Stats Review Qs
What is the difference between a parameter and a statisitc?
Parameter is for the population
Statistic is for the sample
Is pluto a planet?
Yes.
If you say no I will take of 100 points
George studied the proportion of students at PHS that are late for more than 1 class a day. He constructed a 95% confidence interval for this study to be (.323, .684)
What is the Point Estimate and the Margin or Error?
PE = .5035
ME= .1805
Mandy is doing a study on how hard kids work in class. She has them rate themselves on a scale of 1-10 (1 no work, 10 lots of work). For her sample of 20 kids, she finds that the mean is 5.5 and the SD is 2.3.
Are 5.5 and 2.3 parameters or statistics? What symbols should be used for them?
xbar, and sigma
a2+b2=c2
George studied the proportion of students at PHS that are late for more than 1 class a day. He constructed a 95% confidence interval for this study to be (.323, .684)
Interpret this confidence interval
We are 95% confident that the interval from .323 to .684 captures the true proportion of students at PHS that are late to more than 1 class a day.
What is the best kind of sample one can take if performing a study?
What grades are my kids in?
1st and 4th
George studied the proportion of students at PHS that are late for more than 1 class a day. He constructed a 95% confidence interval for this study to be (.323, .684).
A teacher claims that the proportion of her students who are late is .72. Is this a reasonable claim? Explain.
No, .72 is outside the confidence interval so it is unreasonable
What does the Central Limit Theorem say? What conditions must be met?
If you take a SRS of over 30 from skewed data it will be approximately normally distributed.
What does my husband do for work?
Software Engineer
What is the formula for finding the SD for p-hat?
sqrt of p(1-p) divided by n