Section A. Identification of Version (1) and True/ False (216)
1.
You are writing
version 1
of this exam.
Indicate this by answering
a
for question 1
.
You MUST do this
correctly.
Discrepancies will be investigated as possible attempts at academic dishonesty.
2.
If a confidence interval is calculated from a sample of 20 from normal distribution with unknown variance, the
degrees of freedom used in calculating the interval is 20.
3.
The word "confidence" in "confidence interval" refers to the proportion or percentage of the time such
intervals encompass (enclose) the parameter being estimated.
4.
Point estimates are, by themselves, an estimation method entirely equivalent to (are a substitute for)
confidence intervals if the standard deviation of the population is unknown.
5.
An unbiased estimator for a parameter of a distribution is an estimator that has an expected value equal to the
parameter being estimated.
6.
The probability that a t value with 20 degrees of freedom will be greater than .25 is .687.
7.
A t interval is used when estimating the mean of a normal distribution with an unknown standard
deviation.
8.
The hypothesis test H
0
: π=
.5 versus H
1
: π =.8 is a "right tailed" test
9.
A t distribution with infinite degrees of freedom is a Z distribution
10.
A type II error occurs when we don't reject a null hypothesis that is false.
11.
A t interval is used in estimating the population proportion if π is unknown.
12.
A point estimate is always at the center of a Z interval, but this is not necessarily so for a t interval.
13.
A simple hypothesis refers to a single value of a parameter of a process or a distribution.
14.
The statement H
0
:
= 40 is a valid simple null hypothesis.
15.
The value that separates the rejection region from the nonrejection region is called the critical value.
16.
A parameter is a quantity computed from sample data and is used in deciding whether to reject the
alternative hypothesis.
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View Full DocumentB. Multiple Choice  basics (1731)
NOTE:
i)
Round your answer to match numbers in choices
ii)
When reading tables, do not interpolate. For example, round your normal deviate 2.913 to 2.91 to
match the available digits in the table.
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 Spring '10
 Buchanan
 Normal Distribution, Statistical hypothesis testing, a. b. c., b. c. d., C. D. E., zcalc

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