All Matches

Solution Library

Expert Answer

Textbooks

Search Textbook questions, tutors and Books

Oops, something went wrong!

Change your search query and then try again

Result Not Found

Books FREE
Tutors
Study Help
Hire a Tutor
AI Study Help New

Search
Sign In
Register

study help
business
statistics informed decisions using data

Questions and Answers of Statistics Informed Decisions Using Data

AccordingtoStatisticsCanada, for theCanadianpopulationhavingincomein2019, annualincomehadamedianof$35,000andmeanof$46,700.Whatwouldyoupredict abouttheshapeofthedistribution?Why?
Analyzethe Carbon_West data fileatthebook’swebsiteby(a) constructingafrequency distribution andahistogram,(b) findingthemean,median,andstandarddeviation.Interpreteach.
FortheGSSdataonnumberofgoodfriends(searchat https://sda.berkeley.edu/sdaweb/analysis/?dataset=gss18 for variable NUMFREND), theresponses(1,2,3,4,5, 6, 7,8,9, . .. ,
Explainwhetheranexperimentoranobservationalstudywouldbemoreappropriate to investigatethefollowing:(a) Whethercitieswithhigherunemploymentratestendtohavehighercrimerates.(b)
Thestudentdirectoryforalargeuniversityhas400pageswith130namesperpage,a total of52,000names.Usingsoftware,showhowtoselectasimplerandomsampleof 10 names.
Giveanexampleofavariablethatis(a) technicallydiscretebutessentiallycontinuous for purposesofdataanalysis;(b) potentiallycontinuousbuthighlydiscreteintheway it ismeasuredinpractice.
InanalyzingdataaboutpatientswhodevelopedCovid-19fromcoronavirus,many researchstudiesusedthescale(1.Death;2.Hospitalizedwithinvasiveventila-tion;
Giveanexampleofavariablethatis (a) categorical; (b) quantitative; (c) discrete; (d)continuous.
Identifyeachofthefollowingvariablesascategoricalorquantitative: (a) Numberof smartphones thatyouown; (b) Countyofresidence; (c) Choice ofdiet(vegetarian, nonvegetarian); (d) Distance,
The Students data fileat http://stat4ds.rwth-aachen.de/data showsresponsesofa class of60socialsciencegraduatestudentsattheUniversityofFloridatoaquestionnaire that askedabout gender (1 = female, 0 =
Inthe 2018 electionforSenateinCalifornia,aCNNexitpollof1882votersstatedthat52.5% votedfortheDemocraticcandidate,DianeFeinstein.Ofall11.1millionvoters,54.2% votedforFeinstein.(a)
Which of the following constitute continuous variables?(a) Number of times a score of 180 is achieved in a darts match(b) Gender(c) Temperature(d) All of the above
Experimental designs are characterised by:(a) Fewer than two conditions(b) No control condition(c) Random allocation of participants to conditions(d) None of the above
In a study with gender as the manipulated variable, the IV is:(a) Within participants(b) Correlational(c) Between participants(d) None of the above
Which of the following are true of correlational designs?(a) They have no IV or DV(b) They look at relationships between variables(c) You cannot infer causation from correlations(d) All of the above
Which of the following could be considered as categorical variables?(a) Gender(b) Brand of baked beans(c) Hair colour(d) All of the above
Between-participants designs can be:(a) Either quasi-experimental or experimental(b) Only experimental(c) Only quasi-experimental(d) Only correlational
Which of the following statements are true of experiments?(a) The IV is manipulated by the experimenter(b) The DV is assumed to be dependent upon the IV(c) They are difficult to conduct(d) (a) and
Quasi-experimental designs have:(a) An IV and a DV(b) Non-random allocation of participants to conditions(c) No IV or DV(d) (a) and (b) above
A continuous variable can be described as:(a) Able to take only certain discrete values within a range of scores(b) Able to take any value within a range of scores(c) Being made up of categories(d)
Which of the following are problems associated with within-participants designs?(a) There is an increased likelihood of practice or fatigue effects(b) Participants are more likely to guess the nature
According to Streiner (2002) how efficient are studies that dichotimise continuous variables when compared with studies that do not?(a) 100%(b) 95%(c) 67%(d) 50%
A researcher has just conducted a correlational study investigating the relationship between amount of alcohol drunk by fans of the home team before a football match and the number of goals scored by
In a within-participants design with two conditions, if you do not use counterbalancing of the conditions then your study is likely to suffer from:(a) Order effects(b) Effects of time of day(c) Lack
