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47 Cards in this Set
- Front
- Back
Which hypothesis {Ho or Ha} are we trying to prove in a HT? |
Ha |
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If we have better evidence for Ha than for Ho, does that mean that Ho will probably be rejected? |
no |
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If Ho is true what is the probability that you will reject it by mistake? |
|
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If Ho is not true what is the probability that you mistakenly not reject it? |
unknown |
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What is the total area of the rejection region in a HT? |
|
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If you mistakenly reject Ho, what type of error is it? |
type I |
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If you mistakenly don’t reject Ho, what type of error is it? |
type II |
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What is the chance of making a type I error? |
|
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What is the chance of making a type II error? |
unknown |
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What is the notation for the significance level? |
|
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What is the notation for the total area of the rejection region? |
|
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Generally speaking which type of error is more important to keep small? |
type I |
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At the beginning we always assume what about Ho? |
it is true |
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The pictures we draw in a HT show how the sample statistic would be distributed assuming __________. |
Ho is true |
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The pictures we draw in a HT show how ___________ would be distributed assuming Ho it true. |
the sample statistic |
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The edge(s) of the rejection region(s) are called what? |
critical values |
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Are the critical value(s) found by a table or calculation in this class? |
table |
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The standardized number of the statistic(s) related to the parameter(s) in Ho is called what? |
test statistic |
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Is the test statistic found by a table or calculation? |
calculation |
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What is the p-valuein everyday terms? |
assuming Ho is true it is the chance of findingas strong or stronger evidence than we got that Ho is not true |
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In a right-hand tail the p-value is the area to the ________ of the test statistic. This is because this area represents the chance of getting stronger evidence against Ho, assuming Ho is true. |
right |
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In a right-hand tail the p-value is the area to the right of the test statistic. This is because this area represents the chance of getting _________________ evidence against Ho, assuming Ho is true. |
stronger |
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In a right-hand tail the p-value is the area to the getting of the test statistic. This is because this area represents the chance of getting stronger evidence against Ho, assuming Ho is _______. |
true |
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In order to reject Ho, the p-value must be what compared to the significance level? |
less |
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Which casts more doubt on Ho, a small p-value or a large p-value? |
small |
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Gosset came up with the t distributions by trying to make what product have a high quality? |
beer |
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Suppose you have a large sample and use z in place of t will the difference be that noticeable? |
no |
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Suppose you have a small sample and use z in place of t will the difference be that noticeable? |
yes |
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What is the area under a t curve? |
1 |
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What distribution is a t with an infinite degrees of freedom? |
z |
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When using the z or t why do we not really care about the normality of the data for large sample sizes? |
Central Limit Theorem |
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40 |
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t with 15 degrees of freedom |
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For HTs and CIs for comparing means from two independent samples, if you knew the population standard deviations what distribution would you use? |
z |
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When comparing two means, we use what arithmetic operation to compare them? |
subtraction |
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What is the notation for the sample proportion? |
p’ |
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What is the notation for the population proportion? |
p |
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If the data is random what is the best guess for p? |
p’ |
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To figure the sample size, n, needed for a CI for a proportion, you are safe to use p and q to be ______, this makes n the largest and if n is too large then the margin of error will be even smaller than what was asked for? |
0.5 |
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To figure the sample size, n, needed for a CI for a proportion, you are safe to use p and q to be 0.5, this makes n the largest and if n is too large then the margin of error will be even _________ than what was asked for? |
smaller |
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To figure the sample size, n, needed for a CI for a proportion, if you have a reasonable valuefor p’ and use it then you CI mayhave a margin of error a little too big, but your sample size will be ________making collecting the data easier. |
smaller |
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Suppose p= .40. What is the approximate shape ofthe distribution of p’ for samples ofsize 200? |
normal |
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Suppose p= .40. What is the mean of thedistribution of p’ for samples ofsize 200? |
.40 |
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Suppose p= .40. What is the standard deviation ofthe distribution of p’ for samples ofsize 200? |
|
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When comparing two proportions, we use what arithmetic operation to compare them? |
subtraction |
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Are the t distributions symmetric? |
yes |