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Stat - Quarter 3 topics
Stat - Quarter 3 topics
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1
What theorem says when n is large, the sampling dist. of the sample mean is approx Normal?
The pythagorean theorem of statistics
The central limit theorem
The SRS theorem
2
An estimator is the sample statistic used to estimate a population ___________________.
proportion
mean
parameter
median
3
Determine the power of the following significance test.
92
17.3
8
82.7
4
Determine whether or not the conditions for using two-sample t procedures are met.
Cannot be determined
Yes
No
5
What is a "fake" treatment that is sometimes used in experiments called?
control
simulation
placebo
6
The sign in the alternative hypothesis in a two-tailed test is always _________________.
equal to
greater than
less than
not equal to
7
True or False: A statistically significant difference need not be pratically important.
False
True
8
What deliberately imposes some treatment on individuals to measure their responses?
Survey
Control group
Experiment
Observational study
9
What is it called when the standard deviation of a statistic is estimated from the data?
range
standard error
parameter
variance
10
A type II error is _______________________________________ .
Rejecting the null hypothesis when it's false
Rejecting the null hypothesis when it's true
Failing to reject the null hypothesis when it's false
Failing to reject the null hypothesis when it's true
11
A t-distribution must be used ______________________.
when doing inference with proportions
at all times
when σ is not known
12
To standardize a value, subtract the __________ and divide it by the standard deviation.
median
mode
mean
z-score
13
True or False: Events A and B are independent if P(AΙB) = P(B).
False
True
14
Test scores of 16 kids have a standard deviation 20. What is the standard error of the mean?
20
1
10
5
15
What error is this statistician making?
None, this is a reasonable conclusion
Extrapolating the data
16
Which of the following actions will increase the power of a one-tailed t-test for a mean?
Increase the sample size
increase the probability of a Type II error
decrease the significance level
17
Other things being equal, the margin of error of a confidence interval gets smaller as ...
the confidence level C increases
the point estimate decreases
the sample size n increases
18
What is a measure that is relatively unaffected by extreme observations?
resistant
residual
biased
outlier
19
For any two independent random variables X and Y, the variance of X-Y is __________________.
σ2x
σ2x+σ2y
σx+σy
σ2x-σ2y
20
Was the newly discovered poem by Taylor in 85 published in The Complete Works of W Shakespeare?
Yes
No
21
The large counts condition is needed to make sure that _____________________________________.
we can make inference regarding the larger population
individual observations are independent
a sampling distribution is approximately normal
22
What measures the direction & strenth of a linear relationship between 2 variables?
sx
residual
slope
correlation
23
For any two random variables X and Y, the mean of X-Y is _____________.
µx+µy
µx
µx-µy
µy
24
A test of significance produces a p-value of .03. Which conclusion is appropriate?
Accept Ha at the .01 alpha level
Reject H0 at the .01 alpha level
Fail to reject H0 at the .05 alpha level
Reject H0 at the .05 alpha level
25
When subjects aren't randomly selected, researchers cannot _____________________________.
draw cause & effect
generalize to a larger population
make any conclusions
26
True or False: P(A and B) = P(A) ∙ P(BΙA)
True
False
27
What % of the observations fall within 1 standard deviation of the mean in a normal dist.?
68
34
95
99.7
28
What is z* for a 95% confidence level?
3
1.645
2.58
1.96
29
What is the probability of a Type I error?
beta
p-value
z-score
alpha
30
What does the p hat stand for in this formula?
p-value
test statistic
Pooled sample proportion
population parameter
