Questions and Answers of Statistics Alive

A local newspaper reports the results of the reading achievement study in Exercise 2 above with the following headline: “Children Taught to Read by Phonics Outscore Students Taught to Read by Whole
You read a study that reports that p = .025. What confidence can you have that the results are due to the treatment rather than to mere sampling error?
Here, again, is the set of statistics test scores we worked with in Modules 3 and 4.Find the (a) Mode, (b) Median (by formula), (c) Mean for these data.
Maizy Lewis runs a large day care center. She wonders whether the presence of other children affects any single child’s willingness to perform simple motor tasks (assembling a puzzle, coloring a
A cognitive psychologist was curious as to why women tend to physically turn a map’s position to match the direction they are moving in, while men tend to keep the map in its original position and
A video arcade owner wondered if boys or girls spend more time playing the games once they enter the arcade. He recorded the playing time for boys and girls selected at random. No more than one
State whether the investigator should use independent samples, repeated measures, or matched samples:a. An investigator wants to know whether men or women select larger entrée portions in a
State whether the investigator should use independent samples, repeated measures, or matched samples:a. An investigator wants to know whether children from different socioeconomic levels differ in
State whether the investigator should use independent samples, repeated measures, or matched samples:a. An investigator wants to know if parental marital status is related to children’s reading
Joe is taking a bowling course for his physical education elective in college. He wonders whether the course significantly improves students’ bowling averages. He records his and his fellow
You read a study that reports that p = .07. What confidence can you have that the results are due to the treatment rather than to mere sampling error?
You read a study that reports that p = .04. What confidence can you have that the results are due to the treatment rather than to mere sampling error?
On a reaction time task, 11 randomly selected college students take an average of 0.60 s to respond to a prompt. On the same reaction time task, 11 randomly selected middleaged adults take an average
A teacher grades in such a way that exactly 50% of the students earn either a B or higher grade. If a student drawn at random takes four unrelated courses with this teacher, what is the probability

Showing 6600 - 6700 of 6614