You have conducted a study that shows that the earlier people get up, the more work they get done. Which of the following are valid conclusions?(a) There is not necessarily a causal relationship
Which of the following designs is least likely to enable us to establish causal relationships between variables?(a) Experimental design(b) Quasi-experimental design(c) Correlational design(d)
Demand effects are possible confounding variables where:(a) Participants behave in the way they think the experimenter wants them to behave(b) Participants perform poorly because they are tired or
Suppose you wanted to conduct a study to see if depressed individuals bite their nails more than non-depressed individuals. Which of the following would be the best way to proceed?(a) Measure
Which of the following might be suitable IVs in a quasi-experimental study?(a) Gender(b) Whether or not someone had Generalised Anxiety Disorder(c) Students versus non-students(d) All of the above
In within-participant designs order effects occur when:(a) Participants get tired in later conditions(b) Participants perform equally well in all conditions(c) Participants have trouble obtaining
Which of the following are problems associated with dichotomising continuous variables?(a) Loss of experimental power(b) Spurious effects may occur(c) There is a serious loss of information(d) All of
Dr Genius has conducted a study comparing memory for adjectives with that for nouns.She randomly allocates 20 participants to two conditions. She then presents to one of the groups of 10 participants
Using the data from Exercise 1:■ If you input the data as a within-participants design, then input it now as a betweenparticipants design.■ If you input the data as a between-participants design,
You are given the job of finding out whether or not changing the lighting in an office from normal fluorescent lighting to red lighting will increase the alertness of data inputters and thereby
A group of final-year students decides to see if the lecture material in Dr Boering’s lectures can be made more memorable. They decide that the best way to do this would be to take hallucinogenic
Which one of the following represents the best estimate of the population mean?(a) The sample mean(b) The mean of several sample means(c) The mode of several sample means(d) The median of several
If you obtained a sample of data that was relatively normally distributed and had no extreme scores, which measure of central tendency would you opt for?(a) Mode(b) Median(c) Mean(d) None of the above
Which of the following measures of central tendency are sensitive to extreme scores?(a) Mode(b) Median(c) Mean(d) None of the above
Given the following graph, how would you describe the distribution?(a) Normal (b) Positively skewed (c) Negatively skewed (d) Bimodal
The standard deviation is equal to:(a) The variance(b) The square-root of the variance(c) The variance squared(d) The variance divided by the number of scores
What is the relationship between sample size and sampling error?(a) The larger the sample size, the larger the sampling error(b) The larger the sample size, the smaller the sampling error(c) Sample
The mode is:(a) The frequency of the most common score divided by the total number of scores(b) The middle score after all the scores have been ranked(c) The most frequently occurring score(d) The
In box plots an extreme score is defined as:(a) A score that falls beyond the inner fence(b) A score that falls between the hinges and the inner fence(c) A score that falls between the inner fence
A normal distribution should have which of the following properties?(a) Bell-shaped(b) Be symmetrical(c) The tails of the distribution should meet the x-axis at infinity(d) All of the above
If you randomly select a sample of 20 pandas (sample A), then select a sample of 300 pandas (sample B) and calculate the mean weight for each sample, which is likely to give a better estimate of the
What sort of relationship is indicated by a scattergram where the points cluster around an imaginary line that goes from the bottom left-hand corner to the top right-hand corner?(a) Positive(b)
What is the mean of the following set of scores: 5, 7, 10, 12, 18, 20, 24, 22, 24, 25?(a) 145(b) 17.2(c) 16.7(d) 167
If you have a negatively skewed distribution then:(a) The mean, median and mode are equal(b) The right-hand tail is extended(c) The left-hand tail is extended(d) None of the above
A perfectly normal distribution:(a) Is bell-shaped, symmetrical and has tails that cross the x-axis at infinity(b) Is only applicable for normal people(c) Has equal mean, median and modes(d) (a) and
