- The sampling frame is the
- desired population from which the sample should be drawn
- actual population from which the sample is drawn
- desired population from which the sample is drawn
- actual population from which the sample should be drawn
- The formula for the normal curve
- is unknown
- contains a squared mean deviation score
- requires many lines for which to express its complexity
- is based on both the sine and cosine function
- If a normally distributed population has a mean of 50 and standard deviation of 10, about what percentage of values are between 40 and 60?
a. 100 b. 680 c. 340 d. 990
- Reporting a margin of error about a sample mean is an example of a
a. hypothesis test b. confidence interval c. sample statistic d. random simulation
- What is the probability that a randomly selected value from a normal distribution has a standard score larger than 5?
a. 0.000000287 b. 0.500000000 c. 1.000000000 d. 0.028700000
- For a normal distribution, the mean must be _____ and the standard deviation must be _____.
- B. negative, zero or positive; negative, zero or positive;
- positive; positive
- negative, zero or positive; positive
- positive; negative, zero or positive
- If many samples were taken,
- sampling variation would diminish
- a procedural error has occurred
- then a different value of Y would be observed for each sample
- the population mean would demonstrate variability
- The primary difficulty in obtaining the true population values, such as for the population mean, is
- lack of funding
- lack of understanding of statistical principles
- improper computer analysis
- random fluctuation
- A population value is
a. known b. unknown c. directly calculated d. of secondary interest
- If a given distribution has a mean of 50 with an SD of 5, a score of 65 could be represented by "z" =
a. -2 b. +1 c. +3 d. +2