability that less than 348 U.S.citizens have green eyes is _______.

A population list,map,directory,or other source used to represent the population from which a sample is taken is called a frame.

Suppose a population has a mean of 400 and a standard deviation of 24.If a random sample of size 144 is drawn from the population,the probability of drawing a sample with a mean between 395.5 and 404.5 is _______.

According to the central limit theorem,if a sample of size 100 is drawn from a population with a standard deviation of 80,the standard deviation of sample means would equal _______.

Suppose a population has a mean of 870 and a variance of 8,100.If a random sample of size 36 is drawn from the population,the probability that the sample mean is between 840 and 900 is _______.

Introduction to Statistics

Charts and Graphs

Descriptive Statistics

Probability

Discrete Distributions

Continuous Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

Analysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

If a researcher selects every k^th item from a population of N items,then she is likely conducting a systematic random sampling.