114 Answered Questions for the topic AP statistics

Ap Statistics

10/01/16

Does a least squares regression line fit a set of data well if r-squared is high, but there is a clear pattern in its residual plot?
For my least squares regression line, r squared is .9915 (pretty high), and there's a bit of a curved pattern in the residual plot. Does this specific regression line fit its data well, or poorly?
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Ap Statistics

01/14/16

Please will somebody explain to me how to do this?
A factory makes silicon chips for use in computers. It is known that about 90% ofthe chips meet specifications. Every hour a sample of 18 chips is selected at random for testing and the number of... more
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Ap Statistics

01/02/16

What is the probability that the first three you call are owned by women?
The 2000 census revealed that 26% of firms are owned by women. You call some firms locally assuming the national percentage is true in your area. What is the probability that the first three you... more
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Ap Statistics Math Statistics Concept

09/05/15

The meaning of the center in Statistics
Hi all,   I have a question about Statistics. I've just recently started studying AP Statistics and am wondering exactly what the center of a distribution represents. And what does it mean when... more
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Ap Statistics

04/06/15

Is there a significant difference between the population proportions? State appropriate hypotheses for a significance test to answer this question
As part of the Pew Internet and Americna Life project, researchers surveyed a random sample of 800 teens and a seperate random sample of 400 young adults.For the teens, 79% said that they owned an... more
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10/05/14

Stats Question
1)Rejecting the null hypothesis when the research hypothesis is false is a. effect size. b. power. c. a Type I error. d. a Type II error 2)Failing to reject the null hypothesis when the... more
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Ap Statistics Math Statistics Math Help

10/05/14

Stats help Mult
1)In a t test for dependent means, 15 participants are each tested twice. This makes a total of 15 "before" scores and 15 "after" scores. What are the degrees of freedom? a. 15 b. 14 c. 30 d.... more
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10/03/14

Stats Help Please Please
A sports psychologist gave a questionnaire about healthy eating habits to randomly selected professional athletes. The results are displayed below. Using the α =.05 significance level, is there a... more
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10/03/14

Stats Help help
1)You conducted a t test for independent means, and found that the t score equaled 0. This means that a. the two population means must be equal. b. the two population variances must be equal. c.... more
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10/03/14

Multiple Choice Question
The most likely way for a t test to be presented in a research article for a study with 25 participants is a. t (25) < significant b. t (25) = 3.01, p < .05 c. t (24) = 2.94, p <... more
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10/03/14

Statistics in Human Behavior
The mean of a self-worth measure in the population of adult males is 30.00. A researcher is interested in whether females report differing levels of self-worth. The researcher randomly samples 150... more
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09/29/14

Stats Help Please
A researcher is interested in increasing feelings of self-confidence in adolescents. He randomly selects 100 adolescents from the population and randomly assigns 50 individuals to a treatment... more
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Ap Statistics

09/16/14

how do you find the IQR in a ogive graph
i am having trouble finding how my teacher got a number by using the IQR formula (Q3-Q1) but how do i find those quartiles in the ogive graph and how do i calculate it to get the IQR? that is... more
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Ap Statistics

12/16/13

What's the difference between cdf and pdf in statistics?
cdf stands for Cumulative Distribution Function  pdf stands for Probability Distribution Function   Thanks
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