a, What is a key difference between an EXPERIMENTAL STUDY and aCORRELATIONAL STUDY?

Group of answer choices

In an experiment, the researcher actively manipulates theindependent variable and measures the dependent variable todetermine if the independent variable had an effect on thedependent variable. In a correlational study, the researchermeasures both variables to determine if there is a relationshipbetween the two variables.

Experimental research studies summarize and organize sample datawhereas correlational studies make decisions about populationscores and relationships based on sample data.

In a correlational study, the researcher actively manipulatesthe independent variable and measures the dependent variable todetermine if the independent variable had an effect on thedependent variable. In an experimental study, the researchermeasures both variables to determine if there is a relationshipbetween the two variables.

b. Whereas a bar chart is most appropriate to graph nominaldata, the histogram is most appropriate to graph ____________ data;and if we detect in the histogram a positive skew, we would knowthat the _____________ is greater than the _______________.

Group of answer choices

ratio; mean; median

ratio and ordinal; mode; mean and median

interval and ordinal and nominal; median; mean

ordinal; median; mean

c. This is the saddest story ever told: Being on the verge ofaccepting Ale's marriage proposal, Pam just needed to be sure thatshe would marry the "statistics buff" he was always boasting to be.So, one day Pam set out to test the veracity of his claim, and thatwould ultimately determine whether they would tie the knotforever:

Pam began, "Say I divide the squared sumof x by N; I then take the result and subtract it from the sumof x squared. This result gets divided N. What is the name of thisstatistical computation?" Without any hesitation, Alearrogantly grunted and replied: "That's an easy one; it's thesample standard deviation, a measure of variability!"Tearfully, Pam ended their relationship on the spot. What was wrongwith Ale's answer?

Group of answer choices

the standard deviation is a measure of central tendency

the answer should have been the sample range

the correct answer should have been the sample variance

d. Professor Nicole Barbari found in her research the Pearson rcorrelation coefficient to be rout = -.749. What twothings can she deduce from the coefficient automatically?

Group of answer choices

negative direction and strong relationship

weak relationship and positive direction

she will reject Ho

the more x, the more y and weak relationship

e. What statistical procedure will solve this problem? Anelementary teacher predicts students in a randomly selected samplewill have more nightmares after watching Jaws than Pretty Woman.The participants are shown Jaws first. The next day, the sameparticipants are shown Pretty Woman.

Group of answer choices

dependent t

one sample t

one sample z

independent t