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Estimation MCQ

A sample statistic used to estimate the exact value of a population parameter is point estimate

True

False

Answer

Correct Answer: True

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The radius of a confidence interval is margin of error

True

False

Answer

Correct Answer: True

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A process whereby we select a random sample from a population and use a sample statistic to estimate a population parameter is called

Estimation

Confidence interval

Confidence level

None of these

Answer

Correct Answer: Estimation

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The likelihood, expressed as a percentage or a probability, that a specified interval will contain the population parameter is known as

Estimation

Confidence interval

Confidence level

None of these

Answer

Correct Answer: Confidence level

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_____ range of values defined by the confidence level within which the population parameter is estimated to fall.

Estimation

Confidence interval

Confidence level

None of these

Answer

Correct Answer: Confidence interval

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Which of the following is a way to reduce risk of being incorrect?

Decreasing the confidence level

Increasing precision

Increasing the confidence level

Decreasing the standard error

Answer

Correct Answer: Increasing the confidence level

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To calculate a 95% confidence interval, a Z score of ______ would be used.

2.58

1.96

1.65

Answer

Correct Answer: 1.96

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Calculating the standard error of the mean, deciding on the level of confidence, and finding the corresponding Z value are steps involved in ______.

Interpreting the results

Calculating the confidence level

Estimating the sample mean

Determining the confidence level

Answer

Correct Answer: Determining the confidence level

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Suppose that a sample mean is 0.30 with a lower bound of a confidence interval of 0.28. What is the upper bound of the confidence interval?

0.25

0.33

0.30

0.03

Answer

Correct Answer: 0.33

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What two quantities are needed to estimate the standard error of the proportions toward the further estimation of confidence intervals for proportions?

Population mean and population standard deviation

Sample mean and sample standard deviation

Sample proportion and sample size

Population proportion and population size

Answer

Correct Answer: Sample proportion and sample size

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The precision of a confidence is positively associated with the ______.

Level of confidence

Size of the sample

Number of intervals

Margin of error

Answer

Correct Answer: Size of the sample

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The sample standard deviation is used to estimate the ______.

Standard error

Sample mean

Population mean

Margin of error

Answer

Correct Answer: Standard error

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A wider confidence interval will increase ______.

Precision

Confidence

Accuracy

Error

Answer

Correct Answer: Confidence

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Under which of the following conditions will we increase the precision of a confidence interval?

Increasing the level of confidence from 95% to 99

Decreasing the level of confidence from 99% to 95%

Increasing the level of confidence from 68% to 99%

Keeping the level of confidence constant at 95%

Answer

Correct Answer: Decreasing the level of confidence from 99% to 95%

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About 68% of all random sample means fall within ______ standard errors of the true population mean.

±2.58

±1.96

±1.00

±9.90

Answer

Correct Answer: ±1.00

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According to the normal distribution, about 99% of all random sample means fall within ______ standard errors of the true population mean.

±2.58

±1.96

±1.00

±9.90

Answer

Correct Answer: ±2.58

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According to the normal distribution, about 95% of all random sample means fall within ______ standard errors of the true population mean.

±1.96

±1.00

±2.00

±2.58

Answer

Correct Answer: ±1.96

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______ sample sizes produce narrower confidence intervals.

Larger

Smaller

Probability

Nonprobability

Answer

Correct Answer: Larger

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Estimation of population proportions is ______ similar to the estimation of population means.

Conceptually

Operationally

Symbolically

Truly

Answer

Correct Answer: Conceptually

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A point estimate is a sample statistic that provides an exact value of what a ______ might be.

Population parameter

Population statistics

Sample parameter

Sample statistics

Answer

Correct Answer: Population parameter

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