QUANTITATIVE RESEARC H

QUANTITATIVE RESEARC H

TECHNIQUES + STATISTICS -

PEREGRINE | 70 QUESTIONS WITH

100% CORRECT ANSWERS | UPDATED

& VERIFIED

Question : A company developed a smartphone whose

average lifetime is unknown. In order to estimate the average, 200 smartphones are randomly selected from a large production line and tested; their average is found to be 5

years. The 200 smartphones represent:

a sample

Correct answer: a sample

Question : Significance level

Correct answer: Measures the reliability of a statistical

inference

Question : inferential statistics

Correct answer: Process of using sample statistics

(mathematics) to draw conclusions about population parameters

Question : mutually exclusive

Correct answer: Events that cannot occur at the same time.

Question : sampling error

Correct answer: the difference between the results of random

samples taken at the same time

Question : non-sampling error

Correct answer: occurs when the sample data are incorrectly

collected, recorded, or analyzed. Three types of errors: data

acquisition errors, non-response errors (or bias), selection bias

Question : Design of a good survey components

Correct answer: short survey, short/simple questions, start

with demographic questions, ues dichtomous (yes-no) and multiple choice

Question : Direct observation

Correct answer: example: counts backpacks on campus for a day

Question : stratified random sample

Correct answer: a sample from selected subgroups of the

target population in which everyone in those subgroups has an equal chance of being included in the research

example: The manager of a customer service division wants

to know if the customers in the past 12 months are satisfied with their purchase of CD's. There are four types of CD's.

Question : Joint Probability

Correct answer: the probability of the intersection of two

events

Question : Union of two events

Correct answer: The union of events A and B is the event

containing all sample points that are in A or B or both

Question : Marginal Probability

Correct answer: the probability of a single event without

consideration of any other event

Question : Conditional Probability

Correct answer: the likelihood that a target behavior will

occur in a given circumstance

Question : Bayes Law

Correct answer: calculates posterior probability

Question : exhaustive

Correct answer: including everything possible; very thorough

or complete

Question : Central Limit Theorem (CLT)

Correct answer: The name of the theorem stating that the

sampling distribution of a statistic (e.g. x ) is approximately normal whenever the sample is large and random. Allows us to draw conclusions about the population based on strictly sample data.

Question : sampling distribution of the mean

Correct answer: 1. the sampling distribution of the mean has

a different mean from the original population

• the standard deviation of the sampling distribution of the

mean is referred to as the standard deviation

• if the original population is not normally distributed, the

sampling of the mean will be normal

Question : Suppose you are given 3 numbers that relate to the

number of people in a sample. The three numbers are 10, 20 and 30. If the standard deviation is 10, the standard error equals

Correct answer: 5.77

To find the standard deviation, find the mean of the data set ( 10, 20, 30) then calculate in excel. Watch video Bozeman Science Standard Error