Biology Forums - Study Force

If the sample mean is used to estimate  and a maximum error of estimate is specified, then n may be determined for a known standard deviation and a given level of confidence. If the maximum error of estimate is doubled, what is the affect on the required sample size?

Q. 2

For any distribution, if the mean is equal to the standard deviation, you can infer that the distribution is symmetric.
  Indicate whether the statement is true or false

Q. 3

Discuss the difference between a point estimate for a parameter and an interval estimate for a parameter.

Q. 4

The value (n + 1) / 2 indicates the value of the median in an ordered data set, where n is the number of data values.
  Indicate whether the statement is true or false

Q. 5

Which of the following statements is false?
 a. The confidence interval has two basic characteristics that determine its quality: its level of confidence and its width.
  b. It is preferred that the confidence interval has a high level of confidence and be precise (narrow) at the same time.
  c. When we solve for the sample size n, it is customary to round down to the next larger integer, no matter what fraction (or decimal) results.
  d. None of the above

Q. 6

You are given the data values 5, 10, 15, 20, and 25 . If these data were considered to be a population, and you calculated the mean, you would get the same answer as if these data were considered to be a sample from another larger population.
  Indicate whether the statement is true or false

Q. 7

When estimating a population mean with a confidence interval estimate, then E is:
 a. equal to the level of confidence.
  b. one-half the width of the confidence interval.
  c. a multiple of the population mean.
  d. a multiple of the population standard deviation.

Q. 8

For distributions of data that are skewed to the left or right, the median would likely be the best measure of center.
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Q. 9

A point estimate for a parameter is a single number designed to estimate a quantitative parameter of a population, usually the value of the corresponding sample statistic.
  Indicate whether the statement is true or false

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