An educator wishes to determine whether extra computer instruction on quantitati
ID: 3156735 • Letter: A
Question
An educator wishes to determine whether extra computer instruction on quantitative reasoning increases the math achievement scores of fourth graders. After being matched on the basis of IQ, random assignment dictates who, in each matched pair of fourth graders, receives extra computer instruction. Differences between mean scores on the math achievement test should be analyzed with a
Question options:
t for one sample.
t for two independent samples.
t for two related samples.
t for correlation coefficient.
On the basis of their applications for admission, one hundred college freshmen are randomly assigned, in equal numbers, to room with sophomore students having either similar or dissimilar vocational goals. At the end of their freshman year, differences between the GPAs for the resulting two groups of freshmen should be analyzed with a t test for
Question options:
one sample.
two independent samples.
two related samples.
a correlation coefficient.
Another psychologist objects to the previous investigation, claiming that it lacks a control for the placebo effect. Instead, the psychologist proposes that pre- and post-workshop scores should be compared for not one but two randomly assigned groups of students: one group receiving the intensive therapeutic workshop and the other group receiving an intensive, non-therapeutic workshop. Differences between these two groups should be evaluated with a t test for
Question options:
one sample.
two independent samples.
two related samples.
a correlation coefficient.
Clocked speeds of randomly selected motorists are compared with the posted speed limit of 65 miles per hour. The appropriate statistical test is a t test for
Question options:
one sample.
two independent samples.
two related samples.
a correlation coefficient.
Groups of schizophrenics and non-schizophrenics are compared based on the total number of trials, to a maximum of thirty, before the strength of each individual's startle reaction to loud noises diminishes below some predetermined value. The appropriate statistical test is a
Question options:
t for two independent samples.
t for two related samples.
one-variable chi-square.
two-variable chi-square.
t for one sample.
t for two independent samples.
t for two related samples.
t for correlation coefficient.
Explanation / Answer
11. The samples -schizophrenics and non-schizophrenics are independnet, compute t for two independnet samples.
7. Here, clocked speed of randomly selected motorists (xbar) is compared to posted speed (mu). This accounts for 1-sample t test.
6. Here two groups receiving intensive theraputic workshop and non-intensive therapeutic workshop are independent (pre - post workshop scores are calculated for each groups independently). The scores are then compared. This account sfor two-sample t test.
4. College freshmen were grouped with sophomores with similar or dissimilaar vocational goals. These are two -independent samples and accounts for two-sample t test.
1. This account sfor t for related sample test. (data were matched)
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.