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The value(s) assigned to a population parameter based on the alue of a sample statistic is called ____________.
The sample statistic used to estimate a population parameter is called __________.
A __________ is a single value (or point) used to approximate a population parameter.
An interval constructed around the value of a sample statistic (point estimate) to estimate the corresponding population paramter is the _______________ or __________.
- confidence interval
- interval estimate
A ______________ is a range or interval of values used to estimate the true value of a population parameter.
The ____________ is the probability
that the confidence interval actually does contain the population parameter. It is also called the ________ or the _____________.
- confidence level
- degree of confidence
- confidence coefficient
When interpreting a confidence interval which is correct to say:
1. "there is a 95% chance that...."
2. "We are 95% confident that the interval..."
What is a number on the borderline separating sample statistics that are likely to occur from those that are unlikely to occur?
The number _____ is a critical value that is a z score with the property it separates an area of _____ in the right tail of the standard normal distribution.
The difference between the sample proportion and the population proportion can be thought of as ___________
Margin of Error E
What are the requirements to construct a confidence interval for estimating a population Proportion P and how is the confidence interval found?
- 1. Requirements:
- - sample is a simple random sample.
- - conditions for the binaomial distribution are satisfied.
- 2. Confidence interval
The confidence interval is often expressin in the what equivalent formats?
When analyzing results from polls, what four things should be considered?
- 1. sample should be a simple random sample.
- 2. confidence level should be provided.
- 3. sample size should be provided.
- 4. Except for relatively rare cases, quality of poll depends on sampling method and size of the sample. population size is usually not a factor.
How is the sample size determined in order to estimate the population proportion p?
1. when an estimate
2. when an estimate
is not known?
3. What is the round-off rule for determining sample size?
- 1. whan an estimate is known:
- 2. when an estimate is not known:
3. If not a whole number, round the value of n
up to the next larger
If the confidence interval limits are known,
1. how is the point estimate of
2. How is the Margin of Error found?
= [(upper confidence interval limit)+(lower confidence interval lmit)]/2
E=[(upper confidence interval limit)+(lower confidence interval lmit)]/2
How is the confidence interval or estimating a population mean (with
What is the round-off rule for confidence intervals used to estimate
When using the orginal set of data
, round to one more decimal place than is used for the original set of data.
When the original set of data is unknown, only
, is used, round to the same number of decimal places used for the sample mean.
How is the sample size required to estimate a population mean found?
How is a Sample Size with unknown
1. use range rule of thumb
2. Start sample collection process, using the first several values, calculuate the sample standard deviation s and use it in place of
3. Estimate by using results of some other study done earlier.
The difference between the value of a sample statistic obtained from a sample and the value of the corresponding population parameter obtained from the population is called the ______________.
A ______________ are errors made during collection, recording, and tabulation of data.
The sampling error is the difference between the value of a _____________ and the value of the corresponding population parameter.
Sampling error =
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