AP stats discussion

Test Preparation AP Test Preparation
61

<p>thanks so much!</p>

62

<p>another question on chi square,when do you use chi CDF and PDF?..</p>

63

<p>if i’m not mistaken cdf for cumulative and pdf for single probability.</p>

<p>Can some1 help me with 2007 #8? let x rep random var whose distr is normal, w/ mean of 100 and sd of 10. which of the following is equivalent to P(x>115) </p>

<p>Answer is P(x<85)
need an explanation.</p>

64

<p>P(x>115) is 1.5 standard deviations and above. P(x<85) is 1.5 standard deviations and below. Since normal distribution, those values should be equivalent.</p>

65

<p>are there any online practice test that will give me a rough estimate of where i stand for the test tommorow?</p>

66

<p>[Released</a> AP Statistics Exam 2002 - Fullscreen](<a href=“http://www.scribd.com/full/14255151?access_key=key-2528po1bluqi4v1h6jbm]Released”>http://www.scribd.com/full/14255151?access_key=key-2528po1bluqi4v1h6jbm)
if u haven’t taken it yet…</p>

67

<p>can someone explain why you cant do t-tests on proportions? just curious…</p>

68

<p>My teacher just told me to just always use z-tests on proportions. Never knew why lol.
But I trust him.</p>

69

<p>Hey. 2 questions: can u use ur calculator for the multiple choice?
do u get the formula sheet for the multiple choice and free response or just the free response?
QUICK! PLEASE! MY STUDYING DEPENDS ON THISIISISIS!!!</p>

70

<p>Does anyone else use the mnemonics PANIC and PHANTOMS when doing Confidence Intervals and Hypothesis Tests, respectively?</p>

71

<p>i haven’t ever heard of that before? what are they?
guptasaintx, yes calculator is fine, and yes formual sheet for both…except the frq has the z t tables…</p>

72

<p>Ugh. I’m freaking out.
BTW, the test proctor DOES have the right to clear your calculator programs and such, its just that they usually don’t know about it or even how to! :]</p>

73

<p>oh in binompdf…how do you know when to put the exact number or a number less for the third number…i always get confused on that…</p>

74

<p>Parameter
Assumptions&Conditions
Name Formula and Interval
Interval Calculation
Conclusion</p>

<p>Parameters
Hypothesis
Assumptions&Conditions
Name Test
Test Statistic
Obtain P-Value
Make Stat Significant Decision
Statement/Conclusion</p>

75

<p>thanks so much, that is really helpful</p>

76

<p>for a large SRS, l. 19-30 in state of CO as survyed, hat generalations of the following populations can the results of survey be safely generalized…
how come it is just 19-30 living in co, instead of ages 19-30 living in state of colorado who were in this survey?</p>

77

<p>I think its cause Confidence intervals are used to predict the mean for the population ( mean/proportion).</p>

78

<p>did anyone else find that test that miracleboy just gave on page 5 ridiculously easy?</p>

<p>i only got 3 wrong on that test, but on the other exams from recent years i usually get at least twice or three times as many wrong…</p>

79

<p>i know this is rather easy, but i can’t remember.how do you find the median of a graph/chart?..also, how do you find standard deviation when you don’t have the list of numbers…just numbers and %…</p>

80

<p>Guys i found the audit- </p>

<p><a href=“http://www.kent.k12.oh.us/~ke_bmccombs/apstatsl/Exam%20review/2008%20released%20exam.PDF[/url]”>http://www.kent.k12.oh.us/~ke_bmccombs/apstatsl/Exam%20review/2008%20released%20exam.PDF&lt;/a&gt;&lt;/p&gt;