When you have categorical variables and are simply counting the frequency of occurrence of each category then your measure of central tendency should be:(a) Mode(b) Median(c) Mean(d) None of the above
Given the following set of data (8, 7, 9, 12, 14, 10, 14, 11, 13, 14), what are the mean, median and mode?(a) 11.2, 11.5, 14(b) 112, 12, 14(c) 10, 5, 14(d) 10, 12, 14
If a distribution is described as platykurtic, then it is:(a) Very peaked(b) Very flat(c) Bimodal(d) Very thin
Having calculated the variance of a set of data with 12 participants to be 36, what would the standard deviation be?(a) 36(b) 1296(c) 6(d) 3
Which of the following statements are true?(a) Parameters describe samples and statistics describe populations(b) Statistics describe samples and populations(c) Parameters describe populations and
Given the following graph, how would you describe the distribution?(a) Normal (b) Positively skewed (c) Negatively skewed (d) Bimodal
What is the probability 1 in 5 expressed as a percentage?(a) 14%(b) 25%(c) 20%(d) 32%
What is the relationship between sample size and sampling error?(a) The larger the sample size, the larger the sampling error(b) The larger the sample size, the smaller the sampling error(c) Sample
If we have a 95% confidence interval of 3 ± 2, what does it mean?(a) The population mean is definitely between 1 and 5(b) We are 95% sure that the population mean falls between 3 and 2(c) We are 95%
What are the scores in the standard normal distribution?(a) Extreme scores(b) z-scores(c) Standard deviation scores(d) Both (b) and (c) above
The standard error is:(a) The square-root of the mean(b) The square of the standard deviation(c) The standard deviation divided by the mean(d) The standard deviation divided by the square-root of the
If you have a probability of 33%, what is it expressed as a decimal?(a) 0.033(b) 0.33(c) 0.23(d) 0.133
The standard error tells us:(a) The degree to which our sample means differ from the mean of the sample means(b) The degree to which our sample means differ from the population mean(c) The degree to
What would we multiply the standard error by to help us get our 95% confidence intervals?(a) 95(b) The square-root of the sample size(c) The standard deviation(d) 1.96
If you had a z-score of 2.33 this would tell you that:(a) Your score was 2.33 standard deviations above the mean(b) Your score was 2.33 standard deviations below the mean(c) There was a probability
If an event has a probability of 95% of occurring, what does this mean?(a) The event is likely to occur 5 times out of every 100(b) The event is likely to occur 95 times out of every 100(c) The event
Which career should you choose if your weightlifting and pottery scores are as follows?Weightlifting: Your score is 52 (sample mean = 55, SD = 12)Potter: Your score is 50 (sample mean = 58, SD =
Which of the following statements are true in reference to inferential statistics?(a) They merely describe our data(b) We are able to use them to draw conclusions about populations from sample
If you obtain a score of 13 on an anxiety questionnaire and you know that the population mean and standard deviation are 20 and 5 respectively, what is your z-score?(a) −2.33(b) −1.4(c) 1.33(d) 0
If you have a population of scores that has a flat (i.e. not normal) distribution, then the distribution of many sample means will be:(a) Flat(b) Bimodal(c) Negatively skewed(d) Normal
Which of the following gives the best estimate of the population mean?(a) Sample mean(b) The mean of several sample means(c) The standard deviation(d) The standard error
For a set of data we find that we have a standard deviation of 42 and a sample size of
What is the standard error?(a) 0.339(b) 2.95(c) 21.68(d) 10.5
If you draw 100 samples from a population and plot all their means as a frequency histogram, then you have a:(a) Mean distribution(b) Skewed distribution(c) Sampling distribution(d) None of the above
Given a standard error of 5.2 with a sample size of 9, what is the standard deviation?(a) 1.73(b) 15.6(c) 46.8(d) 0.556
Which of these could you not generate confidence intervals for?(a) A mean(b) A correlation coefficient(c) The mean difference between scores(d) None of the above
If we have a negatively skewed population, what shape will the sampling distribution of the mean of samples drawn from this population be?(a) Negatively skewed(b) Positively skewed(c) Normal(d) It is
