## Friday, August 5, 2016

### Statistics Test Answers

Ques : A study finds that children who spend more hours in TV viewing score lower class grades in school. This correlation is an example of:
Ans  : Negative correlation

Ques : Arranging your target population in an ordered scheme from which participants or items are chosen at regular intervals is an example of:
Ans  : Systematic sampling

Ques : When a researcher doesn't know much about a certain problem and wants to gain more information about it, which research design will he use?
Ans  : Exploratory

Ques : There are two ways to present categorical data. One is by way of graphs, the other is by way of _________
Ans  : tables

Ques :  A sample of a population is:
Ans  : a subset of the population you are studying.

Ques : According to probability concepts, the chance that an event will never happen is:
Ans  : between 0 to 1

Ques : What is the probability of occurrence of a Type I error referred to as?
Ans  :  Level of significance

Ques : Standard deviation is the most common measure of __________.
Ans  : dispersion

Ques : _________ is one of the basic methods of inferential statistics that helps a researcher determine the difference between a real and a random pattern in a data set.
Ans  : Sample testing

Ques : A good research plan should include the following except:
Ans  : Participants

Ques : What will be the potential sampling frame(s) for a survey whose target population is infant children?
Ans  : medical facilities (such as hospitals and clinics) recording births within the past 12 months + households whose occupants include infants under 12 months old.

Ques : When the data values are tightly clustered around the mean, the bell shaped curve is:
Ans  :  steep

Ques : Ordinal numbers or data are primarily concerned with:
Ans  : rankings

Ques : A ________ is a graphic representation of data based on paired observations.
Ans  : pareto diagram

Ques : ______takes into account the distance of every point in the scatter plot from the trend line.
Ans  : Correlation

Ques :  ______ is the most frequent value that is present in your data.
Ans  : Mode

Ques : The _____ is a useful tool for assessing whether the means of two groups of variable are statistically different from each other.
Ans  :  T-test

Ques : Describe the relationship between the two variables in the above given scatter plot.
Ans  :  Positive

Ques : Which of the following form(s) part of descriptive analysis?
Ans  : All of the above

Ques : While following the Scientific Research steps, a researcher has to construct a hypothesis soon after defining the problem.
Ans  : True

Ques : The formula given above is that of:
Ans  : Z-score

Ques : The relationship between two variables is of two types. One is Linear, the other is:
Ans  : Curvilinear

Ques : If a company's production is consistently going down due to some reasons, which technique or method would you employ to analyze those reasons/causes?
Ans  : Simple linear regression

Ques : Which important information does the correlation analysis of variables give about the relationship between the variables?
Ans  : Type of relationship + Strength of relationship

Ques : When you are figuring out How to collect, process and analyze data, you are:
Ans  :  Designing your research

Ques : In statistical analysis, central tendency points to the clustering of the data around a _____________.
Ans  :  central value

Ques : Cluster sampling and Stratified sampling form part of Probability Sampling Methods.
Ans  : True

Ques : Cross tabulation of data is possible through the following:
Ans  : Contingency tables

Ques : Examples of Measures of central tendency include:
Ans  : Mean

Ques : While accepting or rejecting a null hypothesis , ________ are the regions that help to arrive at a decision.
Ans  : borderline regions

Ques : The advantage(s) of Scientific Research Method is/are:
Ans  : It is a systematic, controlled and empirical investigation of hypothesis.

Ques : The process in which data about the variables is collected and then predictions are made about future outcome is called:
Ans  : Regression analysis

Ques :  How is a Type II error symbolized as?
Ans  : ß

Ques : Which of the following is not an example of hypothesis?
Ans  : What percentage of people pass their driving test in the first attempt?

Ques : Commonly employed qualitative research methods include:
Ans  : Focus groups + Case studies

Ques : In the Sampling Process, soon after identifying the sampling method comes the process of:
Ans  : determining your sample size

Ques : How many types of major sampling methods are there?
Ans  : 4

Ques : The above-given image is an example of:
Ans  :  Bar graph

Ques : Find out the median of the following data set:

8126m; 8611m; 7817m; 8172m; 8076m; 8848m; 8598m
Ans  :  8172m

Ques : In marketing research, which measure of central tendency is often used in a set of ordinal data?
Ans  : Mode

Ques : Compute the Range for the given hourly wages (in \$) of janitors:

8, 10,12, 14, 16, 18
Ans  : \$10

Ques : In which chart is the data organized in a descending order and includes a trend line as well?
Ans  : Pareto chart

Ques : In which of the following fields is ANOVA used to make comparisons amongst groups?
Ans  : All of the above

Ques : The following are the steps in the process of Cluster sampling. Put them in the right order:

1)Randomly select the needed number of clusters for the sample.
2)Assign the population to different clusters.
3)Include all the population members of the selected cluster in the sample. Alternatively, select only a certain number of population members from each cluster (through simple or systematic random sampling) for the sample.
Ans  : 2,1,3
Ques :The events that are not affected by other outcomes are called:
Ans  : Independent events