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Estimation & Confidence Intervals Flashcards | StudBud
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Estimation & Confidence Intervals
Estimation & Confidence Intervals
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Math 237 - Chapter 6 MATH231 - Chapter 9
Flashcards
11 cards
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Questions
11
Answers
1
The test statistic for problems involving any
n
& an unknown population θ is the z-distribution
False
True
2
A confidence interval is narrower when the sample size __________________.
increases
is wider
decreases
is narrower
3
A sample of metabolites in a sample has mean 491 and SD 119 (ppb). Which one is the 95% C.I.?
431.1, 550.9
372, 610
253, 510
431.9, 550.1
4
The pop. variation measured by the SD has little or no effect on the sample size.
True
False
5
When a confidence interval for a population mean is constructed from sample data, we can infer
that we cannot make any inferences
that μ is in the interval
that μ is not in the interval
that μ is in a stated percentage of the intervals
6
A confidence interval for a population mean
estimates a likelihood or probability
estimates a likely interval for a population mean
estimates the population standard deviation
estimates the population range
7
The t distribution is similar to the z distribution in all BUT one of the following. Which one?
t distribution's mean = 0 and standard deviation = 1
Symmetrical
Bell-shaped
Continuous
8
A confidence interval for a pop. proportion uses uniform dist. to approximate the binomial dist
True
False
9
What kind of distribution is the t distribution?
Subjective
Discrete
Continuous
z distribution
10
When we use a confidence interval to infer about μ, we are applying a type of reasoning called
descriptive statistics
graphics
statistical inference
the normal distribution
11
A point estimate is a single value used to estimate a population parameter.
True
False