A Type II error occurs when:(a) The null hypothesis is not rejected when it should be(b) The null hypothesis is rejected when it should be(c) The null hypothesis is rejected when it should not have
What is the basis or logic of inferential statistical tests?(a) To work out the probability of obtaining an effect due to sampling error when the null hypothesis is true(b) To work out the
If you obtain a one-tailed p-value of 0.02 then the equivalent two-tailed p-value is:(a) 0.01(b) 0.04(c) 0.02(d) 0.4
If you predict that two variables A and B will be related, what is the null hypothesis?(a) That there is no relationship between A and B(b) That A will be greater than B(c) That there is no
The power of an experiment is:(a) α(b) The ability of the experiment to reject the null hypothesis if it is, in fact, false(c) The sensitivity of participants to your experimental manipulation(d)
When we predict that condition A will be greater than condition B, we have made:(a) A one-tailed prediction(b) A two-tailed prediction(c) A uni-directional prediction(d) Both (a) and (c) above
The probability that an effect has arisen due to sampling error given that the null hypothesis is true is denoted as:(a) Negligible(b) β(c) α(d) None of the above
If you obtain a two-tailed p-value of 0.02 the equivalent one-tailed p-value would be:(a) 0.01(b) 0.04(c) 0.02(d) 0.4
If we predict that there will be a difference between condition A and condition B, we have made:(a) A one-tailed prediction(b) A two-tailed prediction(c) A null prediction(d) Both (b) and (c) above
If you obtain a p-value of 4%, what does this mean?(a) The probability that the null hypothesis is true is 4%(b) The probability that the null hypothesis is false is 4%(c) The probability of
If you predict that there will be a difference between condition A and condition B, what is the null hypothesis?(a) That condition A will be greater than condition B(b) That condition B will be
If we reject the null hypothesis when it is, in fact, true then we have:(a) Made a Type I error(b) Made a Type II error(c) Made scientific progress(d) Both (b) and (c) above
Which of the following are the assumptions underlying the use of parametric tests?(a) The data should be normally distributed(b) The samples being tested should have appproximately equal variances(c)
A Type II error means:(a) We have rejected the null hypothesis when it is, in fact, true(b) We have accepted the experimental hypothesis when it is false(c) We have accepted the null hypothesis when
A researcher has conducted a study on reaction times with 20 participants in each of two conditions. She finds that the variance for the first condition is 2 seconds and for the second condition is
How do we denote power?(a) α(b) β(c) 1 − α(d) 1 − β
Why do we usually set our criterion for significance at 0.05?(a) This is the traditional level used by most psychologists(b) This represents a good balance between making Type I and Type II errors(c)
When we convert our data into a score from a probability distribution what do we call the value we obtain?(a) Significant(b) Not significant(c) The test statistic(d) The power of the study
Imagine we conduct two studies. In study A we have 1000 participants and obtain a p-value of 0.01, whereas in study B we have only 20 participants and a p-value of 0.05. In which of these two studies
If you find in a study that your p-value is 0.05, what is the probability of the alternative hypothesis being true?(a) 0.05(b) 1 minus 0.05(c) We cannot work out the probability of the alternative
If 36% of the variation in scores on y has been accounted for by scores on x, how much variance is unexplained?(a) 64%(b) 36%(c) 6%(d) 0.6%
If two variables are totally independent, then the correlation between them is:(a) –0.1(b) –1.00(c) +1.00(d) zero
Of those below, which two variables show the strongest relationship?(a) ‘QOL’ and ‘family relationships’(b) ‘QOL’ and ‘age’(c) ‘mood’ and ‘QOL’(d) ‘mood’ and ‘age’
Which correlation is the weakest?(a) ‘QOL’ and ‘age’(b) ‘mood’ and ‘age’(c) ‘family relationships’ and ‘age’(d) ‘family relationships’ and ‘mood’

Showing 1300 - 1400 of 3906

First
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Last

Services

Sitemap
Fun
Definitions
Become Tutor
Study Help Categories
Recent Questions
Expert Questions

Company Info

Security
Copyrights
Privacy Policy
Terms & Conditions
SolutionInn Fee
Scholarship

Get In Touch

About Us
Contact Us
Career
Jobs
FAQ
Campus Ambassador

Secure Payment

Download Our App

© 2024 SolutionInn. All Rights Reserved